ARPLAST PV-50, Manual

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Page 4 of 8 © Lyndhurst Touchdown Services Limited updated February 2007
Counter Balance Weights De-Grease weights and blade use a little locktite between them
These can now be turned into their final position. Align the slit in the counterweights with one of the two
scratches on the blade root (counterweights can face towards back or front of aircraft). Pulling the blades
away from the hub ensure there is a small gap between the weights and face of the hub.
Counter Weights
Tractor and Pusher Installations
Tractor Installation
(Pusher dotted)
Thoroughly clean the counterweights and blades with alcohol or similar de-
greasant, apply a little locktite. Under or over-tightening could allow the
counterweight to turn which could be dangerous. Remove and replace the
additional washers to the counterweight using locktite. For anodised counter
weight supplied after 2003 install the small security pin seen in photo.
Slide the aluminium tube off the front of the propeller. Check all wires are free
and not under strain. Grease the lead screw with the swash plate tube in its
rear position. Replace the tube cover.
The propeller is mechanically ready to mount at this stage.
Propeller mounting
Hubs are supplied with three threaded holes in the back of
the hub which take three short screws which are put into
the propeller from behind the propeller (in tractor
configuration). In Rotax 912, 912S & 914 installations it will
be necessary to replace three of the existing threaded
collar nuts with three special ones provided. If you intend to
wire lock the propeller fixing blots (recommended ) drill the
heads at this stage.
NB If any of the threads in the aluminium hub become worn
then inserts must be used to replace the worn threads.
Check all modifications with your aircraft inspector.
Remove three Rotax collar nuts and replace with Arplast Inserts. Offer the propeller up and insert long M8
bolts into the hub and screw into the collar nuts do not tighten completely at this stage. Insert three short
nuts through the back of the propeller flange. Progressively tighten the bolts (torque 1.5 m.kg / 11 lbs.ft).
Wire-lock!
Balancing – The propellers are balanced assembled in the factory. In many cases this will adequate
however accumulation of errors or a poorly balanced spinner may mean that the balance is not
satisfactory. The propeller may be balanced on the aircraft dynamically using electronic equipment.
Alternatively the propeller can be balanced by trial and error for
example by attaching washers to spinner fixing bolts and determining
the optimum position. Then adjusting the correction weight to arrive
at the optimum solution.
Some propellers were supplied with balance corrections in the form
of extra washers under some bolts. Keep your balance plan if
provided! Balance correction view from Flange side.
Some hubs have washers fitted to provide a weight correction.
Please observe the correct configuration.
90º
Blade at 40% Ø
Slide back counter
weight. Apply a little
locktite to blade collar
Weight
Hub
small gap