David Holland 2 Posted February 1, 2021 Share Posted February 1, 2021 It must be the lockdown but I've been faffing about up in the loft where nearly but no quite dead models languish. I have come across a really pretty little biplane, about 36in span fitted with an OS 25Max and Futaba M series gear and weighing about 4 lbs(!). I've no idea where it came from, I don't remember building it or buying it and I haven:t flown IC since the early 90's but it is very pretty, in remarkably good nick, only needing a good clean and the covering tweaking with a hot iron here and there. I've stripped all the old gear out and am going to fit a 400ish watt outrunner, 3s2200 lipo and mini servos. I reckon I can get near to 3lbs ready to fly. My question is C of G. The bottom wing is straight with a little dihedral and the top wing is flat, forward staggered and swept back. The sweep is such that the tips of both wings align vertically. Do I take the average 25-30%ish chord at mid span, projected vertically down to the lower wing or is there some more complicated calculation to be done. Thanks in advance, David Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted February 1, 2021 Share Posted February 1, 2021 A picture Dave ? Someone likely knows what it is. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted February 1, 2021 Share Posted February 1, 2021 Google Precedent Bi-fly David You described one very accurately above Quote Link to comment Share on other sites More sharing options...
EarlyBird Posted February 1, 2021 Share Posted February 1, 2021 Will this help? Precedent Bi-Fly Quote Link to comment Share on other sites More sharing options...
EarlyBird Posted February 1, 2021 Share Posted February 1, 2021 And this one when you were younger John, here Quote Link to comment Share on other sites More sharing options...
David Holland 2 Posted February 1, 2021 Author Share Posted February 1, 2021 Yup, that's the badger. I had a feeling it was a Precedent kit and it does look very familiar. I might have built it but I really can"t remember. Anyway, the Bi-Fly thread says C of G mid chord of top wing which looks sensible so I'll go with that. Appreciate the help, chaps. David Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted February 1, 2021 Share Posted February 1, 2021 Posted by EarlyBird on 01/02/2021 21:05:03: And this one when you were younger John, here Lol, knew someone would. Quote Link to comment Share on other sites More sharing options...
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