Martyn K Posted November 8, 2012 Share Posted November 8, 2012 I think that I have already said that I plan to do a built up wing variant of the mass build model. I am not a great lover of sheet wings - (I think that) it's too difficult to find sufficient quantities of decent quality wood nowadays.. I have drawn up a set of wing ribs based upon a NACA0010 wing section. An A3 printable set of wing sections can be downloaded from here I have also saved the output as a DXF file in case anyone wants to get a set of laser cut ribs done.. Please PM me with an e-mail address if you want a set. The salient details are: 1/16" sheet LE upper and lower to the main spar. Some root ribs will be liteply All spars etc balsa is nice easy to get 1/4" stock. Tapered spars will be simply cut from sheet.. Using 1/16" webs up to bay 6 from the root Wing rib spacing 57mm equidistant. 1" soft block wing tips to get that nice curvy tip shape 1/16" x 1/4" cap strips from main spar to TE spar Sheet ailerons and infil behind the TE spar. Keep the wood light.. I am not producing a fullsize plan, I am simply going to draw onto the shop plan to place the rib spacing. Undercarriage, servo mounting etc - haven't thought about it yet.. Power - probably a .20/.25 size whatever I have got lying around at the time.. This will be slow, already got 3 models WIP.... Martyn Quote Link to comment Share on other sites More sharing options...
WolstonFlyer Posted November 8, 2012 Share Posted November 8, 2012 Hi MartynVery interesting idea, gives me something to think about for my build as I want an undercarriage. Do you think retracts would fit?My plans should arrive soon so I will cut the ribs from card or depron or something and see how the model will look.I have never built from plans before so is building a wing like this very hard to do? Quote Link to comment Share on other sites More sharing options...
Martyn K Posted November 8, 2012 Author Share Posted November 8, 2012 Hi WF If you have never built from plans before then I suggest that you stick to the plan Re-engineering means a lot more planning and analysis as you are basically moving away from a proven formula. However, I don't think it is that difficult to build a wing, providing that you are patient and make sure you are happy that everything fits before you commit to glue.. I am not sure if you will get retracts into the wing or not, the thickness is 10% of the chord so it will be very tight but you may get micro retracts to fit somehow. Personally, I'll be going for fixed trike u/c with a steerable nosewheel (somehow). If you go down this route, I'll be happy to help any way I can, but I know nothing about building with depron - sorry. BW Martyn Edited By Martyn K on 08/11/2012 14:12:55 Quote Link to comment Share on other sites More sharing options...
Ian Jones Posted November 8, 2012 Share Posted November 8, 2012 Well I was going to stick with the sheet wing but since you have done the hard bit I just might hange my mind. Quote Link to comment Share on other sites More sharing options...
Martyn K Posted November 8, 2012 Author Share Posted November 8, 2012 Hi Ian No problemo... need to think how the u/c will fit though. To keep in the spirit of the design, I have gone for a slim section which will make getting a stiff enough undercarriage mount a challenging proposition.. A solid wing doesn't have that problem. Martyn Quote Link to comment Share on other sites More sharing options...
WolstonFlyer Posted November 8, 2012 Share Posted November 8, 2012 Thanks MartynWhen the plan arrives I will have a look. I think you might be right about sticking to the plans for my first build.I would just do a mockup in thin Depron just with the ribs you have designed, to get a feel for how things go together.Cheers Quote Link to comment Share on other sites More sharing options...
Nev Posted November 8, 2012 Share Posted November 8, 2012 Well now you have got me thinking. I wasn’t going to join in this time as I already have the Wizzza, so didn’t want another similar model but this could be something to think about. Quote Link to comment Share on other sites More sharing options...
Martyn K Posted November 8, 2012 Author Share Posted November 8, 2012 Go for it Nev - you know it makes sense Martyn Quote Link to comment Share on other sites More sharing options...
Concorde Speedbird Posted November 8, 2012 Share Posted November 8, 2012 Are you going for an IC engine? Sounds like an interesting variant I'll follow this one through. I wonder if anyone will do foam wings?! CS Quote Link to comment Share on other sites More sharing options...
Martyn K Posted November 8, 2012 Author Share Posted November 8, 2012 Yes - a .21 or .25 probably but will see what the AUW looks like. I was hoping to use a spare .15 that I have but I think that will be too small Regards Martyn Quote Link to comment Share on other sites More sharing options...
Martyn K Posted November 8, 2012 Author Share Posted November 8, 2012 Posted by Ian Jones on 08/11/2012 16:25:41: Well I was going to stick with the sheet wing but since you have done the hard bit I just might hange my mind. Hi Ian I'll print you a set of iron-on rib transfers.. Martyn Quote Link to comment Share on other sites More sharing options...
WolstonFlyer Posted November 8, 2012 Share Posted November 8, 2012 Hi MartynPM sent, thanks. Quote Link to comment Share on other sites More sharing options...
kc Posted November 8, 2012 Share Posted November 8, 2012 WolstonFlyer. For your first built up wing choose something with a parallel chord wing -- it's much easier! Stick to sheet for the Tucano. Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted November 8, 2012 Share Posted November 8, 2012 Hi Martyn, this is a variation I'm also considering. NACA0010 is a very thin section - probably good for a faster model like this. But one thing to consider is that its a symmetrical section. This almost certainly means you are going to have to change the incidence - probably making it a little more positive. I don't know what Nigel's design is rigged to - possibly zero-zero. Maybe Nigel could advise? BEB Edited By Biggles' Elder Brother - Moderator on 08/11/2012 19:54:01 Quote Link to comment Share on other sites More sharing options...
Concorde Speedbird Posted November 8, 2012 Share Posted November 8, 2012 Brilliant, it should go well with an engine up front! BEB, I thought you'd turn it into a bipe! It is a little out of scale, but... CS Quote Link to comment Share on other sites More sharing options...
Martyn K Posted November 8, 2012 Author Share Posted November 8, 2012 HI BEBI did look fairly closely at the original. I admit that it isn't symmetrical but it's so thin that it will have to fly at a positive AoA to generate any lift. My thoughts are that I was planning to use the same geometry - I would guess that any trim variation could be eliminated by a couple of clicks of up. I did think of doing a hybrid naca0008 lower, naca0012 upper but I am not sure that the effort is worth it. However, I am more than happy to be corrected on that point!Bw Martyn Quote Link to comment Share on other sites More sharing options...
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