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Building Tips and technical articles. => 1/2 A building. => Topic started by: Dwayne on January 26, 2010, 09:38:48 AM
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D>K Another blah winter day so what's a guy to do, why go through some old mags. I came across a 1999 FM and there I found Dick Sarpolous' 1/2A P51 so I got out the calculator and paper and soon I had a set of plans, I'm going to power it with a Cox sure start and HiPo P/L from Cox international and a Merlin head, should be alot of fun.
Thanks
Dwayne
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P/L?
I have a Cap 232 that I scaled from an average of several Sarpoulis designs -- 25" span, 125 square inch area, about 7.5 ounces (after many repairs).
It is way too big and way too heavy for the Cox reed valve engines I have, at least if you want to do anything but go in a circle (good trainer, though). I'm currently building something much smaller (~95 squares, maybe 5 ounce max) just so it'll loop!
Consider that when you're building. I don't know, but I suspect my biggest problem is weight -- 7.5 ounces is pretty porky.
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Put a TeeDee on those designs and see the difference. I think the Brodak .049 would work better than the reed valve engines also.
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Hi Tim
P/L is piston&liner or I guess in this case cylinder, anywho the one from Cox international is supposed to add up to 20% more rpm to a stock sure start and I'm also going to use a Merlin head adapter wich is supposed add 500 to 1500 rpm, we will see...
Thanks
Dwayne