-Dan Ruggirello wrote:

Perry,
I was looking through your website again and saw what your engine is

putting

out.  Why do you suppose the HP is so low?  Even without tuning,

shouldn't

it be greater than 146 HP @6500 RPM with all the emissions equipment
removed?

Dan

To save a bit of time Dan. Perry is using direct drive.

Paul Lamar

Dan, I don't really know exactly how much power the engine is putting
out, 120 HP is just an estimate based on fuel burn and analysis of my
prop, HP vs. RPM plots. If the engine is rated 146 HP at 6500 RPM, and
I'm operating at 5000, it is certainly less than 146 HP. I don't know
that removing the emissions stuff increases HP that much.

In the early days I cruised at 4800 RPM and fuel burn was only 6.5 gph.
 Lately I cruise more like 5000-5300 and fuel burn is up around 7.5 gph.

--
Perry Mick
Custom Composite Props
mick@bridgingworlds.com
http://www.ductedfan.com

-Dan Ruggirello wrote:

Yes, I understand it is direct drive.  But P=T*w........we have a known w,
but not torque.  Assuming Perry's HP assumptions correct, the reason I see
that he isn't getting a higher HP is because the engine may not be
developing it's peak torque at a given rpm .  Is it because of the low pitch
of the prop then?

Dan- 

Mostly diameter. Too big. Tip going transonic.

Paul Lamar
 
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