Although our Europa XS with 912S has a Whirlwind CS prop, I almost never use the
manifold pressure gauge, instead using the fuel flow for setting cruise levels,
etc.
Terry Seaver
N135TD
John & Paddy Wigney wrote:
>
> R.C.Harrison wrote:
>
> >On the Manifold Pressure question, without one you will never know whether
> >you are running the engine constantly overloaded or not, with the CS
> >prop.your throttle becomes a power lever since the RPM control is done by
> >the prop.
> >
> For Rotax 912 owners, the question of overloading is addressed in the
> Operators Manual, ref. section 10.1.1.2 :-
>
> " The engine allows operation with fully open throttle valve over the
> whole r.p.m. range, without limitation. But full throttle operation
> performance above 5500 r.p.m. is limited to 5 minutes."
>
> From this, it is could be argued that it is not necessary to have a
> manifold pressure gauge with a 912 and a variable pitch or constant
> speed prop, since it cannot be overloaded below 5500 rpm. Having said
> that, the manifold pressure gauge is pretty well indispensable to obtain
> desired and repeatable engine power settings. I would not be without
> one, I refer to it all the time.
>
> Cheers, John
>
> N262WF, mono XS, 912S, WhirlWind c/s prop
> Mooresville, North Carolina
>
|