X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [64.12.143.100] (HELO imo-m12.mail.aol.com) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTP id 2786624 for flyrotary@lancaironline.net; Tue, 11 Mar 2008 06:52:19 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.143.100; envelope-from=Lehanover@aol.com Received: from Lehanover@aol.com by imo-m12.mx.aol.com (mail_out_v38_r9.3.) id q.cad.2a886b5c (41812) for ; Tue, 11 Mar 2008 06:51:38 -0400 (EDT) From: Lehanover@aol.com Message-ID: Date: Tue, 11 Mar 2008 06:51:37 EDT Subject: Re: [FlyRotary] Re: direct drive- was Re: Anyone have an RD-1C for sale? To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1205232697" X-Mailer: Unknown sub 36 X-Spam-Flag: NO -------------------------------1205232697 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit A few years back, GE or P&W were running around to air shows with an unducted fan powered MD-80. It would take off early in the show and at the end make some very fast fly bys with just the one add-ball engine screaming, and the other conventional JT-8D shut down. It had addly shapped blades, and lots of them. The tips were well supersonic. Supposedly it was getting great mileage, and would be used today if the noise could have been overcome. With a rotary power they wouldn't have noticed the prop noise at all. Lynn E. Hanover In a message dated 3/11/2008 3:13:59 A.M. Eastern Daylight Time, lendich@optusnet.com.au writes: Lynn, That would be my take on it as well, a properly engineered shaft and bearings without the planetary. Although it would be a pretty small prop running at 3,000 to 5,000 RPM. The efficiency of the prop would be well down as well as the HP and Torque. A PP with high compression rotor would off-set some losses. Anything can be done. George (down under) **************It's Tax Time! Get tips, forms, and advice on AOL Money & Finance. (http://money.aol.com/tax?NCID=aolprf00030000000001) -------------------------------1205232697 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

A few years back, GE or P&W were running around to air shows with a= n=20 unducted fan powered MD-80. It would take off early in the show and at the e= nd=20 make some very fast fly bys with just the one add-ball engine screaming, and= the=20 other conventional JT-8D shut down. It had addly shapped blades, and lots of= =20 them. The tips were well supersonic. Supposedly it was getting great mileage= ,=20 and would be used today if the noise could have been overcome. With a rotary= =20 power they wouldn't have noticed the prop noise at all.

Lynn E. Hanover

In a message dated 3/11/2008 3:13:59 A.M. Eastern Daylight Time,=20 lendich@optusnet.com.au writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>

Lynn,
That would be my take on it as well, a properly engineered s= haft=20 and bearings without the planetary. Although it would be a pretty small pr= op=20 running at 3,000 to 5,000 RPM. The efficiency of the prop would be well do= wn=20 as well as the HP and Torque. A PP with high compression rotor would off-s= et=20 some losses.

Anything can be done.

George (down under)

It's Tax Time! Get tips, forms and advice on AOL Money=20= & Finance.

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