Robin Kearney Posted December 1, 2012 Share Posted December 1, 2012 Looking good Tim. Do you mind if I ask how you will ensure the holes drilled in the tailplane will line up with those nuts? Although thinking about it I guess a marked centre line and measuring would probably do it! Ignore me it's been a long day Have to say the 'outer' written on the spat made me chuckle, how I wished I had done that last time I made a pair of left spats r. Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted December 1, 2012 Author Share Posted December 1, 2012 Robin, You're right about the marked centreline on the tailplane, followed by undersized holes pierced with an awl. I then use the awls to centre the tailplane whilst I measured the distance from tail to wing tips. I'm within 2mm, so that's fine! Yup, I too have made an identical pair of single-handed spas in the past. Hence the labelling.... tim Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted December 2, 2012 Author Share Posted December 2, 2012 Ah, tough choice this morning; A day in the workshop, or take advantage of the windless, dry weather and head off to the field. Not easy, is it? Anyway, I did do some more to the spats after I got back! I find it best to work on both spats at the same time, and to mark exactly where I'm planning to saw and plane. First stage is to mark and saw off the front and rear corners..... ....followed by the upper shoulders. A few minutes with a sanding block gives quite a pleasing result! Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted December 9, 2012 Author Share Posted December 9, 2012 Well, that's been a busy week what with work and gigs etc. Never mind - I've been able to spend a most of the weekend in the workshop. So the undercarriage was fabricated, and then I was able to pin all the bits of the airframe together! Quote Link to comment Share on other sites More sharing options...
Concorde Speedbird Posted December 9, 2012 Share Posted December 9, 2012 Can you stick it next to the original for comparison? Looks great! CS Quote Link to comment Share on other sites More sharing options...
Erfolg Posted December 9, 2012 Share Posted December 9, 2012 An exquisite work of craftsmanship. No that is not enough, it is also a work of art. Perhaps it should not be covered. Or better still light glass cloth and WBV. Just letting the wood show through. Perhaps just a few vivid coloured wing stripes to aid orientation. I seems a shame to risk it in the air. Maybe one flight, and then displayed, as a modern day piece of functional art. It needs to be seen at the Manchester Model exhibition next year, particularly if RCM&E were to have a stand. Quote Link to comment Share on other sites More sharing options...
David Ashby - Moderator Posted December 10, 2012 Share Posted December 10, 2012 That looks right grand Tim Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted December 10, 2012 Author Share Posted December 10, 2012 Thank you Gents! CS, the big CS is 25% larger than the older CS. I'll try to get comparison pics at some stage later. tim Quote Link to comment Share on other sites More sharing options...
Concorde Speedbird Posted December 10, 2012 Share Posted December 10, 2012 Well it will fly much better then I think, and from what I have heard the old one flew brilliantly so it will be superb! It looks nice and racy, although if I built one I reckon I would give it a standard tail (which does kind of lose the point of the design, but I like simplicity!). What colours is she going to be? CS Quote Link to comment Share on other sites More sharing options...
Erfolg Posted December 10, 2012 Share Posted December 10, 2012 I do not see a problem with a standard tail, as long as it is located on top of the side panels. It would be just out of the downwash, although there will be a little influence. I think the biggest challenge from albeit limited experience is the sweep forward and orientation. Swept back seems to cause no issue, a straight wing is what we expect. When I have flown the smaller one, some observers have said that they thought it was going in another direction at times. As a model the small model is very good. As you suggest, a larger version should be better still. My model has no undercarriage, i do not know if that is the reason that my model has a very flat approach. Getting it into the field, in some wind directions is more difficult than some models. As you cannot afford to be much more than 2 m above a hedge, if you want to land near to you.. Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted December 10, 2012 Author Share Posted December 10, 2012 Gents, I don't see a problem with fitting a standard tail either! Like Erf says, just glue it to the top of the fuselage sides, and fit a normal all-sheet fin on top. The only downfall I can see is that it'll probably be lighter at the rear than the T-tailed original, so you might want to relocate the fuselage servos further aft. As for the colours, I'm going with the patterning of the original but with a different colour choice. So the nose will be metallic green, the spanwise stripe will be dark green and the rear end will be a sort of goldish-silver. Tim Calvert of modelmarkiings.com has already supplied the logos for the rear fuselage, so these should be available comercially - providing the model actually flies, that is..... I got the CS60 on the scales this evening; 5S 4000 cell pack - 1lb 2oz Servos (4) - 10oz Airframe (inc motor, ESC, prop, spinner, wheels etc) - 3lb 14oz Total so far - 5lb 10oz. I'll need to add covering, rx and linkages, so I guess we'll be looking at an AUW of just over 6lb. At the moment, with the cell pack as far aft as it can go without performing minor surgery on F3, and the servos dumped just below the pilot, the model is slightly nose-heavy when suspended at the 28% MAC mark. tim Edited By Tim Hooper on 10/12/2012 21:26:48 Quote Link to comment Share on other sites More sharing options...
Concorde Speedbird Posted December 11, 2012 Share Posted December 11, 2012 10oz for 4 servos, which is 2.5oz a servo, that's more than I expected. My 'standard' (I assume you are using standard sized ones) servos of choice are smaller than standards (HS225BB's here) and they are 0.95oz a servo- so 3.8oz for 4 (if my maths is correct with these imperial units!). They would have plenty enough torque I think and it would save 6.2ozs! Have you calculated the wing loading yet? Should be quite good I reckon! CS Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted December 11, 2012 Author Share Posted December 11, 2012 CS, To be fair, I just picked up the packaged servos and slung them on the scales. I do agree that the aileron servos are probably over the top, but remember that the elevator servo has to operate a snake through quite a sharp curvature, and that the rudder servo is also linked to the steerable tailwheel. tim Quote Link to comment Share on other sites More sharing options...
Concorde Speedbird Posted December 12, 2012 Share Posted December 12, 2012 For the snake curve, simple- just add a dorsal fin for the snake to run through with a much more gentle curve and use a lighter servo. The tail wheel problem is also an easy one to solve, use the rubber band method of attaching the tail wheel to the rudder and that way the servo will take little strain. Lighter servos, better flying performance! CS Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted December 12, 2012 Author Share Posted December 12, 2012 CS, You're a diilgent fellow, aint'cha? So a dorsal fin with the ele snake running up the leading edge? What a splendid idea! I'll file that one away for future use, if you don't mind. Attaching the tailwheel with elastic bands, actually doesn't stop the servo from taking all the strain, but it does help damp out the sudden shocks. In the same way as the dampers on a car's suspension, don't take any of the dead weight of the car from the springs, but serve to soften the shocks. Good thougts though, so keep them coming! tim Quote Link to comment Share on other sites More sharing options...
Concorde Speedbird Posted December 12, 2012 Share Posted December 12, 2012 Thank you, great to hear that from such a great designer! I do try my best... Feel free to use any ideas, that's what this forum is for! I was just thinking of the dorsal on my Domino which I need to build, and I thought of the elevator snake for a T-tail with reduced curve so I put the idea on here! The tail wheel method is well known, and as you say it acts like a shock absorber and if there is a big shock the band will break. I enjoy thinking up new ideas, all part of the fun of this hobby! Keep up the building, I want to see this one in the air! CS Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted December 15, 2012 Author Share Posted December 15, 2012 Here's a couple of pics of the undercarriage. Made from 8swg wire, it's cold-formed (ie. beaten with a big hammer) into shape. Experience has taught me than rather than worry about to much about the exact shape of the legs, the important bit is to ensure that the two axles are in line with each other. Leaving the axles over-length by beginning the bending process with the centre bends, in the middle of the wire, does result in a bit of scrap at each end, but saves lots of faffing about. After I was satisfied with the general layout, I added a strengthening cross-piece - wire-bound and soldered into place. Incidentally, I'm using a 60 watt iron and ordinary lead-free multi core solder for all the joints. Here's a close shot of the axle end of the leg. The vertical part of the leg will fit into that recess in the back of the spat, No screws are used; instead I'll use silicon mastic between that brass plate and the spat itself, thus giving a fair degree of flexibility. Edited By Tim Hooper on 15/12/2012 21:05:42 Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted December 16, 2012 Author Share Posted December 16, 2012 Found myself faced with a stack of ironing to wade through. It's not easy being a Domestic Goddess.... Quote Link to comment Share on other sites More sharing options...
chris edwards 3 Posted December 16, 2012 Share Posted December 16, 2012 really like the green colour that you have gone with so far tony, looks superb. Quote Link to comment Share on other sites More sharing options...
Concorde Speedbird Posted December 17, 2012 Share Posted December 17, 2012 At least you have only one wing to cover! Looking good! CS Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted December 18, 2012 Author Share Posted December 18, 2012 CS, The wing is the easy bit. The hard bit is all the lumps and bumps around the nose area! tim Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted December 24, 2012 Author Share Posted December 24, 2012 Some shots of the details.... The aileron linkage builds in some differential. The tailwheel is connected to the rudder with a rubber O-ring. Note the air exits. Inside the fuselage there#'s plenty of room for all the gear. Even with the wing in place, battery access is still good. Edited By Tim Hooper on 24/12/2012 18:55:03 Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted December 24, 2012 Author Share Posted December 24, 2012 So I think we're about ready to go! AUW has come out at 5lb 13oz, giving a wing loading of 22 oz/ft. Tim Calvert at modelmarkings.com supplied the graphics. Good, eh? Quote Link to comment Share on other sites More sharing options...
Tim C Posted December 24, 2012 Share Posted December 24, 2012 Tim, An absolute cracker, (excuse the seasonal pun), lessons in covering please!!!. its perfection Hope it flies as good as it looks!! Tim Quote Link to comment Share on other sites More sharing options...
Chris Bott - Moderator Posted December 24, 2012 Share Posted December 24, 2012 Looks superb Tim, but we've come to expect that. With no scale reference it looks just like another CS. Which I suppose was the object of the excercise. Can you get a shot of the two together again? Good luck with the maiden Quote Link to comment Share on other sites More sharing options...
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