Engine	H- 39H(R)
Displacement	6.45 c.c. / .394 cu.in.
Bore	21.6 mm / 0.850 in.
Stroke	17.6 mm / 0.693 in.
Practical R.P.M.	2,000 ~ 17,000 rpm
Output (BHP/RPM)	1.35 / 16,000
Weight (g/oz)	290 / 10.23

The PRO series helicopter ring-type engines are equipped with dual ball-bearings, Schnuerle porting, one ring-type piston / cylinder assembly and two-needles automatic mixture control carburetor. Thunder Tiger’s .39 helicopter engines provide the smooth power for your demand. Displacement at .394 cubic inches is the largest displacement engine available in the popular 30-size helicopter class, and directly fit in all popular machines. Precision air bleed carburetor makes adjustments simple, and efficient mufflers keep things quiet at the field.

The XC2 (extreme composite coating) cylinder liner with special criss-cross pattern etched.
High strength connecting rod with bushings pre-installed.
One-piece crankcase with squared-off shape cooling fins.
Dual ball bearing-supported crankshaft.
Vertical fins heat sink head for optimum air cooling.
Lightened hyperutectic machined Al-Si ringed piston.
Rear reinforced resin cage ball bearing support.
State of the art CNC machined components.
2 Needle valves carburetor.

1. PRO-39H engine x 1 EA
2. Carburetor Assembly x 1 EA
3. Allen wrench x 3 EA (2.5mm ＆2mm ＆1.5mm)
4. Instructional manual x 1 EA
5. TT logo sticker x 1 EA

Instruction Manual
Parts Catalog
9604-catclog (2 MB)