-----Original Message-----
From: Rotary motors in aircraft [
mailto:flyrotary@lancaironline.net]
On Behalf Of Tracy
Crook
Sent: Monday, March 22, 2004 8:03
AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: C mounting on a B plate??
Renesis & RD-1C drivetesting
The -C drive has very different internals but I will look at the
feasibility of reworking the -B housing to receive the -C guts. I
think it can be done. Yes, the -C bolts right up to the same
adapter plate. I think you are right about the 2.85 becoming the
preferred ratio, but only if you can handle the longer prop. You
nose draggers have the advantage here.
The more I fly it the better I like this setup. The
higher rpm was very disconcerting at first but I acclimated
rapidly. And now that I have digested the fact that the
actual rpm difference at normally used throttle settings is only about 5%, I
absolutely love it. Another good sign is that the manifold pressure is now
more than 5% lower at any given airspeed that I've tested so
far. Even if the wear rate is up 5% or so it would be a non
issue.
One more plus for the 2.85 is something I hesitate to mention.
It's kind of like the "engine making oil so I have to drain some out" thing,
kind of unbelievable. It makes sense that there would be less
prop noise but I'm also getting less engine
noise.
I was getting tired of the increased noise with the Hushpower II
muffler and was almost ready to put the Spintech back on even though it
costs at least 5 - 6 mph in drag. But with the -C drive things have
quieted down substantially. I think part of the credit for this goes
to the difference in RPM moving the vibrations away from the resonance point
of the sheet metal panels in my RV-4 but even observers on the ground have
mentioned that the engine sounds quieter.
I better shut-up now, this is starting to sound too good to be
true.
Tracy
----- Original Message -----
From: Ed
Anderson
Sent: Monday, March 22, 2004
8:30 AM
To: Rotary motors in
aircraft
Subject: [FlyRotary] C mounting on
a B plate?? Renesis & RD-1C drivetesting
Sounds great thus far, Tracy
Imagine having so much thrust that you can't
hold the aircraft still for maximum static, must be tough {:>).
If you initial observations hold regarding fuel consumption and
performance, then I predict the 285 will soon become the standard.
If the fuel burn/performance is a wash then only engine wear from higher
rpm might be a factor, but since the rotary seems to only have no/ minimum
wear in any case, that probably will not be a significant
factor.
So how much are you given for 2.17:1 trade ins?
Seriously, will the B model mounting plate accommodate the C model gear
box housing (looks like you mount it the same way). I presume it
would not be so simple as swapping out the internals as I am certain the
internal mounting/housing is different in the two. Third, in
case you consider getting rid of that old performance prop, put me on top
of your list.
Ed