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
Paul,
Stand by...I'll be checking it on Friday when I'll be at the airport next.
What are your thoughts on the 8 bolts that hold the ring gear to the
housing? They appear to be 1/4 - 28 bolts.
Mark
Do they hold the bulkhead that holds the ring gear to the housing ? :)
There are two schools of thought on that. One says you need a bit of slop
in the ring
gear and the other says mount it solid.
I don't know if Tracy tried mounting it solid but that would be what I
would try
first. The sun gear and planet gears are inherently self aligning. It
might take a
sleeve to mount the ring gear solid.
The bolts are not a problem. A 1/4 inch bolt will take a lot of shearing.
The bulkhead made from powered metal is a bit scary however :)
I would also do away with the spline and bolt the planet carrier to the
prop shaft.
Paul Lamar
Paul,
I measured the endplay on my psru today... 3/4" at prop tips. I'll discuss
with Tracy to see if he recommends any new parts.
I also fabbed up some new steel lines for the OMP. The old ones were
leaking slightly around the crimp clamps. I feel much better about using
the OMP now.
Mark
OMP Oil Metering Pump.
BTW Barry, you should drive over and see Mark. He is in Austin.
It is only 500 miles. Out here on the left coast that is a piece of cake:)
I'll be driving to Fl in a couple of weeks so I hope to stop in and see
you guys.
Paul Lamar
That's one hundred miles less than driving from Austin to El Paso. Pretty
barren landscape out there in W. Texas. Speed limits are 80 mph, so it
goes by fast. More fun to fly though.
Mark
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