THUNDER TIGER PRO-39H(R) Instructions

THUNDER TIGER PRO.H
RING TYPE SERIES ENGINES
INSTRUCTIONS
PRO-90H(R) / 9609 SHOWN

INTRODUCTION

Congratulations on your purchase of a Thunder Tiger model
engine. ALL the latest Thunder Tiger series engines have been
designed to combine the high performance with easy handing
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.
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.

IMPORTANT

This engine will provide you with years of safe use, provided
that you carefully follow these safety instructions:
1. This model engine IS NOT A TOY, but a powerful miniature
engine that is capable of inflicting damage to both people and
property if misused.
2. Always mount the engine securely in a test stand or high-quality
engine mount. Never, never attempt to clamp your engine in
a vise!
3. Make sure that you use the suitable size engines and rotors
for your helicopter that followed the recommend of helicopter
instruction manual.
4. Make sure that the installation of the clutch/cooling fan system
on the engine is securely fastened and correctly. Unsuitable
installation will cause huge vibration during helicopter flying.
5. Do not run your engine around dirt, sand or loose gravel. Such
material can be thrown into your eyes by the propeller. In
addition, the engine can be damaged by these materials entering
the carburetor.
6. Take care to keep all loose clothing, rags, tools, etc. away from
the rotors.
7. Take care when handling your engine after running. Model engines
get very hot during operation!
8. Always operate your engine with proper ventilation. Model
engines produce toxic fumes when run in a closed room or
confined area.

SPECIFICATIONS

ENGINE ITEM Displacement Bore Stroke
NO (c.c/cu.in) (mm/in) (mm/in)
PRO-39H(R) 9604 6.45 / 0.394 21.6 / 0.850 17.6/ 0.693 UNC 1/4-28 2,000~22,000 1.35/18,000 290/10.22
PRO-50H(R) 9605 8.27 / 0.504 22.5 / 0.886 20.8 / 0.819 UNC 1/4-28 2,000~20,000 1.75 / 17,000 405/14.28
PRO-70H(R) 9607 11.49 / 0.701 25 / 0.984 23.4 / 0.921 UNC5/16-24 2,000~18,000 2.25 / 16,000 570/20.10
PRO-90H(R) 9609 14.78 / 0.902 28 / 1.102 24 / 0.945

INSTALLATION

Dimensions
ENGINE A (mm/ i n ) B (mm/ i n ) C (mm/ i n )
P RO -3 9H (R ) 7 4 . 5 / 2 . 9 3 5 3 . 0 / 2 . 0 9 7 6 . 8 / 3 . 0 2
P RO-5 0 H(R ) 84 . 9 / 3 . 3 43 60 . 3 / 2. 3 7 4 86 . 4 / 3. 4 0 2
P R O-7 0 H( R ) 83. 1 / 3.272 55.5 / 2.185 101.9 / 4.012
P R O-9 0 H (R ) 83. 1 / 3.272 55.5 / 2.185 102. 3 / 4. 0 2 8

NECESSITIES

The following items are necessary for operating the engine, these
are available at you hobby dealer.
FUEL
A good quality, commercially available fuel containing 25% lubricant
and 75% methanol is recommended for break-in /run-in and
general usage. We also recommend castor oil or a castor /synthetic
blend only for use as a lubricant. Fuel containing 5%~30%
nitromethane and 20% lubricant is for use when more power is
required. Most fuels containing synthetic lubricants (only) are
much less tolerant of a lean run compared to fuel that contains
castor oil. If availability or local conditions force you to use a fuel
that contains only synthetic lubricant, we suggest that you keep
your needle valve set to a slightly richer setting, allowing more
lubricant to flow through your engine to extend engine life and
maintain optimum reliability. Do not use fuel containing less than
20% lubricant.
CAUTION 1
Methanol and nitromethane are poisonous and highly flammable.
Keep out of reach from small children and keep away from heat
and open flame.
CAUTION 2
Excessive heat can greatly reduce the life of your engine. Most
of the heat generated by combustion is removed via the lubricants
that are contained in your fuel, and exits the engine as exhaust
vapor. As a precaution, you should periodically remove the muffler
from your engine and visually inspect the exhaust port and piston.
If the outer surface of the piston is stained a very dark color, it
can indicate that your engine may be overheating. This can be
caused by either an excessively lean needle setting or a lack of
airflow across the cylinder and head.
Crankshaft Practical OUTPUT Weight
Thread RPM (BHP/RPM) (g/oz)
UNC5/16-24 2,000~16,000 2.75 / 15,000 575 /20.28
Engine
Mou nt your eng ine
securely to rigid engine
mount. Make sure the
mounting surface are
ab solu te ly fla t a nd
parallel to avoid engine
distortion (bearings,
crankcase...) and power
loss.
D (mm/ i n ) E (mm/i n ) F (mm/ i n ) G (mm/ i n ) H (mm/in)
6 1 . 0 / 2 . 4 0 1 5 . 0 / 0 . 5 9 3 8 . 0 / 1 . 4 9 31 . 0 / 1 . 2 2 4 3 . 4 / 1 . 7 0 9
69.1 / 2. 7 2 17. 5 / 0.689 44 / 1.732 3 4 . 0 / 1 . 3 4 45.61. 7 95
80.1 / 3.154 25 / 0 . 9 84 52 / 2. 0 4 7 4 3 . 0 / 1 . 6 9 5 6 . 6 / 2 . 2 2 8
80. 5 / 3.169 25 / 0 . 9 84 52 / 2. 0 4 7 4 3 . 0 / 1 . 6 9 5 6 . 6 / 2 . 2 2 8