Jayselle, Mine seems to be very stable. The O.S. is heavier and I have a 13 x 6 prop on it. I love the 4 stroke 70 on it. Tons of power but managable. I haven't moved the battery aft yet so I put some weight under the tail and had to put some on the outboard of the left wing to balance it. Also, I got rid of the metal motor mount and put on a Dave Brown composite. Good luck with yours. I'm having a blast with mine.