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Biplane C of G


David Holland 2
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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

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