OWNER'S MANUAL POWER JET Rev. 1.0
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26
7.2 Prop Care
Avoiding Prop Damage
It is very easy to damage the propeller by sucking up dirt or rocks when running the motor on the
ground. To avoid this, either place the unit on a sheet of plywood or something similar, or use a nice
clean area such as a nicely mowed yard. An alternative is to strap the motor on and start it in the
standing position.
Prop Balancing
Balancing of the propeller is very critical. The prop blades are subjected to forces as high as 2000 G’s!
Therefore, a weight difference on the propeller tips of only 1 gram can cause forces as high as 2kg.
This force will cause a vibration at the speed of the propeller RPM, and can cause enough vibration to
break welds or tubes of the frame. Therefore, a balanced propeller is of the utmost importance.
Keeping the Prop Clean
Wipe all dirt and oil from the prop when finished flying. Oil, if left on the prop for long periods of
time, can seep into the wood and cause an imbalance.
Store the Prop Horizontally
When storing the paramotor, rotate the prop to a horizontal position. This is because if the prop is
stored vertically, moisture and oils in and on the prop can migrate downward and cause prop imbalance.
This phenomenon can only happen on wood props.
7.3 Spark Plug
The recommended sparkplug for the Top 80 motor on the PJ125 is the B9ES. The “resistor” version of
this plug, the BR9ES is also recommended, and is particularly helpful at reducing interference on radios
or music devices.
Spark plug gap is 0.025” (0.635mm). Recommended cleaning and gapping interval is every 25 hours.
Recommended replacement interval is every 50 hours.
7.4 Repairs
Minor repairs can be performed on the prop, cage, cage guard, and harness. Major repairs should be
performed by a trained service technician, or by FLY PRODUCTS.
FLY PRODUCTS provides full repair services including frame, prop, harness, and engine repairs. FLY
PRODUCTS also carries all parts and supplies to keep your POWER JET in top operating condition.
Caution! Repairs to the harness or any stress-carrying areas of the POWER JET should only be
performed by a certified parachute rigger. If in doubt, contact FLY PRODUCTS.
