The attached picture is from my single rotor PP engine after about 10
hrs running time. Most of the time was running at WOT and 6000RPM. fuel
flow was around 8gph.
If this an indicator of mixture distribution at ignition, what does it
mean? if anything. Has that been observed by anyone else?

Richard Sohn
N2071U

You got me. I have never seen anything like that.
What kind of oil are you mixing?

Paul Lamar




Richard,

I can't offer insight on the fuel burn pattern. I am very interested in
the single rotor development and I thank you for pioneering it. Do you
have any idea what the fuel burn and RPM would be for about a 45-55hp
cruise? I would like 100hp for take off and climb out 10 minutes and
then pull back to 45-55% would a rotary work well with this profile or
must if be run fast?

Matt

Matt, fully leaned rotaries will burn .47 pound of fuel for each HP
generated for one hour.

Running full rich at full power they will burn .6 pounds of fuel for each
HP for each hour.

Fuel weighs 6.25 pounds per gallon.

Example: full power, 100 HP, 60 pounds of fuel per hour. 60/6.25 is 9.6 gallons per hour.

Cruise power, 50 HP, 23.5 pounds of fuel per hour is 3.76 gallons per hour.

These number .47 and .6 are called the BSFC of an engine. That stands
for Brake Specific Fuel Consumption.

Some car engines are as low as .4 and most new AC engines are .45.
My C182 O-470 is .52.

Paul Lamar