Aerovent IM-173 - Manual

Assembly Procedures
1. Lay hub on a horizontal surface with openings of shank
sockets (Fig. 3) facing up. This is normally the discharge
side of the assembly.
2. Lay blade shank in socket with discharge side of the blade
up. The discharge side of the blade is the side with the
angle setting mark. Line up the index mark on the blade
with the proper angle mark on the end of the shank socket
(Figs. 2 and 4) on the underside of assembly.
3. Place cap over blade shank with beveled end toward center.
Install U-bolts and elastic nut stops. Before tightening lock
nuts, pull the blade outward to set the key against the key-
way and check angle setting (Fig. 3).
4. Tighten elastic stop nuts evenly and torque to the following
foot-pounds:
5. Check angle setting to be sure it has not changed during
assembly. If so, loosen lock nuts and reset angle. Tighten
nuts again to proper torque. Do not over-tighten. Be sure
to tighten U-bolts evenly.
Setting Angle With Protractor (optional)
Under most conditions, the preceding assembly procedure
using the index marks is of sufficient accuracy. When greater
accuracy is desired, use a level bubble protractor. Before the
final tightening of the nuts, set the protractor on the angle
setting mark. (The hub and blade assembly must be level for
accurate setting.) Adjust the angle by tapping the shank end
with a mallet. Tighten lock nuts to proper torque. Again check
the angle setting. Rotate propeller to check angle on each blade
in the same location.
Propellers may be assembled so the cap side of the hub is
the inlet side (reverse bore). If blades do not have the index
mark on the discharge side, it is then necessary to adjust the
blade angle with a protractor.
The hub and blades are balanced separately. The weight
distribution throughout the length of the blade varies slightly.
Therefore, the balance is to a constant moment and blades
may be assembled at random even though the weights are
slightly different.
Adjustable Pitch Propeller Taper-Lock Hub
Reversible Propeller With Thru-Bolt Construction
©2005 Aerovent
Cap and U-Bolt Side Lock Nut Side
Fig. 1
Angle setting index on shank socket. Marked from 10° through 50°. Each
mark is 2°. When hub is viewed as shown above, scale on left side
should be used for right-hand propeller and scale on right side should
be used for left-handed propellers.
Fig. 2
Elastic Stop Nuts
Index Marks
Blade
U-Bolts
Cap
Blade
Shank
Hub
Key
Keyway
Fig. 3
Fig. 4
Angle
Setting
Mark
Index
Mark
Inlet Side Discharge Side
General Installation, Operation and Maintenance Instructions For Aerovent Products
PROPELLER HUB U-BOLT TORQUE
DIA. DIA. SIZE (FT/LBS)
54" – 72" 14" 1/2" 20
81" – 96" 18" 3/4" 45
IM-173
June 1997
®