Tim Hooper Posted February 28, 2010 Share Posted February 28, 2010 So when the full-sized aeroplane spanned a mere 18ft, a 1/6 model is still a tiddler at 36"! So here's the latest refugee from the building board. She features a flat-plate wing and all-sheet construction. Power comes from a proven set-up; Typhoon 15/10, 8x6 APC, 3S 1800mah li-po. I'm almost at the covering stage........ Flat plate wing. Basic fuselage construction. Some seriously sexy spats from balsa. General view of the underside. Pinned together for the very first time. No, that's not me. Edited By Tim Hooper on 28/02/2010 09:04:09 Quote Link to comment Share on other sites More sharing options...
IanN Posted February 28, 2010 Share Posted February 28, 2010 Great looking plane, Tim. One of my all time favourites . Brilliant stuff! And WHAT a coincidence. I'm doing almost exactly the same, though you're a good way ahead of me on your build. I've just got the scaled outline drawn and some parts cut: project now on hold whilst I finish Hoehnia. Drawing to 1 / 5.9 scale, which is what I reckoned Tony Nijhuis's racing pair were, gave me a 36.1" span Rivets. OS 25LA going in mine I've got a couple of plans of larger Rivets models, and was intending to use the CoG from those as a starting point. I can dig those out now and send you that info if its any help Quote Link to comment Share on other sites More sharing options...
IanN Posted February 28, 2010 Share Posted February 28, 2010 And just to inspire you to get it finished and flying... Quote Link to comment Share on other sites More sharing options...
Ton van Munsteren Posted February 28, 2010 Share Posted February 28, 2010 Tim, Thats a lovely airplane, have to build one myself, so please send the plan to RCM&E. Why did you go for a plank wing and not a rib construction. Have you flown this type of wing before. Ton Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted February 28, 2010 Author Share Posted February 28, 2010 Cheers Guys! Ian, so you're doing one too? Marvellous! I worked the CG to my usual 28% MAC, which equates to 100mm behind the LE at the root (exactly where the side cheeks end), but I'd love any further info you may have access to. Ton, I think I've developed Hawes Syndrome - a morbid fear of wingribs....... Actually, I just wanted to make a quick-build sport model. Yes, I've used the flat-plate configuration a few times now. The purists may turn up their noses, but at this scale there's no denying that it works very well! tim Quote Link to comment Share on other sites More sharing options...
IanN Posted February 28, 2010 Share Posted February 28, 2010 Tim, by LE "at the root", I'm assuming you mean the point at which the LE meets the fus side (NOT the LE which you would find at the fus centreline, in plan view, if you extended both LEs to the point where they intersect) I've looked at both the plans I have, and measuring chord from the point where the LE meets the fus side... Tony Dowdeswell's aircraft - a semi scale Rivets, stretched to meet the then FAI pylon rules - balances at 36.6% chord. Apologies for poor scan quality... Al Greenwoods F1 racing model (nearer scale) shows balance point at 42.4% Not saying your fig is right or wrong - I'm a good way off being ready to calculate my own yet - just passing on what I have. Happy to send you a scan of the relevant part of each plan. PM me your email addy if that would help Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted February 28, 2010 Share Posted February 28, 2010 That "T" tail always looked very vunerable to me but prettier than te low tailplane. Nice model. I am sure that plans would be popular. Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted February 28, 2010 Author Share Posted February 28, 2010 Posted by IanN on 28/02/2010 17:55:48: Tim, by LE "at the root", I'm assuming you mean the point at which the LE meets the fus side (NOT the LE which you would find at the fus centreline, in plan view, if you extended both LEs to the point where they intersect) I've looked at both the plans I have, and measuring chord from the point where the LE meets the fus side... Tony Dowdeswell's aircraft - a semi scale Rivets, stretched to meet the then FAI pylon rules - balances at 36.6% chord. Apologies for poor scan quality... Al Greenwoods F1 racing model (nearer scale) shows balance point at 42.4% Thanks Ian! Yes I meant the point where the wing's LE intersects with the fuselage side. I've just had a quick measure up and my projected 28%MAC equates to 42.37% of the root chord - almost the same as Al Greenwoods model. Spooky, or what? Still, it would indicate that I'm on the right track! Pete, thanks for the vailidation! tim Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted March 4, 2010 Author Share Posted March 4, 2010 Needs more red, right? tim Quote Link to comment Share on other sites More sharing options...
IanN Posted March 4, 2010 Share Posted March 4, 2010 Which colour scheme are you using - the yellow or silver wings? Glad that the balance looks good. And one q I meant to ask earlier - how are you linking the t-tail elevator to the servo? pushrod, or snake? Quote Link to comment Share on other sites More sharing options...
batcho99 Posted March 5, 2010 Share Posted March 5, 2010 The model looks great Tim. It also looks like its going to be extremely slipery in the air! keep up the good work. Iain. Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted March 5, 2010 Share Posted March 5, 2010 Just a thought, have you got any washout on those wings, if not, be ready for a tipstall. Quote Link to comment Share on other sites More sharing options...
IanN Posted March 5, 2010 Share Posted March 5, 2010 Good point. The full size one had those tips turned slightly upwards Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted March 5, 2010 Author Share Posted March 5, 2010 Ian, I'm going for the earlier red/silver scheme. Red and yellow look a little too much like a model aeroplane! Peter, As Ian has pointed out the full-sized Rivets had reflexed wingtips, which the model will emulate. Just a matter of cutting them loose, and re-attaching at a slight angle. As for the elevator, I've made the fin out of 1/4" sheet - thick enough to take a groove in one side for the micro snake I'm using. tim Quote Link to comment Share on other sites More sharing options...
kc Posted March 5, 2010 Share Posted March 5, 2010 Here is a photo of a plane at Chino Planes of Fame museum which I think is the same as Rivets. You can just see the tiny amount of angle on the wingtip. Quote Link to comment Share on other sites More sharing options...
IanN Posted March 5, 2010 Share Posted March 5, 2010 That one's called Sump n'Else. Obviously v closely influenced by Rivets, but different in some details Although I was already aware of that plane, I don't know its history. Quote Link to comment Share on other sites More sharing options...
kc Posted March 5, 2010 Share Posted March 5, 2010 I was not sure it was the same design, but it looks very similar!There was a plan for a 26 inch span Rivets in RCME May 1984. This had a 6.5 inch chord at root and the CG was shown at 2.5 inch back from LE at fuselage. No dihedral except flat on top of the tapered wing. The design is by "RCME staff " which might be David Boddington. Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted March 5, 2010 Share Posted March 5, 2010 Sump'n Else has a similar sort of fuselage and tail but the wing is completely different., A much more normal wing with equal taper and not nearly as tapered. Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted March 5, 2010 Author Share Posted March 5, 2010 Posted by kc on 05/03/2010 18:50:04:There was a plan for a 26 inch span Rivets in RCME May 1984. This had a 6.5 inch chord at root and the CG was shown at 2.5 inch back from LE at fuselage. No dihedral except flat on top of the tapered wing. The design is by "RCME staff " which might be David Boddington. I know! That was the original inspiration for my model! 26" span, no throttle and a screamin Cox .020 up front! Thanks for the info on 'Sumpin Else' though. I wasn't aware of that one..... tim Edited By Tim Hooper on 05/03/2010 21:06:51 Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted March 9, 2010 Author Share Posted March 9, 2010 Some more progress! The model is covered in the 'earlier' scheme of red and silver, and I'm going to see if it flies before I tackle all those fiddly little registration markings. With the wings at zero-zero, I've used a set square to set the tailplane incidence. Pilot Bill is now esconced in his cockpit. Finally a shot of the full-sized aeroplane. Big, isn't it? Quote Link to comment Share on other sites More sharing options...
IanN Posted March 9, 2010 Share Posted March 9, 2010 Yep, almost looks like they just got it out of the car boot Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted March 14, 2010 Author Share Posted March 14, 2010 Thanks for the pics Ian! It really was a cool little aeroplane, wasn't it? Anyway, here she is - ready to fly! AUW is 29oz. I'll worry about the details (panel lines and markings) after I find out if she flies.... tim Quote Link to comment Share on other sites More sharing options...
Stephen Grigg Posted March 14, 2010 Share Posted March 14, 2010 Really interesting thread Tim Quote Link to comment Share on other sites More sharing options...
Tim Hooper Posted March 19, 2010 Author Share Posted March 19, 2010 It flies!!! I took advantage of a small weather window this afternoon, and headed down to the field. With range checks complete, I taxied the model out to the middle of the grass strip, did a complete turn in each direction, lined up into wind and then steadily opened up the throttle. Rivets accelerated rapidly in a dead-straight line, and after about 20 yards I let the model leave the ground and head skywards. From the instant it took to the air I knew it was 'right' - you know the feeling? True it needed a click of up trim to keep it level, and it's apparent that the elevator is a little too enthusiastic in its operation (nothing a reduction in throw won't sort out), but this is going to be one 'groovy' model. It goes exactly where its pointed, and at quite a high rate of knots too! As it headed off downwind, though, the elevator started to glitch quite severely, so after a series of quite spectacular aerobatics, I managed to close the throttle and, having plenty of height in hand, let the model glide back to the strip. Flaring out saw the model land in a textbook 3-pointer - much to my relief! So there we have it. What I need to do now is to fettle the radio installation a little (move the rx. further from the ESC), and have a think about adding the markings. Hopefully, we'll get some pics next time out...... tim Quote Link to comment Share on other sites More sharing options...
IanN Posted March 19, 2010 Share Posted March 19, 2010 Great stuff. Now that I've finished the Hoehnia build I'll be turning back to my i.c. Rivets. Sounds like your balance worked out fine. I'd be interested in knowing your final aileron and ele movements, when you've settled on themEdited By IanN on 19/03/2010 22:28:02 Quote Link to comment Share on other sites More sharing options...
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