On 12/15/04 12:37 PM, "Mark R Steitle" <mark.steitle@austin.utexas.edu> wrote:

I have been working to resolve a problem for more than a month now and thought I would query the group for a possible solution. 
 
If anyone else is running (or planning to run) a 3-blade M/T electric prop with the RD-2C gearbox, I have discovered a mating problem in using this prop/gearbox combination for my 20B.  The problem is the RD-2C prop flange comes with 3/8 id x 5/8 od bushings.  The M/T prop has a stepped hole that is ¾” for the first 3/32” and then goes to 5/8”.  Tracy is not comfortable with drilling out the 5/8” bushings and M/T adamantly advises against using anything less than ½” prop bolts with this prop.  So, I’m at a standstill until I can get this resolved.  The only solution I can see is to press out the existing bushings and open up the holes to accept ¾” od x ½” id bushings.  But that would require disassembly of the gearbox and some precision machine work, possible but not my first choice. 
 
Mark S.
Lancair ES – 20B
(with a very pricey lawn ornament)     

Hi Marc, I ground (with Tracy’s blessing) a recess in the aluminum housing behind one bushing just enough that the bushing can back out. This way I can rotate the flange and pop the bushings one at the time. Works great. You’ll need a air grinder and sharp grinding bit. All the work is done through one of the holes in the flange. Good Luck.
Buly