Thunder Tiger model engines are designed to combine high performance with easy handling and maintenance using modern CAD computer technology. Major components of the engines are machined from the highest quality materials using state-of-the art CNC manufacturing techniques, resulting in consistently high quality and reliability.
This manual covers the Thunder Tiger PRO.H ring‑type helicopter engines, describing their design, safety precautions and key specifications. It explains how to install the engine, adjust the carburetor, and perform routine care to ensure reliable operation.
Additional sections include detailed parts lists, warranty information, and service procedures, making it a complete reference for hobbyists and technicians working with the PRO‑30H, PRO‑50H, PRO‑70H, and PRO‑90H models.
| Displacement (c.c.) – PRO‑90H | 14.78 |
|---|---|
| Bore (mm) – PRO‑90H | 39 |
| Stroke (mm) – PRO‑90H | 24 |
| Practical RPM – PRO‑90H | 2,000~19,000 |
| Weight (g) – PRO‑90H | 575 |
The manual warns that the engine is not a toy, must be mounted securely on a rigid stand, kept away from loose clothing, and operated only with proper ventilation and suitable fuel.
Adjust the needle valve and mixture metering screw in small increments (no more than 15‑30° for the needle valve and 30‑45° for the screw) to balance rich and lean settings across low, middle, and high speed ranges.
Run the new engine in a rich condition for at least six tanks of fuel, ensuring it does not overheat and is operated in a clean, dust‑free area.