nun45
New arrival
Posts: 11
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cg help
Apr 11, 2005 19:58:13 GMT -7
Post by nun45 on Apr 11, 2005 19:58:13 GMT -7
if anyone is familiar at all with a pushy-cat, i need some cg help. i flew mine for the first time yesterday and it flew like an extremly tail heavy bird, but i do not know the cg. any help is appreciated.---henry
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Grnbrt
Story teller
Help help, I'm being......................darn, forgot what I am being!!!!
Posts: 260
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cg help
Apr 11, 2005 22:52:01 GMT -7
Post by Grnbrt on Apr 11, 2005 22:52:01 GMT -7
Well Henry if you can't find the info you need just do what I do. the plane is flyable from the sounds of it so add about 2Oz of weight to the nose and then carefully fly and see how it goes, if needed add or delete some weight and soon you will have a nice flying plane. I have had to this before and a bit rough on the nerves but when in a pinch you do what you can, good luck and hope you find the CG.
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cg help
Apr 12, 2005 9:08:55 GMT -7
Post by Britbrat on Apr 12, 2005 9:08:55 GMT -7
A safe starting point for the C-of-G sould be 25% of the MAC, but 20% to be on the safe side may be better in your case -- and work on it from there.
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nun45
New arrival
Posts: 11
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cg help
Apr 12, 2005 19:20:52 GMT -7
Post by nun45 on Apr 12, 2005 19:20:52 GMT -7
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cg help
Apr 13, 2005 7:14:44 GMT -7
Post by Grug - American Neanderthal on Apr 13, 2005 7:14:44 GMT -7
Even though the Pushycat is odd, its still a straight wing configuration and a 20%- 25% start point should work. What's it at now?
It may be its just sensitive to pitch since is so short. Was it trying to tip or spin? Maybe put 4 oz of sticky weight up front and see if it makes a difference.
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cg help
Apr 13, 2005 13:26:10 GMT -7
Post by Britbrat on Apr 13, 2005 13:26:10 GMT -7
A short-coupled design like the Pushycat will have a narrow band of acceptable C-of-G movement. Too far aft is seriously fatal, but too far forward will be nearly as bad. There is insufficient trim moment to hold the nose up at low speeds (LANDING!!!!) if you get the C-of-G too far forward, & you will be stuck with trying to land at very high speed.
Since you can actually fly it now, I suggest that you start adding nose weight, 1/4 oz at a time, until it behaves acceptably.
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nun45
New arrival
Posts: 11
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cg help
Apr 13, 2005 19:14:50 GMT -7
Post by nun45 on Apr 13, 2005 19:14:50 GMT -7
with all the great advice i got here it has been brought to my attention that i may not have a cg problem, but instead i am fighting engine thrust! i have been advised to vector some down thrust. so i may just start there. again i wish to thank y'all for some great advice that i am sure will be handy in the future.---henry
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