John Rickett 102
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Posts posted by John Rickett 102
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Thanks for the support Manish, but I'm not happy with the result, there are bits of black border missing in quite a few places. I've learned a few lessons which is what this hobby is about so hopefully the next attempt will be better.
Jersey Airways Ltd, now mostly obliterated with the latest mask was a success so I'll use those masks without alteration, but then one colour is quite easy, its trying to do multiple colours where one mask has to overlay another when the errors creep in.
People say that you can't see any of it when its in the air, which is true, but all models spend most of the time on the ground and with the eye being naturally attracted to detail the little bits ought to pass muster. If at first you don't succeed......
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Painting the test panel proved to be a frustrating experience. I think anything that could go wrong did, but at least it was better to practice on the panel rather than to commit straight to the airframe.
For a start the black borders are too small at 1mm and don’t provide enough emphasis to the letters, these are 110mm so that’s a less than 1% border. I’d experimented with the dash with a thicker border (2mm) which looks better although I think 2.5mm will be better still. Also, in some places the thin border didn’t adhere sufficiently to the paint below and consequently lifted when the masks were removed. This may be partly due to there been so little surface area to gain adhesion.
There is quite a lot of paint bleed and this on a smooth panel so undoubtably it would be worse on a textured surface. I’ll have to pay greater attention to making sure the masks and any tape are well pressed down.
I hadn’t rubbed down the paint to provide a key as it would have meant that some of the finished white would have shown the scratch marks of keying, and neither did I clean with panel wipe so there could have been greasy finger marks which prevented the masks and paint from adhering.
In painting the juxtaposed colours, starting with a white background, the red letters have to be re-masked in order to spray the black border – getting the masks into a precise position was incredibly difficult. At this point everything is red so there is only the raised edge of the adjacent mask to work to. Increasing the width of the borders will make any location errors less obvious.
Another problem is gauging when to remove the masks, too early and the wet paint flows slightly, later when the paint is dryish but tacky, it tends to leave string marks when lifted. If it’s left to be touch dry there is an edge which doesn’t smooth out. The last leaves the cleanest finish but unless there’s going to be a final clear coat, the paint can’t be rubbed down due to the unsightly marks that remain.
It would have been much easier to just paint black letters but the good news is I like the effect and think it provides a period look. As an additional experiment I’m trying one of the wing (black) letters to see what that looks like with a red border, It’s worth persevering, at least for a little while.
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A bit windy yesterday for spraying so picked up some dust, however at a 30% mix, that looks about the right sheen and a decent contrast to the gloss
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With the test panel being curved its impossible to catch the light for all test strips but having now tried mixtures at 25%, 33% and 50%, I think 33% is the nearest to the desired effect but perhaps could stand a little more gloss, not as glossy as 25% though.
I'll rub down the whole panel and apply a 30% mixture before trying lettering on it.
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Thanks for the information Stu, I do buy the paints from a motor factor - Humberside Paints. They have suggested they can mix it but first I've got to determine the degree of sheen required. Once that's found I will probably get them to mix it so as to maintain consistency. The disadvantage of premixing is its expensive and the unused paint will always be matt.
In the past I've used whatever paint I could find in the colour I wanted, regardless of gloss, matt or satin, and then given the whole model a coat of KlassKote clear to bring all the sheens to the same consistency and to act as the fuel proofer. That works for so long but inevitably the fuel will find an edge and attack the paint below, also some paints are attacked immediately by the solvents if they haven't had sufficient drying time (which can be weeks) so for the past few years I've been using 2K paints and primer and trying to reduce the gloss by applying the paint 'dry'. Not being a proficient sprayer means the results have been inconsistent so this time I thought the matting paste approach might work.
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Thank you for the kind comments, and I agree the T31 engine is a little work of art, well done.
The tail section has been rubbed down as best I can. Its fairly easy on the sheeted parts, not at all easy on the open fabric areas. I wanted to get rid of as much dead weight as possible although I think its probably a waste of effort, the amount of paint that can realistically be removed is minimal.
The whole model has now been given a coat of 2K primer. When I started this job I thought that the tail was good enough not to require recovering so I'd just have to get round painting with the rudder and elevators in situ but perhaps not recovering was the wrong decision as the primer has shown up some damaged bits... I'll live with it.
Each engine bay has now had a coat of primer and a grey 2K topcoat. If this doesn't make a barrier to the fuel, I'm giving up and trying flat field soaring.
The engine bays are not particularly pretty but better than before.
Looking rather drab even in the afternoon sun and recuperating from a mini disaster - the wind blew the fuselage off the trestle. Not much damage, just a puncture in the covering underneath but annoying nonetheless.
A small patch was applied, and given a couple of coats of dope followed by some !k filler.
With a bit of luck it will hardly be visible once the topcoat is on.
Before the final coat can be put on, there are two little problems to solve. The first is to reduce the gloss of the paint to better match painted fabric. The second is to decide where the cheat lines should be and where the fuselage registration letters should be positioned on the cheat lines, so a bit of experimenting was called for.
An old test panel was rubbed down, given a coat of primer and then a topcoat of the white; actually its not white, its the lightest shade of grey I could get mixed. I prefer this as it looks less stark than brilliant white.
The lower part was then painted with matting agent added. The data sheet said to use it at a ratio of 1:2, though to me it looks too matt for the purpose. I'll try reducing the ratio next time.
Once the correct degree of matt is arrived at, the plan is to use the test panel to see how well the lettering masks will adhere to a matt finish and whether there is any paint bleed under the masks.
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Thankyou Graeme for the support, it does make a difference to the enthusiasm to carry on. Patience - yes, skill - not a lot, persistence - flagging sometimes!
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Ok Brian, yes the Sea Fury (Chiltern Models) with a Laser 180v I believe, what happened to that?
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Thanks for that Brian, Have our paths crossed in the past?
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Thanks for the comments, its good to know someone is reading this stuff!
The model could be described as mutton dressed as lamb. Its 25 years old and though much repair and rework has been done, its still an old aeroplane, that's obvious as soon as you look beneath the surface.
The goal is to get it into the air again and looking quite different from the drab impressed-into-service scheme it wore before. The finish will be a fictitious one inspired by (that's a modern euphemism for unimaginative copying) the final scheme of the Hampshire Aeroclub aircraft G-ACZP, pictured earlier. However I thought I'd modify it to resemble the first operator of G-ACZP which was Jersey Airways.
One of the problems I've given myself is getting the registration to look similar to the 1930's standard British lettering. None of the Microsoft fonts come close so it will be a case of designing the letters from scratch. The plan is to use G-ACXC which was the nearest registration to G-ACZP never put on an aircraft. It was originally issued in a batch for Cierva C30 autogyros, which weren't completed. G-ACXC is really only three letters - the G being a simple horizontal bar to a C so producing them should not be too much trouble. As the fuselage colours of red and white have their interface near the centreline with the letters superimposed, I thought that juxtaposed colours (red on white and white on red) fashionable at the time, would be an added interest.....all this is to play with in the next few weeks.
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The elevator and rudder servos, plus switches, sit on a tray high up and immediately behind the cockpit, this allows a straight run for the closed loop cables to the control surfaces. Below the servo tray is another which holds the receiver and Powerbox Lightbox.
Before committing to covering the bottom of the fuselage, I thought it a good idea to make sure I could access everything in the future through the top hatch. With 12 servos, 3 batteries and 2 lights it became apparent (after I had made the trays and supports) that getting all the wires connected was going to be a problem; I had not allowed enough space between the trays to get the excess wires out of the way using one hand.
Nothing for it than to create another hatch in the bottom of the fuselage below the trays.
Its done now. I can in future work, albeit awkwardly, but with both hands and hopefully once painted yet another hatch on the bottom won't be too apparent.
A trial fit to make sure no warps had crept in at the covering stage.
All is now covered (Koverall) and 4 coats of non-shrinking dope have been applied. There was a slight twist in the fuselage putting the tailplane low on the left hand side. Hanging a weight (a lipo battery) from the right hand Zulu shield while doping held the right position until the dope had dried and locked up the covering.
The next step is priming, using epoxy primer, which should offer the greatest resistance to the ravages of glow fuel and then painting can start in earnest.
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Just to reiterate what's been said about the old DB kits, I've built several and to my mind are value for money and have few drawbacks. Obviously the parts have been cut with bandsaws, but that doesn't mean care wasn't taken, whatever errors there may be in the general fit of parts shouldn't cause anyone, except a raw beginner perhaps, to have anxious moments.
The kits are remarkably complete and the design well thought out, which you'd expect of DB. It may be advisable to substitute some of the nuts and bolts for metric, stainless ones, the imperial hardware supplied were (zinc?) plated and succumbed to damp fairly quickly. Innovative thinking like the use of split pins as anchors for the struts works well, they're light, strong, unobtrusive and will pass the test of time.
I'd advise making the rigging functional rather than just decorative if you want the model to be aerobatic. Loops and stall turns are easy, rolls will need a lot of speed.
With its cavernous fuselage and long nose, there shouldn't be a problem in fitting the radio gear and getting the balance point correct.
The disadvantage of the one piece wing design is that it takes so long to rig, I'm fortunate in having a van so it will go in ready assembled but does preclude taking anything else to the field on a chosen day, and of course the model will take up valuable storage space unless derigged.
Don't let that put you off though, you'll be rewarded with an easy to fly model, not ridiculously non-scale and less likely to tip over on landings than some of its contemporaries, keep it into wind though......what's not to like about a DB SE5?
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The top and sides of the fuselage have been covered but I was holding off covering the bottom as I needed to complete the wiring for the landing and ground signalling lights and also solve how the closed loop cables were going to be installed once covering and painting were complete
The rudder and elevator servos are installed immediately behind the cockpit, there is a small hatch to access them and also switch for the receiver.
From the servos to the exit guides at the rear end is 57 inches, too long to feed cables straight through without them getting caught on the intermediate formers. I soldered two piano wires together, which is long enough to reach and intended to pull the cables through, but that drooped under its own weight and would not go far enough.
The decision was made to install a small access hatch under the fuselage, just large enough to get my hand in, where I could guide the piano wire in a straight line. The hatch cover is a piece of 1/8" liteply with one side given a single layer of fibreglass cloth which will form a base for painting. Hopefully it will be unobtrusive once all is painted.
The hatch simply spans two longerons and lined with some 1/8" liteply strips to form a seat for the cover and also gluing area for the gussets. 3/8" ply here may be overkill but they shouldn't break away under the strain of the small screws.
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Thanks for the suggestion but I’d rather not use a gazebo for a couple of reasons. Firstly, I tend not to build logically and don’t wait to start painting until everything is ready. I quite like bringing some parts to completion long before other parts as it boosts morale and sustains me through the less exciting bits – I’d be erecting and dismantling a gazebo quite often. Having said that a gazebo may have helped yesterday as a very light shower developed just as I was finishing painting one of the inner cowls. The sun was shining but I suddenly saw a few drops on the newly painted surface. Now dry, they’ve left some watermarks, it’s not bad enough to start over again but annoying none the less.
Secondly, and more importantly, I need a strong light (the sun) behind me to reflect from the work in hand so that I can watch the paint build up with each pass. Whenever I’ve tried painting under overcast skies I’ve been disappointed with the uneven result. Especially when trying to obtain a gloss finish, getting the coat wet (without overdoing it and producing runs) I find quite difficult but am helped considerably by seeing the reflection as the paint flows.
For this model I wanted to get a good gloss finish on those parts that would have been aluminium and a satin sheen on the fabric covered areas. I realise that high gloss on a 1930s aeroplane, even one which has had multiple liveries possibly into the 50s, wasn’t very likely but I wanted to try my best at getting a consistent shine on those bits which could shine.
Plan A was to leave on the masking until the black had been applied. Having sprayed the red, I started to get worried after 30 hours or so that the 2K paint would be hardening and with little prospect of suitable weather for further painting, by the time the masking did come off the paint would chip and form a ragged edge. I decided that it would be better to remove the tapes and mask up again; more work but I felt easier about doing it. The same has been done with the inner cowls as its unlikely there will be any more painting done in the next couple of days.
Seeing the result, it would probably have looked better with 2mm cheat lines instead of 3mm but I find its difficult to apply such narrow masks without distorting them – it’ll stay as it is!
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48 minutes ago, Jon - Laser Engines said:
I have had some mosquito's big enough to ride flying around my house. Blasted things, i have shown no mercy.
When i hit my yellow spitfire with primer all the bugs decided it was a nice place to land. It wasnt even the yellow primer ?
Yes, frustrating Jon. With spraying outside in the summer insects and dust are to be expected, but I didn't expect a fly on a cold winter's day; hopefully T Cut will improve it a bit.
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The outer cowls were masked using the cut masks and 3mm tape over the pre-applied coat of silver to create the cheat line, and then further masked where the black is going to go.
I think that applying the silver first was a mistake as it showed through the red when that went on. I had to apply 5 coats of red to obscure the silver. That would normally be ok if the part was a single colour or if any masking is to be removed while the paint is wet, but as I didn't want to remove the cheat line masks until after the black has been sprayed, the build up of paint will probably show a distinct edge once the tape is removed. We won't know until later.
If nothing else, I learned that provided the weather is dry, spraying can go ahead when the temperature is 4C. I also learned that flies will come out even at that temperature!
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Good luck with the DB SE5, there's nothing really wrong with the original kits. I've just finished restoring one I built over 25 years ago. I'd used (painted) Solartex as the covering; time and glow fuel took its toll on the finish so all the covering was stripped off and recovered with Sig Koverall and painted with Klass Kote.
Its flying again now with its original Laser 200v which, to my mind is the perfect fit for the model.
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With the covering nearly complete, thoughts turn to the colour finish, which is going to be loosely based on G-ACZP built in 1935, named Belecroute Bay and first operated by Jersey Airways. It was the longest surviving aircraft although this only lasted until October 1958 when it suffered a leg collapse after ground looping at Barajas airfield near Madrid and was subsequently destroyed when the ground handlers attempted to lift the wing with a forklift truck and broke the main spar. It never flew again.
The final livery of G-ACZP was that of Hampshire Aeroplane Club, owned by the charismatic Viv Bellamy. The aircraft was a DH86A whereas the model is a B, incorporating the larger tailplane and Zulu shields of the developed aircraft. It seemed to me that as the earlier full size aircraft has displayed unstable flying characteristics, I’d be safer building the B version.
The picture below shows the details of the colour scheme better than the ones above. The picture has an orange hue but it was red and white. I've read that the 'eyebrows' on the cowls and the fuselage stripe were navy blue and gold however, not following the original scheme exactly, I intend to paint these black and silver. Also the eyebrows are centred somewhat below the spinner centre lines though I'd prefer them to be on the same axis.
I wanted a civilian finish with a British registration and one which hopefully would be visible in the air to my failing eyesight, predominately white with some red seemed a suitable choice. At least it’s a departure from silver wings which most of the aircraft had and can seem almost camouflaged against British skies.
The model is unlikely to be entered into a competition so having a finish which does not replicate a full size example in my view isn’t a detriment.
What is important is getting the eyebrows and the fuselage stripe all in line. With so many curves it proved difficult to measure but if I got it wrong, it would be obvious once assembled in all its glory at the field. A eureka moment occurred when I remembered that in the loft was a laser level. All that was required was a new set of batteries and a tripod.
By using the bottom of the windows as a reference to level the model, it would then be quite simple to adjust the laser level to line up on the cowls.
Having found the centre of the prop-driver hole and lined up on that, all that was required was to mark the rear of the cowl to get a parallel line with the fuselage.
The picture below of the left outer cowl shows that my initial determination by measurement was out by about 1/8", perhaps that's acceptable for one cowl but if the others had a similar error in the opposite direction it would become obvious, this way there's no mistake.
To get consistent eyebrow shapes would also be a challenge. Using masking tape freehand on a single cowl has worked in the past but with four cowls, it becomes a bigger problem.
About 18 months ago I treated myself to a vinyl cutter, mainly to cut registration masks but it will make whatever shape is required. The shapes below are 3mm wide which should produce decent cheat lines without being too pronounced.
So far I've been cutting paper rather than waste expensive mask material. These seem to be getting fairly close to the curves required.
The straight lines can 3mm masking tape and will stay put for a few days while painting. I think if I'd tried to curve the tape around the front of the cowls they would have a tendency to creep.
All that's needed now is some fine weather similar to last week to continue painting.
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Thanks for the compliment Brian. I now find working with fibreglass to be so practical and not at all difficult, so prefer it in most instances to litho.
I had always assumed that the lamp in an aircraft was white. All the DH86 pictures I have are black and white but appear to show the lamp as having a clear lens. White is surely the most penetrating colour and hence easiest to see from the ground, so I don't know what the lamp is under the Rapide, perhaps you could ask one of the staff at Old Warden.
Regardless of the answer mine is going to be white, its only a semi scale model and if I can get a decent flashing light under the nose, I'll be happy.
Yes, I'm sure the only time the lamp was used was to signal morse code messages.
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The top and each side of the fuselage has now been covered, not the bottom yet as I still need access for installing the control cable and servo cable runs. The covering is again Sig Koverall.
Prior to covering, a bit of work was done in making the the landing light and a ground signalling light removable. This picture shows the original lamps glued into position.
The lamps were 12v 50w and 35w halogen ones driven by a circuit I had designed using my limited electronics skills. The signalling lamp flashed ½ second on ½ second off, which was all I could achieve with a simple 555 timer. I was going to retain the system as is, however on testing the circuit the ground signalling light would flash but the landing light wouldn’t work. There is a fault on the board somewhere which makes one of the relays chatter and I can’t find out why.
It looked a bit Heath Robinson so a neater and more modern approach would be 12v 4.2w leds and a Powerbox lightbox powered by a small 3s lipo. This amazing little unit has 4 programmable outputs so will do all I want to achieve (its on order but not arrived yet). Also, the lamps were glued in which made changing them impossible without causing damage. Fortunately neither lamp failed, however I decided that making the lamps capable of replacement would be a better arrangement so the old units have been cut out and the new ones held in with screws.
The landing light is now held in place by a simple fibreglass ring which retains the glass lens (a cabochon) and in turn, the lamp.
The ground signalling lamp is held by trapping the flange of the lamp between two liteply formers screwed to bearers in the fuselage.
The fibreglass ring was moulded in place using trusty parcel tape as the release medium.
A few layers of 50 gm cloth followed the curves and once dry, a hole cut out which was slightly smaller than the cabochon to hold it in place and the excess trimmed off the rear to form another circle. Small wood screws screwed into the original ply ring hold everything together.
At first I drilled the holes too close to the edge of the ply ring, so had to apply the trusty Cataloy and have another go. This time the holes are in the right place. I'm sure the final painting will cover up the mistakes!
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Danny,
Keep in mind that the solder will follow the heat - as you warm the area play the heat towards the stub to try and make a stub reach temperature before the header. Things are working in your favour as the stubs have a lower mass than the header, so will heat up sooner, however if you work the heat to ensure that happens, you'll find that when the melting point is reached the solder will run into the joint rather than down the side of the header.
Judging how hot things are getting is a bit of a black art but have a go on your test piece. Keep saying to yourself, the solder will follow the heat!
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The cockpit framing is made from 1/8" ply and I thought, looked a bit rough with its popped, scratched and yellowing, re-glued windscreen panels.
I suppose it was in keeping with an impressed war weary transport aircraft, but the new finish will be civilian, in which case a bit of smartness is called for.
The old panels were removed and new ones glued in using RC Modellers canopy glue. The framing was then given a make-over with lithoplate to create sharper corners and neater edges to the windscreen panels.
Here the panels have been masked in readiness for covering and painting. The windscreen area will be white eventually, as will be all the upper half of the fuselage so I'm hoping it won't look as stark as it does just now against the rest of the structure.
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Thanks for that Jon. Yes, the plan is to have it ready for the spring.
All the repair work has been done and its now cosmetic stuff really. I've decided to do some work on the cockpit framing which will take a while, after that its final preparations for covering the fuselage. I think I have everything needed, except for rigging materials, I've binned all the old stuff and will renew.
I'll post pictures once there is something meaningful to see.
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The wings have a high aspect ratio and sharply tapering tips. To prevent tip stalling, aerodynamic washout was incorporated by a gradual change of wing section plus physical washout with the trailing edge built with the tips at a lower incidence than the root. To maintain that washout during recovering, a simple jig was made to hold the root in one position while twisting the wing a bit and at the same time shrinking the covering with an iron. 3 hands would have been better but this method sufficed.
Non-tautening dope will be applied so hopefully no further stresses should be induced.
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DH86 Refurbishment
in Own Design Project Blogs
Posted
After rubbing down again and repainting with the white basecoat, another attempt was made.
This time I thought I would try one of each size of letter and see what the wing letters would look like with a red border. I wasn't keen on the result, the paint had lifted again when I tried to remove the mask, probably because I tried to remove it too early so I left it for a day and then the rest of it came away ok. Also I didn't really like the border so will paint the wing letters black only, it will certainly save on the two stage painting process.
The fuselage letter I was satisfied with this time though there are small areas where the re-masking wasn't exactly right which has left some white bits, if this happens again it can be touched up with a airbrush or very small paint brush. I made the mistake of not removing the mask from the top half of the G bar, note to self 'don't make that mistake on the fuselage side'!
All of the white areas have now been painted, including the wings, so as soon as the weather improves to allow painting, the red will start to go on.
I was hoping to have the model ready for the LMA static event at Cosford next weekend but I'm sure now it won't be complete, however the events which were previously held at Gaydon and this one replaces, were supposed to be a work in progress show, so I'll take it anyway.