-----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