Propeller  protection for ultralights and ultralight aircraft. GSC Propellers: Should there be a gap between my hub halves? Yes, the propeller hubs are designed to have a 30 thousandths gap when the round root end of the blades are placed inside. Do not torque bolts until the gap disappears. Torque to a maximum of 100 in/lbs. only! I can no longer see a gap between my hub halves. Should I be concerned? There should always be a slight gap. This design is to give a clamping action to the blades and not allow them to change pitch in flight. Our experience has shown that a lack of gap is usually the result of over-torquing. I have a propeller which is quite old. Can I replace just one blade? Yes, we can replace just the one blade. However, if the propeller is more than two years old, the new blade may not balance with the old blades and it will be necessary to return the old blades and have us balance the new blade to them. I seem to be getting a vibration from my prop, what do I do? Double check your tracking (tolerance of 1/8" at tip). Double check the pitch of your prop (variance from blade to blade should not be more than ½ degree). If propeller has been altered in any way, balancing may be necessary. If vibration still persists, it could be from another source, such as engine crankcase or gearbox. The GSC prop lifetime has been reported to be 5 years. For more information call GSC Systems.   

        

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