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Hi Mike
if you're talking about a 'traditional' type of rubber powered plane, the first thing you'll need (as you'll probably know) is a pretty strong core to contain the rubber. I've only ever built one rubber powered model - many years ago from a commercial balsa and tissue kit. First flight veered to one side so needed trimming. Second flight a bit better. Third flight - maybe a few more turns on the rubber. Oops. Loud crunch as back end shot forward to meet front end. The crumpled mass was way beyond repair, but it was fun while it lasted!
This'll be an interesting challenge - designing a structure that's strong enough to handle the forces involved, yet light enough to actually fly. Good luck with it, will be following with interest.
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