RE: VMAR F-5 any experience
Many sites says this .....
OS 91FX SPECIFICATIONS:
Displacement: 0.912 cu in (15.0cc)
Bore: 1.091 in (27.7mm)
Stroke: 0.976 in (24.8mm)
Practical RPM: 2,000-16,000
Output: 2.8 bhp (ps) @ 15,000 rpm
Weight: 19.3 oz (550g)
Includes: Muffler, Safety Propeller Locknut Assembly, #8 glow plug
Requires: fuel, mount & prop
Recommended Propellers: 13x8-9
O.S. 75 AX Specifications:
Displacement: 0.75 cu in (12.3cc)
Bore: 1.02" (25.8mm)
Stroke: 0.93" (23.5mm)
Practical RPM: 2,000-16,000 r.p.m.
Power Output: 2.4ps/15,000 r.p.m.
Weight: 20.39 onuces (578g) w/o muffler
26.46 ounces (750g) w/ muffler
Recommended Props: 14x6, 14x8, 15x7
Crankshaft thread size: 5/16-24
Distance from center of engine to drive hub: 2.62" (66.6mm)
Height from crankcase bottom to top of cylinder head: 4.07" (103.5mm)
Height/crankshaft center to top of cylinder head: 3.20" (81.5mm)
Width including mounting tabs: 2.4" (61mm)
Width not including mounting tabs: 1.67" (42.6mm)
Width between mounting holes same side: .98 (25mm)
Width between mounting holes opposite side: 2.04" (52mm)
Diameter of muffler body: 1.92" (48.8mm)
Angle of muffler in relation to engine: 4 degrees