Hi all,
My understanding is that at the moment relatively few 912iS are flying, and most have fixed pitch propeller.
So few pilots are aware of the absence of a power setting table in the operators manual.
For instance, with a 912, the OM gives such a table :
With our 914, we usually cruise at 75% power, according to the table in our OM :
Whenever the pilot wants to set 75%, he adjusts the pitch lever to 5000 rpm, and the throttle to 31 inHg.
The engine performance is repeatable, so performance measurements are possible.
The injection doesn't change the means of setting a definite power.
Otherwise it is not possible to know the power the engine is delivering, since for a given power, you get more than one fuel flow value.
Without an MP gauge and a definite setting, it is impossible to estimate a fuel economy : you have the fuel flow, but you don't know the corresponding power setting.
Obviously Rotax did their homework, since Mr Stock uses the values in his engine management system, but at the moment they have not been released to the public.
But to fly with a CS prop, we definitely need the data.
Maybe in the near future ?
Best regards,
Gilles
