Manufacturer Description

Align MADE IN JAPAN Hyper engine for superior 50 size helicopter. The Hyper version features light-weighs, but delivers more horsepower for higher rotor speeds. Actually mounts in the same space as a 30-size application. Besides good looks and excellent cooling, this engine is machined blue alumite heat sink head also boosts combustion efficiency for more power stability.
Specifications:

Displacement: 8.17cc (0.499 cu in)
Bore: 22.0mm (0.866 in)
Stroke: 21.5mm (0.847 in)
Practical RPM range: 2000-20000 RPM
Output: 1.9hp/17000RPM
Weight: 406g (14.33 oz)