-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, just wondering if you know fuel burn at full throttle.  If the engine
is tuned well (good Ve), it can burn double the fuel rate you mentioned at
5000 - 5300 at full throttle.  I'm assuming that you are well below WOT at
5300?

Tracy Crook

No I don't, I guess that's where a fuel flow monitor be a nice thing to
have.  No, not well below WOT at 5300.
WOT was 5500 before the recent mods, down to about 5400 now.  The mods
are going well to shorten the runners, so we'll see if I can get some of
that back. I mainly want the power back for climb.  Climb RPM at 90
knots decreased from 5200 to 5100 and it is noticable.

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

Tracy I might add that Perry is using the stock computer and mass airflow
sensor so he has no direct control over the mixture in case you were thinking
of an conventional aircraft system. Is that still correct Perry?

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.