Hi all,
I was wondering what your opinions are on the engine I am planning to put on a new 40 size gp extra - An OS 50SX (1.8 hp and 13.8 oz). Will this be enough? I have read elsewhere in these threads that this is considered a heavy plane at 5.75 lbs.
Any opinions on engine size would be welcomed. Thanks!

The OS50 will be plenty of power to pull the Extra around... it's an old design so that's why they are a little heavy. They are good flying airplanes...

I agree. The GP extra is a heavy plane. mine has a saito 100 and weighs over 6.5 pounds. The take offs are thrilling, but the landings are treacherous with that wing and high loading. If you decide to do it keep this plane as light as possible. Mine has standard servos and 1200 Ma battery. I may end up redoing the radio gear to save some weight. using HS81 servos for throtle, HS 225's for everything else and NimH battery saves over 1/4 pound, but it still will be relatively heavy.


A friend has one with the K&B 48. flies fine on that (although his is probably a little heavy too). I have an OS 50 on an SE. Excelent engine and a great combo. If you don't already have the GP 300, try the SE. It is 4.5 pounds of pure fun.

i have the gp extra 300 40 size. i put an 46fx on it. flyes fine. plenty of power. is a good plane.
tyler

I have one. I put a Magnum .91 4s in mine. Flys and sounds great. As said above though you have to fly it in to land it. It is a great flying airplane. One of my all time favorites.