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Jarrett,
I'll take a stab at your
questions. First, the HP rating of the Renesis is in a bit of flux.
It was orginally listed as approx 250HP at somewhere around 9000 rpm.
However, once folks got their hands on some and put the on dynos, it became
apparently that the engine did not produce 250HP at least in its stock
state. The latest figure I recall was in the vicinity of 230 HP - still
not bad. However, if you do a search on the web on Renesis you may find
some more recent figures.
I don't think you will find any maximum continous
ratings for any of the rotaries. Clearly the higher RPM you run the engine
the more stress and wear. I personally have no quams about running
the older 13B at 6000 rpm the entire flight, although I normally fly it
between 5200-5800 due to the lower fuel burn.
The literature indicates that the Renesis gets
apporx 20% better fuel economy - thats the good news, the bad knews is I
understand that is only gain occurs only at the lower rpms and that at the
rpms we would normally run it at - the 20% gain decreases considerably.
No free lunch - you want power, you burn
fuel.
Tracy's 2.85:1 and EC2 EFI should work with no
problem. The weight of the engine might be a few pounds less than a 13B but
nothing significant. The rotors are a pound lighter each and so the
counterweights are probably lighter as well, so maybe a 5 -10lb reduction in
weight over the 13B block - nothing significant in weight savings like
aluminum side housing would provide. I think it uses direction ignition
(one coil per plug) so that might save a few pounds over the heavy 13B ignition
system.
My personal opinion is that you can probably gain
the same power out of a 13B if you have the rotors lightened, heavy duty
bearings/harden gears and the entire rotating assembly dynamically balanced so
you can wind to higher rpms. Would also need the right induction and
exhaust system. I mean the racing guys can get over 250 HP with the NA 13B
- however, their reliability might be less than you would entertain for an
aircraft application.
Lynn could probably address what you can get out af
a 13B better than anybody on the list
Lynn??
JJJ here are a couple of URLs on the Renesis that might help
Hope it helps
Ed
----- Original Message -----
Sent: Tuesday, November 18, 2003 12:19
PM
Subject: [FlyRotary] Re: Renisis
Question for the list. I've seen lots of
numbers thrown out there as to how much power this engine is 'supposed' to
produce. I'm wondering if anyone has some concrete numbers as to how much
'continuous' hp's one can expect at what rpm [what is the max continuous RPM
recommended?]and at what specific fuel burn? Also can this engine be turbo'd?
I understand from the Factory [in the Rx8] its NA. Tracy's 2.85:1 unit
should work on this engine?? As well as his electronic gizmo's? How far
is this engine as far as weights [installed] from the 13B? I've got lots
more but lets start there. [Or maybe someone has a web link they can pass on
that helps w/ these questions] I apologize if some are these [ I suspect they
probably are] redundant.
Thanks
Jarrett
Johnson
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