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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-565026@logan.com>
Subject: Re: [FlyRotary] Re: Glide
Date: Mon, 13 Dec 2004 07:31:54 -0500
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My experience with the 2.17 and 68x72 prop is that it would continue to
windmill down to 105 MPH IAS, it would stopped below that, but diving
slightly to 115 MPH would get it rotating again.  No experience with the
2.85 but I suspect with the much longer 76 inch prop it will also windmill
perhaps at a bit higher airspeed.  However, not intention of seeing if that
is true (intentionally that is)..

Ed Anderson
----- Original Message -----
From: "DaveLeonard" <daveleonard@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, December 13, 2004 1:18 AM
Subject: [FlyRotary] Re: Glide


> Well, I can tell you that with my engine turning off all fuel and power to
> the ignition the prop still keeps wind milling down to 100kts.  Maybe I'll
> try going slower one of these days just to see.
>
> David Leonard
> The Rotary Roster
> http://members.aol.com\_ht_a\rotaryroster\index.html
>
>
>
> >
> > Ken,
> >
> > The one experience I've had with a "stopped" engine was in a C150.  I
> > asked an instructor how much different it was if the engine was really
> > stopped  as compared to idleing.  We were at about 9000 ft (4000 AGL) so
> > he killed the engine.  I was surprised that the prop did not windmill.
> > It stopped!  After gliding around for a bit, we put it into a dive, and
> > the prop didn't budge till we were over 120 IAS.  With a gear reduction,
> > it would be that much harder for the prop to turn the engine, so you
> > probably won't get a windmillng prop, which would be worse.
> >
> > Bob White
> >
> >
> > On Mon, 13 Dec 2004 04:16:32 +0000
> > kenpowell@comcast.net wrote:
> >
> > > Yes, I have been told of the differences in a 'real' engine out as
> > > opposed to just pulling the engine to idle.  However, in the junky
> > > rentals that I fly I wouldn't dream of actually killing the engine and
> > > flying it to the ground.  That would be the one time that I came up
> > > 'short' and the engine wouldn't crank especially since the glide
> > > really is shorter with the engine off and NO thrust (I also understand
> > > that a windmilling prop causes more drag than a 'stopped' prop).  So I
> > > guess that I'll just have to continue my practise with the engine at
> > > 'idle'.
> > >
> > > Ken P.
> > >
> > >
> >
> > --
> > http://www.bob-white.com
> > N93BD - Rotary Powered BD-4 (soon)
> >
> > >>  Homepage:  http://www.flyrotary.com/
> > >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>
>
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>