BTW the Lemans engine power curve below 5000 RPM is determined with
the intake tubes fixed in the 175 position so that divided by two is
what we will get in the idle to 5000 RPM range. It would be nice if
this were plotted on your charts along with the prop curves so we
could determine what happens around static RPM.

Hi Paul,

If I understand, this is the same chart plotted to a lower RPM.  If so,
here it is.  I haven't seen any data below 4000 RPM.  I'm also attaching
a .png versoion of the plot. Is this format compatible with your
newsletter? As you can see, the file size is much smaller.  If everyone
can open a .png, it would save a lot of bandwidth for the dial-up users.

Bob White

--
http://www.bob-white.com
N93BD - Rotary Powered BD-4 (soon)

You have been a great help on this Bob. Thanks.
I want people to understand the interaction between prop load
and intake manifold tuning and these curves go a long way in
that direction. Thanks again.

Paul Lamar

Paul

Let me get this straight.  Your data shows, the effect of RPM (at least for
the P port versions) on the  Hp curves and the estimated prop pitch angles
to allow the engine to achieve those rpms.  So with a constant speed prop to
reach highest rpm according to your data we would be setting the pitch angle
at 6.  Step to the blue line please.  I understand this chart is more for
demonstration the effect. All props would have a different power curve and
perhaps not so linear.

Muy bueno

Doug in Japan.

These are my wild at guess of the HP consumed by a prop as a function of
the RPM looks like. They arer in no way quantitative at this point. It could 
be some other math function and may in fact not be so simple.
Due to the fact that tips of the prop approach supersonic velocity and
a consequently steep drag rise the shapes of these curves could be far different.
I am hoping Vance can come up with some prop HP consumption figures based on
his computer simulations.

Paul Lamar
 
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