Thunder Tiger CORP. -- PRO-39H(R) NO.9604


Item No. 9604
Displacement(c.c. / 6.45 c.c. / .394 
Bore(mm / in.) 21.6 mm / 0.850 in. 
Stroke(mm / in.) 17.6 mm / 0.693 in. 
Practical R.P.M.(R.P.M.) 2,000 ~ 17,000 rpm 
Output(BHP/RPM) 1.35 BHP / 16,000 RPM 
Weight(g/oz) 290 g / 10.23 oz 


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


The Pro series helicopter ring-type engines are equipped with dual ball-bearings, Schnuerle porting, one ring-type piston / cylinder assembly and two-needle automatic mixture control carburator.

The Pro-39H delivers smooth power for sport and 3D pilots alike and delivers smooth power at your demand. With a displacement at .394 cubic inches, the Pro-39H is the largest displacement engine available in the popular 30-size helicopter class, and directly fits in all popular machines. Precision air bleed carburetor makes adjustments simple, and efficient mufflers keep things quiet at the field.

The Pro-39H works best in helicopters with gear ratios ranging from 9:1:1 to 9:8:1, and develops peak horsepower at 16,000 to 18,000 rpm.


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 cooling fins
Dual ball bearing-supported crankshaft
Vertical fins heat sink head for optimum air cooling
Lightened hypereutectic machined Al-Si ringed piston
Rear reinforced resin cage ball bearing support
State-of the-art CNC machined components
2 Needle valves carburetor






Spare Parts List