X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-ma01.mx.aol.com ([64.12.206.39] verified) by logan.com (CommuniGate Pro SMTP 5.3c3) with ESMTP id 3998136 for flyrotary@lancaironline.net; Tue, 01 Dec 2009 16:43:59 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.206.39; envelope-from=WRJJRS@aol.com Received: from imo-da03.mx.aol.com (imo-da03.mx.aol.com [205.188.169.201]) by imr-ma01.mx.aol.com (8.14.1/8.14.1) with ESMTP id nB1LhAbK027210 for ; Tue, 1 Dec 2009 16:43:11 -0500 Received: from WRJJRS@aol.com by imo-da03.mx.aol.com (mail_out_v42.5.) id q.c50.5e47f32f (42809) for ; Tue, 1 Dec 2009 16:43:07 -0500 (EST) From: WRJJRS@aol.com Message-ID: Date: Tue, 1 Dec 2009 16:43:07 EST Subject: Re: [FlyRotary] Re: Next generation re-drive To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1259703787" X-Mailer: 9.0 for Windows sub 5132 X-Spam-Flag:NO X-AOL-SENDER: WRJJRS@aol.com -------------------------------1259703787 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en =20 Pat is correct of course. I have used many magnetically coupled devices fo= r=20 transmitting power in vacuum. The common problem with using them for power= =20 transmission is that they are Heavy, (capital H). The other thing to find= =20 out is if the devices will scale as high as 300 HP. How big will they be= at=20 that size? I hate to be a naysayer but the strongest magnets I have ever= used=20 wouldn't work, and still fit in an airplane! I would love to find out that= =20 advances in materials would make this possible for us, but don't bet the= farm=20 on it. Bill Jepson =20 In a message dated 12/1/2009 11:25:56 AM Pacific Standard Time,=20 Panzera@Experimental-Aviation.com writes: =20 =20 and if you get a prop strike the magnetic gears spin free so you wind up= =20 replacing just the prop instead of the prop, the PSRU and some expensive= =20 engine parts. =20 I=E2=80=99m not so sure about that.=20 If the magnetic coupling is strong enough to transmit 200-300 HP from the= =20 engine to the prop, =20 an abrupt stoppage of the prop will get transferred to the crank.=20 Pat =20 =20 =20 =20 =20 =20 -------------------------------1259703787 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en

Pat is correct of course. I have used many magnetically coupled devic= es for transmitting power in vacuum. The common problem with using them fo= r power transmission is that they are Heavy, (capital H). The other thing= to find out is if the devices will scale as high as 300 HP. How big will= they be at that size? I hate to be a naysayer but the strongest magnets= I have ever used wouldn't work, and still fit in an airplane! I would lov= e to find out that advances in materials would make this possible for us,= but don't bet the farm on it.

Bill Jepson

In a message dated 12/1/2009 11:25:56 AM Pacific Standard Time, Panze= ra@Experimental-Aviation.com writes:

and if you get a= prop strike the magnetic gears spin free so you wind up replacing just th= e prop instead of the prop, the PSRU and some expensive engine parts. &nbs= p;

I=E2=80=99m not so= sure about that.

If the magnetic coup= ling is strong enough to transmit 200-300 HP from the engine to the prop,=

an abrupt stoppage= of the prop will get transferred to the crank.

Pat

&nbs= p;

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