April 2006
SOUTHWEST WINDPOWER
40
Document #0023 Rev C
Whisper 500 Battery Charging Manual
Mark the heaviest
blade balance point
on the other blades.
Use the lead weight to adjust the lighter blade’s
balance point to equal the heaviest one.
Balance point of heaviest blade
Balancing Blades
1. Set round side of blade on knife edge with leading edge
parallel to table. Mark the balance point precisely.
2. Weigh each blade separately (use a grocery store scale)
and mark weight on each blade.
3. Cut one (or two) sheet lead weights equal to the
difference in weight between the heaviest and the other
blade (or blades).
4. Measure the balance point of the heaviest blade from
the butt end and mark this BALANCE POINT on the
other blade or blades.
5. Place the lighter blade or blades back on the knife edge
at the BALANCE POINT of the heavier blade. Locate the
balance weight lengthwise until the blade balances. You
now have two blades of identical weight and center of
gravity (balance point).
Balance point
