Aerovent IM-111 - Manual

BackSwept Propeller
©2012 Aerovent
Blade Angle Adjustment
Blades are set to the specified blade angle at the
factory. If adjustment in the field is required, use the
following method:
1. Lay the hub on a horizontal surface with the
concave (air leaving) surfaces of the blades facing
upwards.
2. Loosen the blade retaining bolts until they are
finger tight. At this point, the blades should rotate
in their sockets when grasped firmly and twisted,
but should not turn on their own.
3. Place an angle meter or protractor across the two
blade angle position marks on a blade. See Figure 1.
4. Twist the blade to the desired blade angle.
5. Repeat steps 3 and 4 for the remaining blades.
6. Re-tighten the blade retaining bolts to the torque
shown in Table 1, making certain that the blades
stay positioned at the desired angle. Work in a
star pattern, working your way up to the desired
torque in steps. Tightening one bolt to the full
torque before moving on to the next can crack
the hub.
Mounting the Propeller Assembly on the
Shaft
The BackSwept Propellers are furnished with hubs
that have a tapered bore. A split-tapered bushing
is used for mounting the propeller assembly to the
shaft. When properly assembled, the bushing grips
the hub and the shaft with a positive clamping action.
See Figure 2.
 The bushing barrel and the bore of the propeller
hub are tapered. This assures concentric mounting
and a true running propeller.
‚ The cap screws, when tightened, lock the bushing
in the propeller.
ƒ The bushing is split so that when the locking cap
screws force the bushing into the tapered bore,
the bushing grips the shaft with a positive clamp-
ing fit. This will withstand vibration and punishing
loads without loosening.
„ The propeller and bushing assembly is keyed to
the shaft and held in place by compression. This
gives added driving strength.
General Installation, Operation and Maintenance Instructions For Aerovent Products
IM-111
January 2012
®
Table 1
HUB SIZE
BLADE BOLTS
N/m (ft. lbs)
HUB BOLTS
N/m (ft. lbs)
150mm (6") 5.5 ~ 8 (4 ~5.9) 10.7 (7.9)
225mm (9") 5.5 ~ 8 (4 ~5.9) 21.7 (16)
255mm (10") 30 (22) 21.7 (16)
350mm (14") 30 (22) 39.3 (29)
Figure 1
Figure 2
WARNING
Disconnect power before installation and
maintenance. Failure to do so can result in
severe injury or death.