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[TowerTalk] PP Can

To: <>
Subject: [TowerTalk] PP Can
From: (
Date: Wed, 3 Oct 2001 17:13:13 EDT
 In a message dated 10/2/01 9:14:09 PM Pacific Daylight Time, 
 writes: << 
  In a message dated 10/2/01 7:09:26 PM Pacific Daylight Time, writes:
  > Does anyone out there have a proven way to remove the threaded locking
  >  ring which secures the electric motor to the lower gear housing on a
  >  prop-pitch motor?  All of the previous P-P's I've had experience with
  >  had the retaining ring secured by peripheral bolts and was obviously
  >  very easy to remove.  This one has a threaded ring which has an ominous
  >  decal nearby on the housing which says "tighten to 250 to 300 foot
  >  lbs.!!  (They must have only had gorillas in the AAF to work on these
  >  things!).
  >  I've got a spanner wrench which I believe was recommended in a post a
  >  long time ago, but this doesn't even begin to turn the ring.  Using a
  >  drive punch with a hammer looks like it would destroy the key slots
  >  which obviously I don't want to do.  It seems like the only way to
  >  remove this ring is with the proper tool and a VERY large gorilla!
      Well - YEAH!
      The only method I've seen has been to use a small chisel or screwdriver 
  to tap the ring off. If you gouge the slots, just file them with a round 
      These transmissions and motors were used to change the pitch of the 
  propellors of WW2 airplane engines; the B-29 version plentiful and popular 
  there's a reason why their specs are BIG. I can't even imagine how much 
  torque they had to hold and change. 
      You know all those pictures of WW2 planes with their propellors 
  You know that can on the front of the propellor? That's the motor for the 
       If anyone's got one for sale, let me know - I'd be interested in it. 
  Steve      K7LXC
  Tower Tech  
 That's not quite correct. It's the can for the motor and gear box.  There 
 another full housing over the whole PP motor and gear box.  It matched a 
 ridge on the top mounting plate.  Without the full housing the water would 
 get into the gear box as some had holes in the side above the oil seal.  
 These need to be sealed without the full housing.  They also weren't 
 to work in the vertical position and that is why water can get down by the 
 oil seal unless proper precautions ar taken.  It's the greatest rotator ever 
 made when properly used.  Speeded up they work just fine also.  I have my 
 original also and it cost $15.  k7gco

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