[TowerTalk] TowerTalk] Thrust Bearing for Use with Prop Pitch Rotor

[john at kk9a.com]

I believe that the prop pitch has a bearing and can hold considerable
weight. Having three bearings on a mast creates a line up issue but that is
a whole different subject. I just use a single thrust bearing at the top and
a prop pitch around 5' into the tower.

John KK9A


Mike k4gmh at arrl.net 

Hello,

What have others used to take the weight off of a tower mounted prop pitch
rotor?

Presently, in the final stage of modifying a rescued prop pitch and,
unfortunately,  it didn't have the triangle bearing plate.  Plan to use a
couple of Rohn TB3 thrust bearings, one at top of the tower and the other
approx. 2 ft below the top, but wanted to find out what others successfully
have used to keep the weight off prop pitch rotors.

The load will consist of a 2" dia. X 1/4" wall X 21 ft chrome molly mast
plus a homemade 40 m Moxon (approx. 70 lbs) and a 4 el SteppIR (approx. 50
lbs).

I've review the TT archive for thrust bearings for possible application
with a prop pitch rotor without any consensus on what to use other than the
available thrust bearings are not reliable in the long run.

  73,
  Mike, K4GMH