Barry,

 Before we go too much further, we need a PSRU  that can handle 500+hp.
 We've already had flywheels [flex  plate] disintegrate and my
 input shaft broke the
 lock pin.  I would  consider installing a turbo, but in my opinion, the
 psru is the weakest  link.

 Mark
 P-port 20b

 My last trip to Tracy's we discussed  this. His recommendation  is to use
 an aftermarket aluminum flywheel  and attach the PSRU input to that. His
 latest iteration of the PSRU will  attach to this flywheel easily he says.

 As far as the lock pin, that  would take more thought. Drilling it out
 and installing a larger diameter  pin will increase the shear of the pin
 itself but at a cost to the strength  of the shaft itself.

 Kevin Alderman

 Just install two lock pins  90 degrees to each other.

 We did that on Dave's turbo Reno  racer.

 When I get home I will send a dwg. We have been around and  around on
 this. I am surprised Tracy did not mention it or start doing  it.

 Paul Lamar


 Other than the weight, I take it  there was no problem with the flywheel
 Dave installed?
 Re:  the pins: is it possible that the pins were transfering the power and
 the  pin bores were tight and the spline clearance was allowing the power
 to
 try  to flex the pins?

 Dale Davies

 Dave has reported no  problem so far with the steel flywheel.

 BTW If you can't handle putting  two pins in the sun gear send it to me and
 I
 will do
 it. I have done  a couple already,

 Paul Lamar

 Is Dave Leondard racing at Reno  again this year?
 Chris Cosman

 I don't think so.

 Paul  Lamar


 To All,
 While we are addressing PRSU issue's, here is  another one. I'm
 mounting my prop extension and prop; In doing so I have  found
 that my prop tips move about 1". Is this too much back-lash?  Seems
 like I remember hearing that it should be around 1/4". Any  suggestions
 would be appreciated . Thanks!
 Frank Clementi

 Mine  moves about an inch as well. Next time I go to the hangar I will
 measure  it.

 Paul Lamar

 Paul,

 Tracy recently told me the backlash  should be between 3/8 and 5/8".

 Mark

 I'll go out today and see  what mine is.
 Frank, What gear box do you have? 2.17 or 2.85?

 Paul  Lamar


 doesn't the amount it moves depend on the length of the blade?

 What length blades are y'all using?

 Rich

 Yes but it is a minor factor. Most props are 68 to 72 inches in diameter.

 Paul Lamar


FYI - I'm running a 76" 3-blade prop.

Mark

Yes but you have a variable pitch prop and a 350 HP p-port 3 rotor :)
How much back lash?

Paul Lamar
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