THUNDER TIGER PRO Series Instructions Manual page 5

the silicone tube that may cause it to split or crack.
■Glow Plug
Use 4-way wrench to screw the glow plug into your engine and do not over tighten. Be sure to
put the glow plug washer between the cylinder head and glow plug to eliminate gas leakage.
■Propeller
Fix the propeller and spinner firmly to the engine. Screw the propeller slowly to the crankshaft
of your engine in a clockwise direction until resistance is first felt as the piston nears TDC (Top
Dead Center). Turn the propeller so that the blades are set at the 2 and 8 clock positions and
use a 4-way wrench to tighten the propeller nut.
Engine PRO-36 PRO-40 PRO-46
Break-In 10x5 10x6 10x6
Normal 10x6 10x6 10x7
Caution-It is extremely important to check the balance of your propeller before attaching it onto your
engine. An unbalanced propeller can cause substantial damage to both the aircraft and the engine!
Break In/Run In Procedures
Because your Thunder Tiger PRO engine has been precision-made from quality materials and
is an ABN (Aluminum Piston, Brass Cylinder with Nickel Coating)-type engine, a prolonged
break-in period is not necessary. In fact, after a tank or so on the ground, your engine can be
flown to break it in. The break-in period can take place on your model or on a test stand.
Many companies offer good quality, low cost engine test stands, should you choose to bench-
run your engine prior to installation in the aircraft. Never use a vise to hold an engine for
PRO-61 PRO-91 PRO-120 PRO-120-RP
11x6 13x8 14x8 14x10
11x7 13x9 15x8 16x8
6
break-in as this can distort the crankcase and ruin your engine. No matter where the breaking-in
is done, you can break-in your engine as follows:
■Fuel Selection
We strongly recommend a fuel containing 20% castor/synthetic blend with no more than 10%
nitromethane be used for break-in. We strongly discourage using fuel containing only synthetic
lubricants during the initial break-in period. The break-in period can take place on your model or on a
test stand.
Caution 1-Methanol and nitromethane are poisonous and highly flammable. Keep out the reach of
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.
Caution 3-Enclosed cowlings look great but can harm your engine if not constructed for proper airflow!
A general "rule of thumb" is to allow twice the area of air exiting the cowl as entering it (i.e. if your cowl
has 4 sq. in. of inlet area, it should have 8 sq. in. of exit area). The above guidelines are particularly
critical when using fuels containing only synthetic lubricant.
■Install the Propeller
Refer to the chart included in this manual to determine the proper propeller size for break-
7