Al,

I would love to see 9.5 gph in cruise.  The very best I've been able to get was about 12 gph.  No, haven't followed the procedure spelled out in the EM-2 manual.  But the "fuel remaining" after adding fuel is pretty close to what the fuel gauges show.  I know this isn't very accurate, but it will have to do until I do the formal calibration. 

 

Tracy gave me a rule-of-thumb for fuel burn.  He said the rotary will burn about 10 gph per 100 hp (.60 bsfc).  Based on that rule-of-thumb, I would expect to see about 26-30 gph during full throttle, high rpm operations.  I know this is a very simplistic analysis, but it seems to be in line with other engines in this hp range.

 

Mark

 

 

 

On 2/6/08, Al Gietzen <ALVentures@cox.net> wrote:

 

Yes, the 20B can be a thirsty beast.  My EM-2 registers 26gph on initial climb.  It will drop down to 12.5 - 16 gph in cruise, depending on MAP, prop speed and mixture.

Mark

 

Mark;

 

Have you done EM2 calibration checks against measured fuel use?  I ask because I see about 20 gph on climb out and cruise at about 9.5 gph at 5300-5400 rpm.  Last check showed the measured fuel and EM2 agreeing pretty closely.

 

Al