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The fuel consumption data was very limited because of a high degree of
scatter caused by poor flow meter performance. The computer logged data
for
this parameter was essentially unusable. Some good data was measured by
doing timed runs, i.e.; set up a steady state engine operation and take
weight readings of a fuel supply container at one minute intervals for
five
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
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