This raises an interesting question:
Is it possible to restart a VW engine by diving (I mean, make a steep dive
in order to increase airflow and possibly force the prop to windmill), or
is it a lost case?
I wonder, because my VW 2.4 liter does not have a starter motor, and that
would be the only way to restart... if it works.
My gut feel would be that it wouldn't work.
Serge Vidal
KR2 "Kilimanjaro Cloud"
Paris, France
"Golden, Kevin" <kevin.gol...@churchdwight.com>
Envoyé par : krnet-bounces+serge.vidal=sagem....@mylist.net
06/17/2005 17:15
Veuillez répondre à KRnet
Remis le : 06/17/2005 17:17
Pour : "'KRnet'" <kr...@mylist.net>
cc : (ccc : Serge VIDAL/DNSA/SAGEM)
Objet : RE: KR> glide rato..
A windmilling prop does more than disturb air over the airframe. A
windmilling prop will cause a huge amount of drag that is NEAR equal to
the
rotational disc of the prop.
Not to worry. I haven't seen a VW or corvair windmill. Lycoming and
Continentals will.
Kevin.
-----Original Message-----
From: Dennis Mingear [mailto:dennisming...@yahoo.com]
Sent: Friday, June 17, 2005 9:02 AM
To: KRnet
Subject: Re: KR> glide rato..
If the prop stops in a horizontal position it will
disturb the airflow over the wing, making it seem
smaller than it actually is, this will reduce the
planes L/D.
If the prop stops vertically the airflow over the wing
is not disturbed and you have more effective wing
area, producing more lift, which improves the planes
L/D.
If the prop is windmilling it is intermittantly
disturbing the airflow over the wing which is hurting
the wings ability to produce lift and hurting the
planes L/D.
Denny ...
--- "Kenneth B. Jones" <kenbjo...@cinci.rr.com> wrote:
> Perhaps the stopped prop is less drag because it's
> stalled.
>
> Below is data taken from my flight test. My idle
> setting was about 800 to
> 900 rpm, a little high, at the time. Speeds are
> indicated knots. My plane
> stalls at about 50 knots indicated so I didn't check
> the glide below 60 kts.
> Surely the ratio will start back the other way
> before it stalls. I have a
> KR-2 with Diehl wings, 3 blade Warp drive taper
> blade 58" prop set at 19.5
> degrees at the tip, A65, empty weight is 623 lbs.,
> full fuel is 14 gal and I
> weigh about 180.
>
> Glide
> Speed Descent Distance Glide
> kts ft/min NM/1000 ft. Ratio
> 60 400 2.50 15.18
> 65 442.5 2.45 12.93
> 70 525 2.22 11.73
> 75 625 2.00 10.56
> 80 750 1.78 9.39
> 85 800 1.77 9.35
> 90 900 1.67 8.80
> 95 1100 1.44 7.60
> 100 1500 1.11 5.87
>
>
> BTW, Bill's 2.5 miles per 1000 ft altitude is a
> glide ratio of 13.2 : 1 (if
> I calculated correctly).
>
> Ken Jones, kenbjo...@cinci.rr.com
> Sharonville, OH
> N5834, aka The Porkopolis Flying Pig
>
> ----- Original Message -----
> From: "Barry Kruyssen" <k...@bigpond.com>
> To: "KRnet" <kr...@mylist.net>
> Sent: Thursday, June 16, 2005 6:31 PM
> Subject: Re: KR> what a day./ glide rato..
>
>
> >
> > ----- Original Message ----- From: larry flesner
> I doubt if a stopped
> > propeller is going to triple that number
> >
> > A stopped prop actually produces less drag, don't
> know the reason but have
> > tried it in self launch gliders (without
> feathering the prop) both idling
> > engine and stoped, there is noticeably less drag
> when the prop was
> > stopped. Also it is better for the prop to stop
> vertically so any
> > vortices from the prop don't upset the air flow
> over the wing, so I'm told
> > but I couldn't tell the difference :-)
> >
> > regards
> > Barry Kruyssen
>
>
>
>
> _______________________________________
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monkey patriotic."
Scott Ritter
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