In reply to:

4) A general rule of thumb for fuel consumption in an internal combustion engine lightweight enough to be used in an aircraft is one-half pound of fuel per horsepower hour. Figure 75% of max power at the claimed cruise speed of 350 MPH, that would
be 720 HP, which would require 360 lbs of fuel per hour or 54 gallons of fuel per hour, which works out to something less than 6.5 miles per gallon, about 40% of the mileage they are claiming. Their FAQ page strongly implies that the engines are
Wankel-type rotary engines. These engines have never been known for fuel economy.



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Frank van Gestel
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Frank van Gestel