Many thanks for the unexpected Fax Barry.
I'm perusing it tonight.
I'm not sure whether the RPM values (presumbably prop RPM) are easy to convert
to equivalent engine values in the Europa install.
Also, I've no doubt that it helps to speak German.
I could scan it in and put it through the babelfish language translator, but
that
tends
to result in a draft for a comedy script !!
Cheers,
alan.
Tennant wrote:
> Hi Alan
> You have posed a very complex question.
> I have faxed you a copy of the Power settings for the Katana which shows some
> interesting traits of the Rotax.
>
> One of the most interesting things is that the relationship between power %
> and
> fuel flow. For example 75% at 4000 ft will use only 16,3 L/hr but at 6000 ft
it
> will use 19,3 L/hr.
>
> I think that the guys with the VP props will all confirm that the RPM does not
> seem to effect fuel cosumption or speed nearly as much as the throttle
> setting.
>
> Also, dont worry too much about reving the rotax, it prefers it and in the
> Katana is recomended to run at max continuous rpm always!
>
> Best regards
>
> Barry
>
> alan.d.stewart@bt.com schrieb:
> >
> > Does anyone know the value of engine RPM which would correspond to 75 %
> > power in the standard 912 UL fitted to the Europa ?
> >
> > At the current prop. setting my engine RPM reads just over 5000 static, 4820
> > in the climb, and circa 5700 firewalled, S & L. (Figures accurately measured
> > on Rotax Flydat). I do not have the cool air, plenum box mod.
> >
> > The reason for my question....
> >
> > http://www.zenithair.com/kit-data/zac-rtx912.html
> >
> > 'Fuel burn @ 75%: 4.5 US gph'
> >
> > This corresponds to 3.75 Imp gal/hr or 17 litre/hr.
> >
> > My long term actuals, range from 15 - 17.8 litre/hr at cruise RPM of around
> > 4800 - 5200, and I was wondering how closely this correlated with Rotax'
> > published figures.
> >
> > It would make sense if 5100 RPM corresponded to approximately 75% power, as
> > this would tie in with the published figures.
> >
> > I could look at some of the data in the engine manual for this, but was
> > wondering what results other people have been getting ?
> >
> > Many of you appear to have quoted figures of around 11 - 12 litre hour which
> > I could not achieve without throttling back to much lower RPM's.
> >
> > I'm fortunate to have a large (early design) 84 litre tank in my a/c. This
> > gives a safe maximum of around 70 litres useable in main or about 4 1/4
> > hours endurance at standard cruise (approximately 450 nautical miles).
> >
> > Alan Stewart
> > ab ASE - Advanced Systems Engineering
> > BT Adastral Park. Tel:- +44 (0) 1473 607571 / Fax:- 606845
> > mailto:alan.d.stewart@bt.com
> >
>
--
Alan. D. Stewart
14 Goddard Way 'phone : +44 1245 264186
Chelmer Village work : +44 1473 607571
Chelmsford, Essex CM2 6UR email : alan.stewart@cableinet.co.uk
office email : alan.d.stewart@bt.com
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