Return-Path: Received: from [65.54.169.59] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 574131 for flyrotary@lancaironline.net; Mon, 20 Dec 2004 11:54:31 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.169.59; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Mon, 20 Dec 2004 08:54:01 -0800 Message-ID: Received: from 65.54.98.161 by BAY3-DAV29.phx.gbl with DAV; Mon, 20 Dec 2004 16:53:57 +0000 X-Originating-IP: [65.54.98.161] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Fw: [FlyRotary] Re: George Graham glide update Date: Mon, 20 Dec 2004 11:49:45 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0102_01C4E68A.0033DA10" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0009.2900 Seal-Send-Time: Mon, 20 Dec 2004 11:49:45 -0500 X-OriginalArrivalTime: 20 Dec 2004 16:54:01.0136 (UTC) FILETIME=[81521B00:01C4E6B4] This is a multi-part message in MIME format. ------=_NextPart_000_0102_01C4E68A.0033DA10 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I would think so too. The report I got on high drag from a freewheeling = prop was a story about a redrive that used a sprag clutch as the = anti-torsional resonance device. It also lets the prop freewheel when = the engine stops. The story said that there was very high drag in this = mode. =20 It does not add up so I think there were other factors at work. Tracy From: Tom=20 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.=20 Tom --- Bob White > 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. >=20 > Bob White >=20 > On Sun, 19 Dec 2004 15:41:53 -0500 > "Tracy Crook" > wrote: >=20 > 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 : ) > >=20 > > Tracy=20 >=20 > --=20 > http://www.bob-white.com > N93BD - Rotary Powered BD-4 (soon) >=20 > >> Homepage: http://www.flyrotary.com/ > >> Archive: = http://lancaironline.net/lists/flyrotary/List.html >=20 __________________________________=20 Do you Yahoo!?=20 Yahoo! Mail - Helps protect you from nasty viruses.=20 = http://promotions.yahoo.com/new_mail >> Homepage: http://www.flyrotary.com/ >> Archive: = http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_0102_01C4E68A.0033DA10 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I would think so too. The report I got on high drag from a=20 freewheeling prop was a story about a redrive that used a = sprag clutch=20 as the anti-torsional resonance device. It also lets the = prop=20 freewheel when the engine stops. The story said that there was = very high=20 drag in this mode.

It does not add up so I think there were other factors at = work.

Tracy

From: Tom

I wonder if a free-spinning prop on a broken tranny = would not=20 have the same
drag as a spinning prop which is turning the=20 motor?    I'd be inclined to say
they would differ.=20

Tom

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

>=20 Somenone else recently reported a spinning prop having negligable=20 effect
> on engine out glide. (Dave Leonard maybe?). = I'm=20 thinking that the
> biggest effect occurs with a C/S prop that = goes to=20 flat pitch when it
> looses oil pressure. I think twins = often use=20 feathering props for that
> reason.
>
> Bob = White
>=20
> On Sun, 19 Dec 2004 15:41:53 -0500
> "Tracy Crook" = <lors01@msn.com> wrote:
>=20
> He glided about 20 miles from an altitude of only 5000 = ft with=20 the prop
> freewheeling!   I've heard several times = that a=20 freewheeling prop (no
> engine drag on it) would generate lots = of=20 drag. Another sacred cow shot
> down : )
> > =
>=20 > Tracy
>
> --
> http://www.bob-white.com
> = N93BD -=20 Rotary Powered BD-4 (soon)
>
> >> = Homepage: http://www.flyrotary.com/
> = >> Archive:   http://lancai= ronline.net/lists/flyrotary/List.html
>=20

__________________________________
Do you = Yahoo!?=20
Yahoo! Mail - Helps protect you from nasty viruses.
http://promotions.yahoo.com= /new_mail

>> =20 Homepage: http://www.flyrotary.com/
>&= gt; =20 Archive:   http://lancai= ronline.net/lists/flyrotary/List.html

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