I installed a OS160 in my H9 cap, and installed the servos in the standard location. I used a 5 cell 1400mah pack and installed that above the fuel tank, and it balanced perfectly with no lead added. The plane weighed in at 12lbs. Now all I need is some good weather so I can log in some flight time with this bird, here in Ohio it is still cooooooold. I have 2 other new planes that need to be flown which are a GP 1/4 Giles with OS160 too, and a Kangke G300 with TT91 4 stroker. Man I cant wait for some good weather. Those guys living in Texas are really pissing me off being able to fly year around, you lucky Devils