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Message-ID: <20041220051453.84118.qmail@web41524.mail.yahoo.com>
Date: Sun, 19 Dec 2004 21:14:53 -0800 (PST)
From: Tom <tomtugan@yahoo.com>
Subject: Re: [FlyRotary] Re: George Graham glide update
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-573626@logan.com>
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I'm glad I only went as far as saying they might differ.   Gyrocopters have
free-wheeling blades, they would probably descend a 'bit' quicker if the blades
stopped rotating.    

There really are posts here which have more useful info.  I've spent a few
hours today and a couple yesterday going thru them and capturing and organizing
info.   Break-in oils, oil-thermostats, fuel-injector stuff, soft-mounting
stock Mazda oil coolers, MMO, A/F indicators, intake manifold lengths and
configurations, ignition coil wire types, ... I'm actually feeling good about
being able to have a good installation that'll work reliably despite my lack of
any background.    Something I'd like to find is 'how to remove powder coating
from a motor'.  Gold was a bad choice, I'd have less other parts to paint if
the motor were silver and blue.   I'll probably simply repaint over the gold.  
       

Tom


--- Bob White <bob@bob-white.com> wrote:

> I suspect they would be different.  To hazard a guess, a free spinning
> prop is doing less work than a prop turning a motor, so it should
> provide less drag. But a fixed pitch prop in either condition would want
> to turn somewhere in the range of speed you would be gliding at.  A prop
> at flat pitch would need to speed up to a very high rpm to match the
> forward speed of the plane.  If the prop can't keep up with the forward
> speed of the plane, it will effectively be pushing backward creating
> extra drag.  At least that's my armchair analysis.  
> 
> Bob White
> 
> On Sun, 19 Dec 2004 18:10:25 -0800 (PST)
> Tom <tomtugan@yahoo.com> wrote:
> 
> > I wonder if a free-spinning prop on a broken tranny would not have the
> > same drag as a spinning prop which is turning the motor?    I'd be
> > inclined to say they would differ. 
> > 
> > Tom
> > 
> > 
> > --- Bob White <bob@bob-white.com> wrote:
> > 
> > > Somenone else recently reported a spinning prop having negligable
> > > effect on engine out glide.  (Dave Leonard maybe?).  I'm thinking
> > > that the biggest effect occurs with a C/S prop that goes to flat
> > > pitch when it looses oil pressure.  I think twins often use
> > > feathering props for that reason.
> > > 
> > > Bob White
> > > 
> > > On Sun, 19 Dec 2004 15:41:53 -0500
> > > "Tracy Crook" <lors01@msn.com> wrote:
> > > 
> > >  He glided about 20 miles from an altitude of only 5000 ft with the
> > >  prop
> > > freewheeling!   I've heard several times that a freewheeling prop
> > > (no engine drag on it) would generate lots of drag.  Another sacred
> > > cow shot down : )
> > > > 
> > > > Tracy 
> > > 
> > > -- 
> > > http://www.bob-white.com
> > > N93BD - Rotary Powered BD-4 (soon)
> > > 
> > > >>  Homepage:  http://www.flyrotary.com/
> > > >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
> > > 
> > 
> > 
> > 
> > 		
> > __________________________________ 
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> > 
> > >>  Homepage:  http://www.flyrotary.com/
> > >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
> > 
> > 
> 
> 
> -- 
> http://www.bob-white.com
> N93BD - Rotary Powered BD-4 (soon)
> 
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
> 


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