Q concerning horsepower

I was wondering a cessna 152 takest abaut 20 liter per houer full
power for 100 horsepower with a very big engine size
now if you take a honda pan european st 1100 this engine is little
and takes about 10 liters for full power and 100 hosepower
are those horsepowers the same? if yes why do airplane engines take
so mtch fuel for the same ? power
willy

Euro-Motors wrote:
> I was wondering a cessna 152 takest abaut 20 liter per houer full
> power for 100 horsepower with a very big engine size
> now if you take a honda pan european st 1100 this engine is little
> and takes about 10 liters for full power and 100 hosepower
> are those horsepowers the same? if yes why do airplane engines take
> so mtch fuel for the same ? power
> willy

You will have to prove to me that a
motorcycle engine can produce 100 hp
continuous and burn 10 liters per hour.

More likely the engine is getting an
average of 10 liters per hour and it's
producing an average of 20-30 hp while
cruising.

As I recall a well tuned and leaned aircraft engine will produce about
15HP per US Gallon per hour.
This works out to about 4 HP for liter (3.9 but rounded for
simplicity)

So 20 Liters per hour should only be producing about 80 HP. Most 152
engines are not run this lean nor are they will tuned anywhere near
enough to do so. So this is really a best case Scenario.

If this applys to the motorcycle engine which is probably tuned much
better than the 152 engine then it is only producing about 40Hp ant 10
liters per Hour.

Brian
CFIIG/ASEL