I hesitate to comment in the face of expert opinion, but...
Irrespective of whether you have a CS prop or not, waggling the
throttle does influence how much power the engine generates so
Richard's statement appears reasonable. i.e. the throttle always acts
as a power lever.
The fact that the RPM doesn't change (much) for different power levels
when using a CS prop is not really relevant.
Cheers,
Mark
---------
From: "R.C.Harrison" <ptag.dev@ukonline.co.uk>
Subject: was RE: Europa-List: G-OWWW first flight .now a debate about
Throttle/power
levers.
Date: Thu, 27 Feb 2003 13:40:13 -0000
>
> Hi! Richard.
> I'm sorry but I disagree with your statement below that "the throttle is
> always a power lever."
> It is always the lever which regulates the intake of fuel and normally
> associated with RPM. However if a Constant Speed Prop is restraining the RPM
> to a fixed level then although the lever performs the same fuel control
> function it is actually now controlling the POWER output of the engine
> against the fixed RPM.
> So Rotax or not you can be inflicting a call for an impossible(and therefore
> damaging) power demand against the fixed constant RPM course pitched
> propeller unless you have known manifold pressure parameters within which to
> stay.
> I will be very interested how you present your case and the outcome of the
> argument you are destined to have.
> Regards
> Bob Harrison G-PTAG
>
> -----Original Message-----
> From: owner-europa-list-server@matronics.com
> [mailto:owner-europa-list-server@matronics.com]On Behalf Of Richard
> Holder
> To: europa-list@matronics.com
> Subject: Europa-List: G-OWWW first flight.
>
>
> > 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.
>
> Actually the throttle is ALWAYS a power lever, CS or no. What you mean, I
> think, is that with CS the tacho is NOT a measure of power.
>
>
>
>
>
|