I'm under the impression I have an answer.
Isn't there a law of motor performance that says that two motors putting out the same horsepower are consuming the same amount of air&fuel, assuming efficiency differences were not significant?
So if you had a 13b and a O-360 putting out the same horsepower for a single given 1 revolution of the propeller, they should be consuming the same amount of air and fuel during that 1 propeller revolution. (I THINK chosing 1 propeller rpm is a correct standard)
Bill pointed out that the 13b operates at a higher rpm, and we know that there's more combustion charges consumed by the 13b to make that 1 prop rpm.
The difference, the missing piece, each 13b combustion charge consumes a SMALLER amount of fuel/air than the piston powerplants less frequent combustion charge. ??? So the 13b burns a smaller amount more frequently. ???
If this is all true, then the Ellison isn't on the trash heap yet.
Tom
WRJJRS@aol.com wrote:
Group,
I want to remind everyone about how much a priority the large volume inlets are to us. I believe Ed Anderson was mentioning in one of his posts how difficult it can be to get a MAP signal in the airbox of one of our PP engines. This is a perfect indication of why the smaller throttle bodies used on some of the slow turning engines will kill our HP.
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