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Rich,
A load cell was installed on one side of the engine mount to measure torque. HP was calculated from the torque and the RPM. Most installations with a Renesis engine appear to be using a higher gear ratio than the 2.18:1 ratio of the reduction drives that
I have. This lowers the limit the of engine RPM that I am able to achieve with a prop suitable for flight.
The HP required to turn the prop at a given static RPM does not change if the atmospheric conditions haven't changed. At the highest MAP of 21.5" shown on the chart for the NA 13B, the 13B HP is very close to the HP of the Renesis at that same MAP. The
test data on the chart was generated as a first pass at assessing the suitability of turbocharging the Renesis compared to the 13B engine. None of the configurations should be considered to be optimized.
Steve Boese
RV6A, 1986 13B NA, RD1A, EC2
From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of argoldman@aol.com [argoldman@aol.com]
Sent: Thursday, January 03, 2013 2:43 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: turbo manifold
I had assumed that these were dynamometer results. By what method did you ascertain the HP listed?
Interesting results. If the blades stalled (overpowered) at such a low RPM would it be
correct to assume that at that RPM the engine was producing more power than the non Renesis engines at the same RPM with the same prop???
I am so confused... interested also in perhaps turboing the renesis in the future??
Please help
Rich
-----Original Message-----
From: Steven W. Boese <SBoese@uwyo.edu>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, Jan 3, 2013 2:55 pm
Subject: [FlyRotary] Re: turbo manifold
Bobby,
I honestly don't know what the exhaust sound was like. The control panel for the test stand is on the opposite side from the exhaust outlet. Also, at RPM above 5200, the 3 blade Warp Drive prop was stalled and the prop noise was just deafening. I could
feel what seemed to be ground vibrations in my feet so testing higher power levels was disconcerting. At RPM below 5200, the noise was similar to having the GM diesel truck muffler on the NA 13B .
Steve
From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of Bobby J. Hughes [bhughes@qnsi.net]
Sent: Thursday, January 03, 2013 1:33 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: turbo manifold
Steve,
How did it sound without a muffler? I removed my belly muffler for a speed run and it was not tolerable in the cockpit. Only picked up 1-2 mph so the muffler
is back on.
Bobby
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