Figure 11: Blade And Spinner Fasteners - Bergey Tilt Tower Installation Manual

wiring and then test the polarity with a Volt-Ohm-Meter. Turning the alternator by hand
will provide enough voltage to make this check. Carefully mark the positive and nega-
tive electrical leads for later reference.
Step 5:
Turn the EXCEL1 powerhead so that the alternator is facing up. Attach the blades as
shown in Figure 11 using the M10 hardware provided. Insert bolts and start all three
blade nuts. Then, partially tighten the nuts in the order shown in Figure 12. We rec-
ommend bolting one blade up solidly and leaving the other two somewhat loose while
you check the tip-to-tip blade distance. We recommend checking, and adjusting as
necessary, the blade tip spacing to ensure that the blade tips are equally spaced. This
step will help make the wind turbine as smooth running as possible, which will maximize
the operating life of the bearings and reduce vibration related noise. The blade tip-to-tip
distances should not differ by more than 1/2" for smooth operation. Finally, torque the
nuts (in order shown in Figure 12) to 45 ft-lbs each. Loctite is not necessary on the
blade fasteners because the nylon locking nuts provide adequate locking.
NOTE: For EXCEL 1's shipped after September 2003, all of the blade bolts are
the same length.

Figure 11: Blade and Spinner Fasteners

Spinner
Fasteners
Blade Nuts &
Washers
Longer bolt
goes here
Blade Bolts
26