O.S. 50SX-H Hyper Ringed .50 Helicopter Engine

Tower Stock# OSMG1951  •  Manufacturer Stock# 15550
O.S. 50SX-H Hyper Ringed .50 Helicopter Engine (large view)
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Notes from our tech department:
This is the O.S. Max .50 SX-H Ring Hyper Helicopter Engine with
Hyper Cooling Head and 60LH Carburetor.


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
Two year limited warranty
Same mounting dimensions as the O.S. Max .46FX-H


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


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


Output: 1.9 PS, 1.87 HP/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 backplate bolt: 1" (25mm)
Distance from center of engine to throttle lever: 1.5" (38mm)

Needle Settings: High Speed: 1.5 turns out from fully closed
Mixture Control (low speed): indentation on screw
head straight vertical (up and down)
jxs 8/06/04
updated carb info tjt 020305
updt lmm 4/14/09



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