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Old 08-23-2012, 05:44 AM   #1
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Default Question on C.G. on a HZ Super Cub

Hello All,
I just finished converting my stock HZ Super Cub to Brushless after a crash that broke the stock motor mount. I put in a set up from Heads up. a Emax BL2220/07 motor and 9x4.5 prop, a HURC 30amp ESC, a OrangeRx Receiver with satelite receiver and a 3s 2200 lipo. Still using the stock servos. but the stock plane C.G was 2.125" from the leading edge of the wing. Now its nose heavy at 2.125" it balances at 1.90625" from the leading edge of the wing. will it hurt to fly the HZ Super Cub being this nose heavy?

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Old 08-23-2012, 08:49 AM   #2
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When your plane i nose heavy like that, you will have to put up trim on the elevator to force the back end down to keep the plane from losing altitude.

You are a little less than 1/4" nose heavy on a 48" wing so it will probably fly ok but it will feel more aerobatic if you can get the CG correct, don't get tail heavy, that's when a gentle plane turns into a monster.

Try to move your battery towards the rear to get back to the correct balance point.
The effect of the up trim is about the same as carrying extra weight. if nothing can move. maybe a smaller battery will help.

Good luck & happy landings.

Dave R, KI7MTA Proud PGR rider.
When you have flying skills like mine,
You become a master at repair.
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Old 08-23-2012, 03:03 PM   #3
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"A nose-heavy plane may fly poorly. A tail-heavy plane flies once".

So, try it, it may be fine, might even handle wind better (gusts and turbulence).

Ask me why your DX5e is doomed... and how to fix it.
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Old 08-26-2012, 05:34 AM   #4
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My SC flew okay with lots of up trim, elevators definitely deflected up. Taped enough lead in the tail to make it fly without trim, and it handles beautifully. I suppose the forward c/g is for beginners (see CNY Dave's quote)...
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