In article ,
"karel" wrote:

Out of curiosity I started to look for fuel consumption figures for the
Jabiru 3300.
I found a figure of 0.46 lbs/HP/hr which is not particularly meaningful to
me.
Moreover it said "at cruise power" without further specification.
So I started to assume 65% powser for cruise, calculating from
the rated power of 120HP this gives some 78 HP.
So 78*0.46 gives me 3.6 lbs/hour, or 6 USG per hour or close to 23
liters/hour.

Is this way of calculating correct and do the numbers seem reasonable?
I had expected this engine to be less fuel hungry than the Lycomings &C...
Do not Rotax claim something like 15 liters/hour?

Your method is correct -- but it is 36#/hr, not 3.6! Yes, it does work
out to about 6 gph. BTW, 0.46 #/hp/hr is right in the ballpark for
aircooled piston, gasoline engines.

PS do not tell me that the rated power of 120 HP is not for
continued application, I knew that. Seems similar to the Rotax 914S.