I got these floats at a swap meet and were told they came from nitroplanes. com. My plane weighs 9 lbs 12 oz and has a OS 70 Surpass. I use a 12x8 prop and it will come off the water as soon as it planes out. Approx 50 ft. Use about 35% aileron-rudder mixing once airborne. Saito FG 21 should do OK.