This is the O.S. Max .50 SX-H Ring Hyper Helicopter Engine with Hyper Cooling Head and 60LH Carburetor.

This engine is ideal for beginners or those looking for a more affordable power plant than the OS55HZ. While not having quite the top end power of the 55, this engine is a very cost effective solution for all 50 size helicopters. With greater fuel economy than the 55, it is also cheaper to run. Beginners will find this engine easy to tune and maintain.

FEATURES: 
* Ideal for use in any 50 class helicopter
* New head design offers improved combustion efficiency for stable hovering and aerobatic flight
* Large 0.39" (10mm) diameter carburetor intake for greater running stability
* Two year limited warranty
* Same mounting dimensions as the O.S. Max .46FX-H

INCLUDES: 
* (1) O.S. Max .50 SX-H Helicopter Engine with Hyper Cooling Head, 60LH carburetor (OSMG2469), decal sheet, #8 glow plug, instruction manual

REQUIRES: 
* 10% to 30% nitro Fuel with at least 18% lubricant (Helicopter Mix)
* Starting equipment

SPECS: 
* Output: 1.9ps/17,000 RPM
* Practical RPM Range: 2,000-20,000 RPM
* Displacement: 0.499 cid (8.0cc)
* Bore: 0.866in. (21.99mm)
* Stroke: 0.847in. (21.51mm)
* Weight: 14.33oz (405.4g)

* Distance/top of cylinder head-bottom of mounting ears: 2.9" (74mm)
* Distance between mounting holes same side: 0.68" (17.5mm)
* Distance between mounting holes opposite side: 1.73" (44mm)
* Distance between muffler mounting holes: 1.4" (37mm)
* Length of cylinder head: 2.1" (54mm)
* Width of cylinder head: 1.8" (47mm)
* Distance/bottom of crankcase to top of cylinder head: 3.6" (92.3mm)
* Distance from center of engine to front bearing: 2.0" (51.6mm)
* Distance from center of engine to back plate bolt: 1" (25mm)
* Distance from center of engine to throttle lever: 1.5" (38mm)