Nev Posted November 23, 2014 Author Share Posted November 23, 2014 I haven't got any posh pink pins John, had to make my own out of sharpened bicycle spokes. Some can be a bit tricky to get through the hard balsa spars. Quote Link to comment Share on other sites More sharing options...
Kevin Fairgrieve Posted November 24, 2014 Share Posted November 24, 2014 Posted by Nev on 23/11/2014 21:10:26: Just remembered in time to tape the plan to the window so I could trace trough to the other side, otherwise it would have been next weekend before I saw any daylight. Nev. Thank you for that reminder. I will get mine done today as well. Kev Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted November 24, 2014 Share Posted November 24, 2014 Kev, you could try rubbing the plan with meths. It goes transparent and you just turn it over. I did mine at the weekend and it's still usable. I went over the main lines with a pencil and ruler to be on the safe side, but it wasn't really necessary. Edited By Colin Leighfield on 24/11/2014 19:27:53 Quote Link to comment Share on other sites More sharing options...
Nev Posted November 29, 2014 Author Share Posted November 29, 2014 I bet everybody with the CNC wood kit has assembled these 4 bits of wood and thought Hmm ! Me too, they are very loose fit. Having decided on a 3 part wing build however I had to make a centre section. So spent quite a bit of time drawing vertical lines on everything and making a nice square jig. Then taking a deep breath, take the already assembled bits in one hand and apply glue with the other. Smartly putting it back on the jig to square it up before the glue start to go off. I used a polyurethane adhesive so it foamed into the joints. Now it’s done I’m pleased with it, although it was a bit of a faff. I also added a temporary brace across the back to set the height and hopefully to stop me braking it again. So now I have these bits all ready and can do this. It’s not glued up yet, just checking it all fits. I want to do a bit more on the wing panels, fit servos and make flaps before permanently fitting them together. But it looks like it’s going to work and I should be able to jig it straight, so feeling a lot more confident. Nev. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted November 29, 2014 Share Posted November 29, 2014 That's the way Nev, whichever way you choose get on with it looks like a good un John Quote Link to comment Share on other sites More sharing options...
Nev Posted December 14, 2014 Author Share Posted December 14, 2014 These are fiddly things too put together, didn’t particularly enjoy this bit. All the ribs are set at a different angle ( apart from one, which was much too big ) which means you have to twist the leading edge down onto the rib as the angle gets more acute as it gets toward the tip. Never made flaps / ailerons like this before, so presume this is normal. When you unpin it from the board the leading edge straitens out and puts a twists on the aileron. I was a bit worried by this as I was building it, convinced it was all going to go in the bin. I am not sure if the twist is for some form of washout, it has that effect, or if it just follows the shape of the wing as the ribs get narrower. But it all seems to line up and follow the wing shape. So now I’ll do the other side and if I get 2 the same I’ll assume it was all some sort of clever design and get on with the next bit. Not getting much time on it now though, must be the time of year. Nev. Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 14, 2014 Share Posted December 14, 2014 Not sure that's right Nev, mine were built the same way but the ailerons and flaps remained flat when lifted from the board. Did you keep them pinned flat until the capping strips were on? Cheers Danny Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted December 14, 2014 Share Posted December 14, 2014 Hiya Nev If you're saying you had to twist the l/e to meet the ribs, then it's twisted. L/e should remain straight and sand ribs to fit (if angle was wrong). John Quote Link to comment Share on other sites More sharing options...
Nev Posted December 14, 2014 Author Share Posted December 14, 2014 Hi. It's hard to describe, every rib has a different leading edge angle and the angle gets more acute as you get to the tip. Cut parts match the plan both are the same, try overlaying the last on the first, it's about 2 degrees rout to tip. I'll try and measure it later but it is intentional. I only noticed it when I stacked the ribs together and you can see a progressive change. I built it pined to the board until all the cap strips were on but you either get a twist in the aileron or if you built it rock solid you would set the twist in the leading edge. Now it's built it looks right because as the ribs get thinner the trailing edge of the aileron lifts to match the line following the underside of the rib. It "looks" like washout. Not describing this well, I'll try and take photos. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted December 14, 2014 Share Posted December 14, 2014 I follow you Nev, mine are straight but I cut them myself and I have no roll/twist in them John Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 14, 2014 Share Posted December 14, 2014 I understand you too Nev, and immediately went and looked at the ribs on the plan, and as you say they do alter as far as the leading edge goes from root to tip. Perhaps the wood I used was very soft as I didn't have to exerpt much pressure to bring the leading edge into contact with the ribs, in fact I don't recall any pressure. Relying on the twist of the leading edge would be too hit and miss for a designer, as this would depend on the stiffness of the wood used. As I said mine was very soft. The best way is to build the ailerons with the wings and only seperate them once sheeted. This is a common method of ensuring the washout in the wing matches that of the aileron. However as long as the twist is the same you will be fine, it is acting as washout which is no bad thing. Provided the sides match Cheers Danny Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted December 14, 2014 Share Posted December 14, 2014 Aha, I chucked my first ones away Nev I thought they where twisted (page 12) John Quote Link to comment Share on other sites More sharing options...
Nev Posted December 14, 2014 Author Share Posted December 14, 2014 Thanks chaps. I think a lot of this is optical illusion and a bit of my inexperience. This is what got me worried, if it shows up. Built up I saw what I was expecting, a twisted aileron. I tried to line this one up a bit better and the bottom is flat, the top leading edge tapers in toward the tip so enhances any twisting. I still think there is a twist, maybe not as much as I imagine, intentional or not I don’t know but like you say if they both come out the same I’m happy to use them. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted December 14, 2014 Share Posted December 14, 2014 I can't see owt to worry about there Nev John Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted December 14, 2014 Share Posted December 14, 2014 I agree with John looks pretty good to me Cheers Danny Quote Link to comment Share on other sites More sharing options...
David Hardaker Posted December 14, 2014 Share Posted December 14, 2014 It looks OK, at least the aileron is slightly washed out. Not harmful, in fact quite beneficial ! Quote Link to comment Share on other sites More sharing options...
Nev Posted December 14, 2014 Author Share Posted December 14, 2014 Before this the only built up ailerons I have made have been dead flat built out of 1/4 square, so this is a bit of a change. Luckily I cut all the wood for both sides at the same time, from the same sheet, so they should be the same. Apart from moving a rib or two so I can reposition the horn to match my servos that is Quote Link to comment Share on other sites More sharing options...
Charles Galloway Posted December 14, 2014 Share Posted December 14, 2014 The same happened to me. The first two I built I threw away thinking they were twisted. I then sanded the L.E of the ribs to the same angle and got straight ailerons. Since the plan has no mention of washout I assumed it was a drawing error! Cheers, Charles. Quote Link to comment Share on other sites More sharing options...
Nev Posted December 14, 2014 Author Share Posted December 14, 2014 Cheers Charles. I think that is exactly the problem with this plan. If it had a few notes just to let you know what the end result should be, most folk would be happy to just get on with it in there own way. Don't get me wrong I'm not criticizing, I couldn't draw it, but I have to spend twice as long thinking as I do building. Having said that, after this I don't think there is anything I wouldn't consider. Assuming I could get it in the shred Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted December 15, 2014 Share Posted December 15, 2014 He don't share much information with the plan user Nev, but on the plus side he encourages you to think for yourself John Quote Link to comment Share on other sites More sharing options...
Nev Posted January 2, 2015 Author Share Posted January 2, 2015 Hi all, I hope everybody has had a good start to the New Year and long may it continue. Not much building for me, well actually that’s not quite true, maybe I mean not much to show for it. Did have a day or so off though and managed to get into the garage in daylight so got the metalwork done. I found some thin steel sheet, 0.6mm thick, a bit more substantial than a bean can but still workable. Servos are in so its only a bit of sheeting and a couple of hinges to go !! Soon be on to the fuselage. Nev. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted January 2, 2015 Share Posted January 2, 2015 All looking good Nev, you'll enjoy the fuz John Quote Link to comment Share on other sites More sharing options...
Nigel Day Posted January 3, 2015 Share Posted January 3, 2015 Hi Nev and Happy New Year. Looks as though we're keeping pace now. I'm just finishing off the servo installation and have started on the fuse. The planking looks fun. Quote Link to comment Share on other sites More sharing options...
Nev Posted January 13, 2015 Author Share Posted January 13, 2015 Enjoy the fuz he said, I’m sure I will when I get to it. Actually I’m not rushing into that bit, want to get as much of the wing done as I can. If anybody thought they were short of space… Anything’s possible. Had to borrow the dining room table to sheet the underside. It may look precarious but its well nailed down. Which all helped to get a dead straight wing, no twists and equal dihedral (ok about 4 mm out but that’s good enough for me). Port side one day, stbd the next and back up in the office today before anybody noticed. I know its not correct for scale but an 8mm LED is about the right size for the navigation lights, needs a bit of work to make them look right. Fuselage by the weekend I think John, then I can catch Nigel up. Nev. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted January 13, 2015 Share Posted January 13, 2015 Keep nibbling at it Nev you/we will get there some day John Quote Link to comment Share on other sites More sharing options...
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