O.S. Max 25 FX Aircraft Engine w/Muffler

 

This is a New High-Performance .25 FX. This Engine may be used in Sport and Aerobatic Aircraft.

 

FEATURES:

Remote Needle Attached to the Backplate keeps fingers away from prop

Twin Ball Bearing-Supported Crankshaft

Schnuerle Porting (Schnuerle scavenging)

Advanced Bi-Metallic Liner. This process uses a double layer of plating material, rather than one thicker layer. This helps the metal to bond to the cylinder, and is more durable. Also, the plating process is more consistent, resulting in a more precise fit between piston and sleeve, for better compression, longer life.

Side Exhaust

One-Piece Crankcase

 

INCLUDES:

One Expansion Style Muffler

One Set of Instructions, Decal

One Assembled .25 FX w/Carb

 

SPECS:

Practical RPM Range: 2,500 - 19,000 RPM

Displacement: 4.07cc (.2485 cu in)

Bore: 18.0mm (.708 )

Stroke: 16.0mm (.630 )

Horsepower: .84 BHP at 18,000 RPM

Weight: 248g (8.8oz) 10.8 oz w/muffler

Recommended Props: Pattern Flying: 9X5, 9X6

Pattern Flying if a tuned pipe is used: 9.5X5

Sport Flying: 9X5, 9X6, 9.5X5, 10X4, 10X5