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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
> > > > > >
> __________________________________ > Do you Yahoo!? > Yahoo! Mail - Helps protect you from nasty viruses. > http://promotions.yahoo.com/new_mail
> > >> 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/
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