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James,
I don’t know if you are using Tracy’s EC-2 or 3,
but it has a rev limiter somewhere around 7500 rpm. I don’t know
what would happen if you invoke this limiter but it might be scary.
:>) I try to limit my Renesis to about 7200 rpm in order to stay away from
the limiter.
Do you have any pictures of the P Port for
the Renesis? Did you substitute any parts to do this?
Bill
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Wednesday, July 23, 2014
7:45 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Rv7
renises p port
I don't know jack about slippage, but I think it is the percentage
difference between actual distance traveled and theoretical distance traveled
if your propeller corkscrewed through the air with no thrust. B I found a prop
slip calculator online and for 86 inch pitch, 2.85 gear ratio, 7000 rpm, 180
mph, I get 10% slip. B Granted the calculator was for boat propellers, but I
don't think it matters as long as the units are correct. B There has to be some
slip because there would be no thrust otherwise. B So what is considered a
reasonable or good amount of slip? B Using Bill's numbers 86 inch pitch, 2.85
gear ratio, 7000 rpm, 200 mph, I get 0% slip. B That can't be right!
On Fri, Jul 4, 2014 at 7:19 AM, Bill Bradburry <flyrotary@lancaironline.net>
wrote:
Christian,
It seems that you have a lot of prop slippage at cruise. B I think that at
that prop rpm you should be getting 200mph if you had no slippage.
Bill
-----Original Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Thursday, July 03, 2014 4:01 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Rv7 renises p port
Well hi all
Just thought I'd throw out there the mods I,ve done to the renises in an
rv7'.
Well the p ported engine is now back in the plane and running well, over the
standard short manifold that was originally in the plane I have gained
around 400 static rpm, same prop and gearbox combo, 2.85 ratio, this equates
to allot more hp at takeoff, just shy of 2300 prop rpm, I'm running a prince
p tip prop at 68" x 86" pitch,
At 8000 ft it is turning 7000 at 180 mph tas which is an improvement of 25
mph on previous tests, . So next plan is bigger prop and less pitch to let
it rev to 7500 in strait and level.
Cheers
Christian
Rv7 renises Aus
Sent from my iPad
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