Originally Posted by
RichardGee
Saito does provide fuel consumption for some of their gas four stroke singles, just not their multi-cylinder engines. Example: The FG-40 consumes 30cc/minute @ 7500 rpm
Well, your calculation is about what I assumed from Jaketab's post and the 'mileage' he was getting from the tank in his Zero.
I do find 1.5 ounces a minute at WOT to probably be about right.
I am not a big fan of running radials WOT for any length of time on the test bench, which is why I didn't (or haven't) measured consumption myself.
The issue of fuel consumption is important based on a number of limiting factors with my current tank install.
I get what you're saying, but I cannot say anything about Saito's decision not to provide that consumption info.
No fan of running radials at WOT on the ground either, but if this helps:
If you can do a decent peak RPM measurement, take a good propcalculator and check what output that translates to. Use output in kW (HP x 0,735)
Your engine will by and large (generally accepted rule of thumb for a naturally aspirated gasoline engine) consume 300 grammes of fuel (not counting the oil) per kW per hour.
That converts to 14,1 oz per hp per hour.
I just checked Saito's specs on that engine and Saito claims the engine can produce 6 hp, so that would suggest it is capable of consuming about 84~85 oz of gas per hour, excluding the oil. At 20:1 that would mean we need to add some 4,25 oz to that, and then we are pretty close to the 90 oz I estimated earlier. I only have to retract the "give or take"... Consumption could be less (depending on propsize and throttle regime), but most likely not more than 90 oz per hour.