Sender: <marv@lancaironline.net> (Marvin Kaye)
To: flyrotary
Date: Tue, 03 Jun 2003 08:52:49 -0400
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Reply-To: <alventures@email.msn.com>
From: "Al Gietzen" <alventures@email.msn.com>
Subject: RE: [FlyRotary] Re: EGT's; Fuel consumption
Organization: ALVentures
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> or more minutes.  The number of these runs was limited to 4 as these
were
> the last tests we were doing and ran out of time.  The results are as
> follows:
>
> RPM Mixture MAP ("Hg)  Avg EGT (F) HP BSFC mpg
> 5,100 WOT Max pow 26.6 1,570 220 0.52 12.5
> 5,100 Leaned 23.8 1,556 155 0.49 16.9
> 5,000 Max pow 24.8 1,544 200 0.54 12.9
> 4,550 Max pow 21.8 1,488 150 0.55 15.6
>
> The target operating points were 1.) 5000 rpm WOT, 2.) 5000 rpm, 24"
MAP
> about 150 lean of peak, 3.) 5000 rpm, 200 hp, and 4.) 4500 rpm, 22"
MAP.
>

Hi Al,

    Here is what my spreadsheet calcuations for a 3 rotor at your rpm
and
HP.
RPM,     HP,     GPH,     A/F

5100        220    19.7    13.50  WOT
5100        155    13.93    19.10 Leaned
5000        200    17.98    14.50 Max Power
4550        150    19.90    17.00 Max Power

The A/F may be off for anything but your WOT run as my program does not
factor in throttle setting, just airflow and airfuel mixture, altitude
and
temperature.  (I used 0 ft altitude and 59F).  So You could have a
higher
A/F but low throttle setting and get less HP than the A/F and RPM would
indicate.

Ed Anderson

Ed;

You're right, the A/F are off except for the WOT run.  The GPH don't
correspond on the runs 2 and 4 either, and I'm wondering - why?  The
measured GPH values 12.55 for the leaned run, and 13.37 for the 4550 run
(hp was closer to 145, I round off). What is your spreadsheet
calculating?  GPH is just BSFC x hp / 6.

Al


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