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Everything posted by Saint 1
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Thanks PDB. Up to now I've not found anything better than EvoStik for bonding PLA to Correx. And thanks for the PETG recommendation, I'll have a look into that. I'm new to 3D printing so still have much to learn regarding materials. All the best, Phil
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Looking forward to seeing this progress Phil.
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Following on from my recent Impala project I decided to experiment further with the incorporation of 3D printed parts within my Correx builds. My second ever Correx build was a Trevor Stroud Hawk T1 which I painted in Red Arrows colours and it’s easily racked up more flying hours than any of my other builds to date, and had the scars to prove it! So I felt it was time to build a new PLA-enhanced replacement. The plan was to still use Correx for the main wing and fuselage skins but 3d printed parts for the trickier compound curves that Correx doesn’t do well and anywhere else where an aerodynamic or cosmetic improvement might be made. I started with the anhedral tail section; the fuselage skins always required some filler at this point and the anhedral linkage assembly was tricky to create and assemble with any kind of accuracy. I thought if I could produce this in PLA then everything else should be relatively straightforward. It took a few design iterations but eventually I had the rear end section modelled in Cad and printing reasonably well. The front end has a location spigot to the same dimensions as former F6, the rear has an oversized hole to enable access to tighten the control rod linkage fixings. I incorporated internal bracing within the design in order to support the 4mm carbon tailplane rods plus a slot along TDC to accommodate the tail fin. I printed an exhaust cover to blank the access hole off and a pair of levers with M3 brass threaded inserts heat-set in place. To improve the aerodynamics I wanted to try making all the tail surfaces in either PLA or LWPLA too. After many trial parts experimenting with various infill types and densities I eventually settled on using PLA for the tailplane surfaces and LWPLA for the fin. (I forgot to take a photo of the fin at this stage). I modelled and printed the nose and all the remaining formers. The nose, F1, F3 and F5 were all printed in PLA for strength, the remaining F2 and F4 formers were printed in LWPLA. Whilst I was at it I revised the side profile of the nose from that shown on the plans to give it a more scale-like droop. I printed a servo tray in LWPLA to fit against F4. And once again I used brass heat-set inserts (M5 this time) for the nylon wing mounting bolts at F5. Having printed the nose and tail sections the remaining centre section of Correx fuselage skin was simple to roll around and glue to the formers. On traditional Correx builds the skin would ordinarily be hot-glued in place but I found that wasn’t possible here since the heat would melt and distort the PLA. Similarly the use of acetone was also best avoided so it was EvoStik pretty much everywhere for this particular build. In an attempt to add as much detail as practical I decided to introduce the two fins on the underside of the rear fuselage. I wasn’t sure anything in PLA would be robust enough in this location so chose the tried and tested method of using ply with a supporting piece of balsa on the fuselage inner skin. Due to size constraints of my printer I had to make the tail fin in 3 parts and as with my previous builds I chose to incorporate a 2.5mm carbon rod within it for extra rigidity. I had previously carved the side air intakes from balsa but once again I was able to model and print these in LWPLA. Trying to shape the underside to fit neatly against the Correx wing proved the most challenging part. I created some instrument binnacles and a couple of air intakes in LWPLA and subsequently a representation of an ejector seat too. I don’t have the skillset or software to model pilot figures so I purchased and downloaded one of Max Greuter’s excellent figures off CGTrader. One further piece of detail on the rear of the fuselage was the smoke injectors. I bent these from piano wire and glued them into another detail part I had printed previously. Here they are, trial fitted, still to be cut down to final size. All of the 5 Hawks I had built to date utilised Trevor Stroud’s version 2 wing which had a reduced spar depth and a straight rather than swept trailing edge. Trevor found that his original wing design didn't perform to his satisfaction. This time I have opted to build a wing half way between the two designs. For a more scale-like appearance I have chosen to build his original swept trailing edge version but incorporated the reduced spar depth of the version 2 wing. I gave some considerable thought as to whether I could somehow use PLA to create an improved aerofoil leading edge but couldn’t come up with anything I felt would be robust enough so for now have stuck with the normal folded leaded edge and my method of using balsa and thin ply to close off any open flutes. I did however think there would be opportunity for improvement of the trailing edge. The ailerons are very nearly full length. I thought I could print these in LWPLA to not only be more aerodynamic than a piece of 3mm Correx but also incorporate washout within them too. There was no real science involved here, I just drew something up in Cad that I thought looked right. Still using a conventional 3mm Correx hinge I modelled each aileron to sandwich the hinge and then vary in cross section from being a flat bottomed aerofoil at the inboard end to a symmetrical section at the outboard end. Because the ailerons were so long I had to print each one in 3 parts. I inserted a 2mm carbon rod along the entire length of each aileron to both add rigidity and aid alignment of the 3 parts during the bonding process. I printed the wings forward location tang and matching spacer, as well as a spreader plate for the rear wing bolts plus another servo mount for the aileron servos. Here's a photo of my wing compared to the straight trailing edge version of my other Union Jack Hawk As with the Impala I once again printed a pair of wing strakes but decided against trying to add all the other underside strakes as I thought they would be too vulnerable on landing. Something else I thought might be too vulnerable was the underside tank but I had a go at modelling and printing it and was surprised at just how strong it seemed to be. I made it from PLA in three parts with carbon rods inserted for alignment whilst supergluing together. It’s attached using my normal two nylon wing bolts at the rear augmented by a further nylon bolt towards the front which passes through the lower wing surface and screws in to the wooden support block of the front location tang. Each bolt passes through some bespoke washers that I printed. This bolted arrangement means I will be able to fly my Red Arrow either with or without the tank fitted, should I wish. In all there are 54 individual printed parts, some of which were printed in a matter of minutes, many taking several hours so it was quite a lengthy process all told. After prepping the balsa parts with thin cyano I sprayed a clear plastic primer over everything followed by an acrylic white primer. Once again, using Lifecolor Mimetic Paints, I sprayed the matt red, then using a combination of masking tapes and film sprayed the matt white stripe and white and blue of the Union Jack tail. The ‘Royal Air Force’ lettering and the Union Jack flag colours on the tail were masked using Artool Ultra Mask cut using a Cricut vinyl cutter. The remaining decals were produced by waterslides or cut vinyl. Once all the decals were in place I then applied a few coats of aerosol clear gloss acrylic As with all my previous Hawk builds the canopy was made from two 2 litre pop bottles, joined under the sand-coloured section of the canopy frame. Prior to painting the AUW was just 1225g, including the fuel tank which accounted for 82g. Fully finished after all the paint and vinyl this figure increased to an AUW of 1382g, very much on par with my previous all-Correx Hawks and considerably less than the 1790g of my previous Impala! And once again my super-talented wife made me a bespoke travel bag to keep it looking its best. I’ve flown my Red Arrow a number of times now, most recently at the PSSA event on the Lleyn Peninsula in North Wales. It flies noticeably faster than my regular all-Correx Hawks which I’m putting down to a combination of the swept trailing edge and improved aerodynamics of my ailerons and tail feathers. Thus far I’ve not encountered any tip stalling either so hopefully my inbuilt aileron washout has helped in that department. I’ve only encountered two problems to date. The first being a slight loss in clamping force on one of my tailplane control arms causing a misalignment between the two tailplanes. I think the PLA had slowly compressed over time causing the loss in clamping force and enabling the lever to rotate on the carbon rod. I have since fitted larger washers to help spread the load which seems to have done the trick for the time being but I may print some new levers with a higher infill density or maybe even solid. The second problem is more a cosmetic one. Making my cockpit instrument binnacles in LWPLA, painting them black, enclosing them within a clear canopy and then leaving them out on a sunny slope all day is not a good idea it seems. I’ll live with the deformation for now, maybe regular PLA might be a better option in the future and keeping the canopy covered on hot days. Thanks to Phil Cooke for this final photo of me with my Red Arrow on the Lleyn Peninsula in North Wales.
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Not sure my skills are quite up to formation flying but that would be good Andy thanks
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I maidened my Impala at the Orme last weekend too! Despite her hefty 1.8kg AUW she flew brilliantly from the off with virtually no trimming. With how windy it was I did have some reservations that the air intakes or tip tanks might have blown off in flight but they were unfounded. Both intakes did detach on landing though but that was the idea. I'll be looking forward to flying her again soon. Last minute checks - Photo courtesy of Dave Gilder:- And away! - Photo courtesy of Phil Cooke.
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Just realised I had not added any in-flight photos of my Super Corsair. The first was taken by Phil Cooke at the Orme last October And these next two were taken by Dave Gilder, again at the Orme, last weekend She is a delight to fly and one of my favourites.
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It's taken quite a while but finally I was able to maiden my Sea Hawk at last weekend's PSSA meet at the Great Orme. The launch went well (thanks to Harry Twist) and she was soon climbing away, in fact I had to feed in a considerable amount of down trim in order to maintain level flight but much of that may have been attributable to the strong winds we had over the course of the weekend. I did find it to be quite sensitive in both pitch and roll for my liking but managed to limit that with my rate switches. I didn't get to attempt a proper landing because I had a moment of complete disorientation and ended up making an enforced belly flop landing into some gorse. Amazingly no damage was incurred other than a broken pitot tube! I was VERY lucky! Since returning home I revisited my CG calcs and found an error meaning my CG was further back than I thought at around 7% static margin so I have now added another 50g in the nose to bring it forward by 10mm and giving a 10% margin. Hopefully that will make it a little less twitchy in pitch for next time. I have also upped the expo on the ailerons and elevator too for good measure. Hopefully we'll have favourable conditions for our return to the Orme next month and I'll get to fly her again Here's a couple of photos for the record: Launch photo courtesy of Phil Cooke:- In-flight photo courtesy of Dave Gilder
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Very nice job Mike, just needs some wings and tail feathers and you'll be done 😁
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Thanks for the kind comments all. Stu: I've sent you a pm.
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I've finally managed to finish off my Impala, the weather hasn't been very conducive to spraying so there has been the need for much use of the fan heater and hot air gun to help things along, my impatience doesn't help of course! I chose to replicate the colours of a recently restored Italian Air Force MB-326K Impala - registration I-MBCK. I had never attempted spraying camouflage with faded edges before so this was a bit of a new adventure for me. Fortunately, Harry Twist pointed me towards using soft edge masking foam which helped no end and although the masking process took quite a while I'm very pleased with the results. I once again used the Lifecolor Mimetic range of paints from Airbrushes.com. The rest of the detailing is a mixture of vinyl and waterslides and in some places waterslide on top of vinyl. The whole model then had a couple of coats of clear satin sealer to finish off. It turns out that paint and vinyl are heavy, adding another 140g to the finished weight so I probably now have the heaviest Correx Impala ever built at 1790g! That aside, with all the added 3d printed parts and detail I reckon from 6 feet away anyone would now be hard pushed to recognise its humble Correx origins. I'm now really looking forward to getting her maidened... when there's a stiff breeze blowing!
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Thanks PDB. That's a very good question. Correx is tricky to get a decent bond to as you say. On surfaces that aren't seen I first key the bond area with sandpaper, then clean all surfaces with nail varnish remover. In my experience wherever possible hot melt glue gives the best bond, followed by EvoStik. When using EvoStik to glue on my balsa edging strips though it has sometimes had some kind of chemical reaction within the flutes and caused the skins to bubble up slightly. As an alternative I have now found that clear Gorilla glue also works reasonably well when bonding to the flute edges. It's not as good as EvoStik when bonding directly on the surface of the Correx though, as I found when gluing my printed wing strakes. I first bonded these with Gorilla glue but then managed to dislodge one so have now reverted to EvoStik again! I have had similar problems with filler. It's ok to use when filling joint gaps where it has good edges to get a grip on but it never adheres as a thin slither over surfaces very well and would invariably flake off after a heavy landing.
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Building my Correx planes to look more scale takes on a new dimension. I thought I’d share a few photos and info on another Correx build I have been working on over the Winter, but this one's a little different for me. As you may know already I have built quite a number of Correx PSS aircraft over the past four or so years and over that time have gradually attempted to transform them from the normal vinyl covered 'fun' plane to something a little more scale in appearance and worthy of gracing the skies alongside more traditionally built planes at our PSSA events. This time I decided to turn my attention to the Aermacchi MB-326 Impala. There is something about planes with tip tanks that just seems to make them look so good in the air. The plans for this particular model have been about for years and are freely available to download, along with many others, from RCgroups.com https://www.rcgroups.com/forums/showthread.php?1445391-Correx-PSS-L39HawkF-18FoxxU-2ImpalaA-10SpitfireF4USeaFuryP-51VulcanFW190-free-plans! The construction method has been covered many times before so I won’t go into detail on that. My build is already complete and now ready for a primer coat. The build was mostly to plan other than my usual approach of using 2.4mm ‘Correx’ for the wings rather than 2mm plus a few adjustments along the way to fuselage former sizes and positions to aid assembly. In my more recent builds I have taken to closing off any exposed flutes to improve the look, either with thin ply, balsa or filler and that is what I have done again here. I have also produced the ailerons with a folded piece of Correx rather than just a single 3mm thickness: this not only reduces the amount of exposed flutes but also makes for a smoother blend between the wing and aileron surfaces. The nose is made from a ply cruciform with balsa infill. When I first commenced this build knew I would want to improve on the tip tanks; to plan they are simply made from a few thicknesses of Correx glued together. Plus there were no air intakes either – something else I wanted to add. These were invariably going to be produced in balsa BUT then, mid-way through December I was offered a second-hand 3d printer – something I had been thinking about for some time..... My builds are never going to be the same again! Much of my past career revolved around Cad modelling so before long I found myself downloading some free Cad software and although it was a different package to that I’d been accustomed to I soon got back into the swing of things again….and then there was no stopping me! The tip tanks are HUGE – 400mm long! But after a fair few iterations I had something that fitted neatly over the ends of my Correx wings. For retention I included holes to accommodate both 6mm and 8mm magnets, in case the 6mm ones aren't strong enough. My first attempts were printed flat on the bed and had way too much infill and consequently weighed well over 100g each. After much help and advice from Tim Mackey (Thanks Tim!) I ended up printing the tanks vertically with thinner walls and a much reduced level of infill. This not only produced a far better surface finish but also reduced the weight by more than half, down to a little over 50g each. This was using PLA+ print filament. A test performed by Tim suggests this weight could be further reduced by another half again if lightweight LWPLA were to be used. For now though I’m happy with what I have. With the tanks sorted my next challenge were the air intakes. I opted to make each one in two pieces; a lower piece which I bonded to the underside of the wing with the upper piece held in place by yet more magnets. My thinking here is that the upper pieces will easily detach, should the wing bolts ever shear and cause the wing to twist out of the fuselage, rather than directly impacting the fuselage sides. These weighed a little over 60g for the pair which didn’t seem too bad. A part-pilot and seat added another 20g The particular Impala I’m modelling had cannons so I decided to have a go at modelling and printing some of those too. Trying to create the correct shape to mate to the underside of a folded Correx fuselage proved quite challenging but I eventually had something that fitted reasonably well and weighed in at around 35g for the set. I made a pair of wing strakes which weighed in at under 5g and also made a little instrument binnacle to suit a photo of the instruments I found. This weighed just 6.5g Another feature of the plane I’m modelling is what I presume is some kind of aerial – a hoop-like structure on the tail fin. Recreating this would invariably result in something exceedingly prone to damage in transit so I wanted to make something which was detachable. I ended up modelling some tiny grommet-like pieces that will be glued together sandwiching the tail fin and with suitably sized holes to accommodate some black wire sleeving (with the wire stripped out from inside). A trial piece suggests it should work. Adding all these detail parts (and filler) of course comes with a weight penalty, something in the region of 250g for this build, taking a more normal build up from around 1400g to where I am now at 1650g (fully balanced to the plan CG point and including 50g of nose weight but without paint). Hopefully it’ll all be worth it though! Here are a few more photos of the whole plane as it is currently. Thin ply and filler used to cover any exposed flutes around the exhaust (Not the best place to be adding weight admittedly). Filler applied at the joint between the turtle deck and fuselage Thin ply edging of exposed flutes and 6mm x 2mm magnets to retain the tip tanks...hopefully! Predominantly balsa edging strips around all tail surface edges. Also visible are 2.5mm carbon stiffening rods inserted through the flutes. Those within the fin penetrate down through the fuselage formers for extra rigidity. Hopefully it'll soon warm up and I'll be able to make a start on getting it primered and ready for the finished colours Phil
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😄 Thanks John. PSS... it's quite an addiction isn't it, there's rarely a day, or night even when my mind isn't given over to some random thought relating to it. Even my wife won't throw anything away without first asking "might this be any use to you for one of your planes?". Some have it far worse than others mind, as yet I've not crossed the Atlantic 'on holiday' just for a tube of glue 😁
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Lovely choice of colour scheme Pete. Looking at Sunday's maiden flight I think I would look at moving the CG rearwards a little if you can, ideally without adding even more weight in the tail. Are you able to relocate any of the radio gear further back at all?
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Once again we had a good time at The Orme last weekend for the last PSSA meeting of the season but I decided against trying to maiden my Sea Hawk so no aerial photos now probably until we return in the Spring I'm afraid. There were good 20+mph winds on the Saturday but being from a North Westerly direction it meant either a tricky landing amongst the rocks and gorse to our left or a lengthy walk up to the top where there is a substantial and flat grass area. I flew my Correx BAe Hawk a couple of times and landed that to the left ok and then later on flew my 1/8 Super Corsair. This time I decided to land up top which was great, once I got there! Thanks to Harry Twist for navigating me around the rocks and getting me there safely whilst still flying. As the afternoon moved on the low sun on the landing circuit became another problem and so I decided not to risk the Sea Hawk. More accomplished pilots than me would and did fly their larger planes and land them without incident but equally there were others that weren't quite so lucky so for better or worse I decided to call it a day. Lack of wind on the Sunday made it virtually impossible to fly any PSS planes so that was it for the weekend. So all I can offer you for now are photos of my BAe Hawk and Super Corsair in action and another of me and my Sea Hawk very much on terra firma. All photos courtesy of Phil Cooke.
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Thanks everyone, Jan is flattered by your comments. You are right Ace in that it wasn't a 5 minute job, more like a week on and off with much head scratching along the way so producing more is not something she would wish to pursue on a regular basis plus there would be a couple of challenges going forward. Firstly there would be the logistics of her needing access to any aircraft model for the duration and then secondly we haven't been able to source any more of the fabric we have used. I bought it from a place selling roll ends, it has a waterproof outer, foam middle and mesh inner all fused together, I presume, being lumo that it must normally be used for some kind of work wear. It is really durable. Despite us asking on a number of occasions up to now they have never had any more come back in stock. Here's a photo of the material so you can see the construction...
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Thanks everyone for the kind comments, hopefully the weather will be good for us at the Orme and we'll get some good aerial shots. I have to share a few photos of the super bespoke protective bags my wife has made to keep it safe in storage and transportation. Now that'll just leave the unsafe bits when I'm at the controls to worry about 😁
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The glossing of the fuselage went as well as I could’ve hoped other than having to dash out and get another spray can part way through so it took three cans in total. The finish is more sheen than gloss but I’m pleased with it nonetheless and I was soon able to assemble everything properly for the first time, fitting the elevators and rudder along with their servos and linkages and installing the radio gear up front. I have been on the final page 22 of the build guide for quite some time. ‘covering and final finishing’ – Just four words but they took 5 weeks to complete! All that remained after final finishing was to set the CG and control surface throws. The CG point as specified on the plans is 40mm forward of the stage 7 former which on my build equated to being 82mm rearward of my wing joint leading edge – marked on my joint face by the pencil line in the photo below. I have used another couple of those soft close cupboard door buffer pads to make for easy location of the CG point on the underside. The CG point looked quite a way forward to me on first inspection but having subsequently used the rcplanes online CG calculator for a 2 panel wing (taking into account the faired sections) it equates to about 12% static margin so probably not a bad starting point for a maiden. (10% margin would move it back by around ¼”). As a check I got in contact with John Woodfield to ask if he could confirm whether or not he had subsequently altered his CG away from the plan figure. Unfortunately he had recently sold his Sea Hawk so couldn’t check for certain but from memory thought he’d started as per the plan and then gradually moved it rearwards so I will likely have to do similar with mine. Achieving the plan CG point meant I needed to add a further 185g of nose ballast over and above the 240g I had previously built into the balsa nose giving me an AUW figure of 3.188kg or just over 7lb, remarkably similar in both size and weight to my Correx Super Corsair. I have programmed in 3 rates settings on my ailerons and elevator with the medium setting matching the specified control throws so for the maiden I’ll have the option of either increasing or decreasing the throws in flight if necessary. So that’s it, all I need now are some favourable conditions on the Orme next month, the nerve to let someone throw it off and hopefully sufficient ability to be able to land it safely again. Thanks to all those who have provided help and advice along the way, especially to Phil Cooke and Harry Twist – sorry for bombarding you both with so many questions. Here’s a few photos of the finished plane along with both my Super Corsair and me for size comparison.
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The sun shone this morning, need I say any more 😁
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You may well be right Andy, but I live in hope. I'll give it a week, failing that I'll be making a temporary spray booth in the garage. I'm sure I still have my school days flexi-curve somewhere, I'll have to dig it out, if it's not perished by now that is 😁
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Thanks for that Andy and thanks for the tip re wet sanding, that’s something I’ll have to consider on any future builds, I’ve not attempted to sand either the sky or grey on this build, they’re both as sprayed (and touched up) prior to me spraying the gloss coat. I’m nearly there with it now, I’ve done all the detailing I intend to and all that remains is for me to spray the gloss coat over the fuselage but the poor weather has now put that on hold until the weekend at least so for now here’s how the rest of the detailing went… I’ve found that marking panel lines on surfaces with compound curves is not the easiest of jobs There are a series of panels over the top of the fuselage, rearwards of the canopy, two banks of six, they open so I presume they are engine related but I don’t know for sure. I marked them out on the fuselage as best I could using tape and then cut a rectangular hole in an old credit card to then use as a template to draw each panel. This went reasonably well barring one or two slips but I got through a number of marker pens in the process. Marking onto the sky colour had previously gone well but the grey colour had dried to leave quite an abrasive finish which I think started clogging the fibre pen nibs. I marked an area to position the four gun ports on the underside of the nose, applied the outermost two vinyl stickers we had made previously and then spaced the other two equally between them. That was a mistake, which I’ll come back to shortly With the gun ports applied I was able to draw the panel line around them and then add the panel retainer holes. I drilled a few holes of varying sizes in the old credit card until I found one that looked about right to me and then placed the edge of the card against some tape to ensure each hole was a consistent distance in from the panel edge. Suitably pleased with the result we went on holiday for a week and whilst we were away I did a bit more researching and realised my gun ports weren’t spaced correctly, so the first job when we returned was to carefully relocate them. I had spaced them equally when in reality there are two each side with a much larger gap on the underside. I managed to rectify things by just relocating the two innermost vinyl stickers without too much drama but then also had to reposition two of the holes as well. I tried using some methylated spirit to remove them which worked to a degree but also spread the ink over a wider area in the process so there was quite a bit of touching up to be done also. So, not the prettiest job but we got there in the end. The undercarriage panels are quite noticeable so I wanted to add those too. It took me an entire morning to mark them out and draw them on, the compound curves of the nose being particularly awkward to draw on to. Again, not perfect by any means but I’m glad I’ve given it a go. I also added the continuation of a flap from the wing. There were a couple more filler cap type features on the top of the fuselage I thought worth adding so with the help of our daughter once more we produced them as waterslides. And that is it for me detail-wise, there are a couple of features protruding on the underside of the fuselage that I have chosen to omit as they would invariably get knocked off on landing anyway. With everything else already glossed I have at least been able to build the wings up by adding the ailerons, servos and servo access panels. I put a smear of petroleum jelly around each Robart hinge pin and then secured the body of each hinge in place with super phatic glue which seems to have worked. Now I just need a nice calm, warm and sunny day to finish coat the fuselage 🙏
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Thank you Harry, it wouldn't have been half as good without all the help and guidance I've received from yourself, Phil and all our fellow PSSA gang along the way and of course reference to the invaluable mine of information to be found in all the past mass build blogs.
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Thanks chaps, I must admit I'm somewhat pleased with how it's turning out too, I know there are bits that aren't perfect but so long as I don't mess up finishing off the fuselage then it should look pretty good when all together 🙂
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Thank you Tosh, I'm no paint expert by any means and am still learning as I go but if my blog gives others some help and inspiration along the way then that's great. A lesson I learnt this time and forgot to mention in my last post was using newspaper for masking the fuselage when spraying the grey was a bad idea. Some of the print transferred itself onto the sky paintwork, I was subsequently able to clean most of it off but some areas needed another coat of the sky to fully restore it. And you're absolutely right, I will be extremely nervous come maiden day, landings have never been my strong point 😄
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I made a few more detail items and once again old biros have proved to be a most useful source for such things I made the small air scoop on the right hand side over the wing from an old pen top, a little bit of filler and a piece of thin ply and then the wing tip pitot probe from a biro inner, which still had some red ink in so that might prove messy should I ever damage it! I also made the two little aerials on top of the fuselage using pieces of snake inners which I made a push fit into some soft close cupboard door buffer pads so like the pitot probe I’ll be able to remove these for transportation. I finally decided where to fit my receiver switch, it’s snug but there’s just room for it behind the ejector seat. It’ll be out of sight but just about accessible with the canopy removed. With everything in primer it was now time to start with some colour. As per Phil Cooke’s recommendation I decided to use Lifecolor paints from airbrushes.com. After some research and from their ‘Mimetic’ range I used UA095 – Sky for the underside and UA516 – Dark Sea Grey for on top, along with the Lifecolor thinner. Six of each colour and a 250ml bottle of thinner proved about right for the task. I used the airbrush and compressor I bought last year for my little Alpha jet build I’ve not had much experience of airbrush spraying, all my previous Correx builds have been finished with rattle cans and/or vinyl so once again I’m on something of a learning curve here. That said it all went reasonably well and before long I had everything painted up in the sky colour. It took 4 or 5 coats to get a consistent even finish. Initially I had been using a 0.2mm spray nozzle but soon found the larger 0.4mm provided much better coverage. At times I was suffering with a gradual build-up of liquid paint in the nozzle which if left unaddressed would then splatter onto the surface I was spraying so found that soaking this away with paper towel every so often would help. I was mixing the paint like for like with thinner so maybe a different ratio would have helped or different pressures, I was spraying at around 20psi. With the sky done I couldn’t resist finishing off the arrester hook and applying some gloss. After some careful masking it was then onto the grey. The grey seemed to cover so much better than the sky had done. The blob on the tail fin was a nightmare to mask. I first masked off the plane and sprayed the whole blob in Tamiya flat yellow after which I then masked off the yellow and sprayed the black. I had a bit of seepage in places so there was quite a bit of touching up required afterwards but it didn’t turn out too badly. And then I masked and sprayed the concave exhaust surfaces in silver too. I finished my pilot and ejector seat off, making his harness straps by folding masking tape back on itself and cutting the required width and then painting. Perhaps he could really do with an oxygen mask and maybe a visor too so maybe I'll have a go at that sometime. I added my instrument photos to the unit I had made previously, after which I was then able to spray and fit the canopy. The Callie graphics vinyls were a delight to apply. I had to cut some of them where they overlapped the servo covers and ailerons. I was a little fearful when applying the fuselage roundel that the opacity of the vinyl might not have been sufficient when bridging between the grey and sky colours but my fears were totally unfounded. The ridge from my masking between grey and sky can be seen but the colours of the roundel are completely unaffected by the fuselage’s colour change. I wanted to add some further detail over and above the Callie graphic vinyls so with some assistance from my daughter in the graphics department we made some additional waterslide decals. I printed them onto clear waterslide paper so their colours got dulled down a bit once applied to the fuselage but they look ok nonetheless. I decided I wanted to add one or two panel lines, something else I've never attempted. I’m not sure quite how far I’ll go with them yet but for now have added a few around the exhaust, the trim tabs on the rudder and elevators and the flaps on the wings. There’s more still to do on the fuselage. Initially I planned on using some water based ink art pens I had since there was a good range of colours to be had but found they didn't mark that well and smudged all too easily so ended up using a black ultrafine Sharpie instead. Before finishing the fuselage and whilst the weather was good and warm I chose to spray a gloss finish over everything else instead. I am using Plastikote clear gloss and will probably break into a third can by the time I’m done. So here we now have a little SHINY kit of parts, all now ready for assembly All that remains for me now is to finish detailing and then glossing the fuselage and I’ll then be able to put it all together, if all goes to plan I reckon I should have a finished plane by the end of the month.
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