O.S. leads the way in advanced 4-stroke engine technology, and you’ll see for yourself when you mount the FSa-72II in your model! Sport flyers will enjoy greater performance, while scale pilots will experience more realistic flight. Plus, everyone will benefit from the FSa-72II’s deep, rich sound.
The adjustable F-5030 muffler can be rotated 360° and moved in or out for a perfect fit. Rich, deep sound is an added benefit.
Features the same mounting bolt pattern as the FL-70 and the FS-70 Ultimate for easy replacement.
A reversible carb and narrower camshaft housing simplify installation.
Tighter tolerances and updated engineering reduce maintenance and ease set-up.
Delivers more performance power to sport pilots and more realistic flight to scale pilots.
O.S. 61N rotary, 2-needle, extended intake tube
0.719 cu in (11.79cc)
Engine (Only) Weight
16.79 oz (476 g)
1.2PS, 1.18 HP @ 12,000 rpm
1.9 oz (54g)
O.S. type F
4.2 in (108 mm) bottom of crankcase to top of rocker cover