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Thunder Tiger

Pro Helicopter Engines

PRO .39H Ringed
Thunder Tiger PRO PRO .39H Ringed
Displacement: 0.394 cu in (6.45 cc)
Bore: 0.850 in (21.6 mm)
Stroke: 0.693 in (17.6 mm)
Crankshaft: UNC 1/4 - 28
Practical RPM: 2,000 - 22,000
Output: 1.35 hp @ 18,000 RPM
Weight w/o muffler: 10.22 oz (290 g)

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