OS FS155a (Pumped)

Displacement 25.36cc/1.548cu.in. Bore 33.6mm/1.323in. Stroke 28.6mm/1.126in. Output 2.6ps/2.56hp/10,000rpm Practical RPM range 2,000-10,000rpm Propellersize Sport・Stunt : 16×8-12,17×8-12 Engine Weight 805.0g(28.40oz)