1. Static imbalance. One blade
is heavier than the other.
- For carbon fiber
props, if they have been submerged or exposed to moisture, the interior
foam may hold some water, making them off balance. Balance and let dry.
2. Aerodynamic imbalance. This
is where one blade is producing more thrust than the other. Causes may be:
- Prop is on laterally
crooked such that one blade has a higher angle of attack than the other.
- One blade has is larger
than the other.
- One blade has been
sanded down so that it has a higher angle of attack than the other.
- One blade is warping
under air loads. This is more probably with weaker woods or thin (flat)
3. Prop is cracked. If you are unsure about
fixing props it is far better to send it someone who is. Separating
blade parts could be lethal! Among many methods to repair such prop, (as
long as the crack does not go through the Hub) is to epoxy the damaged
area, filling void's with urethane filler (about the same density as
wood) and then cover the whole prop in Fiberglass, Unless it is just a
small crack then cover it and opposite blade with glass to balance.
Suggestion from John Fetz.