Return-Path: Received: from bewersdorff.com ([192.220.83.90] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with SMTP id 2577968 for flyrotary@lancaironline.net; Sat, 13 Sep 2003 02:47:11 -0400 Received: (qmail 50668 invoked by uid 21338); 13 Sep 2003 06:47:10 -0000 Received: from unknown (HELO rapunzel) ([216.101.149.124]) (envelope-sender ) by 192.220.83.90 (qmail-ldap-1.03) with SMTP for ; 13 Sep 2003 06:47:10 -0000 From: "Marko Bewersdorff" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: EM2 Survey & Specs Date: Fri, 12 Sep 2003 23:41:13 -0700 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00F1_01C37987.59E82DC0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) In-Reply-To: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 This is a multi-part message in MIME format. ------=_NextPart_000_00F1_01C37987.59E82DC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit MessageI planned to use an optical sensor to compare the flywheel to the redrive input since there are rubber gizmos that flex a certain ammount. only problem someone pointed out is that they change their stiffnes with temperature. The idea behind torque is that that is true horsepower at the shaft - just multiply by rpm and some constant. In PT6 turboprop engines there is a helical gear that excerts pressure on a hydraulic piston which then is read out in the cockpit as pounds of torque. Maybe there is a pressure sensor in form of a washer that fits into the Tracy redrive under the thrustbearing. re Marko I want Torque. I'd also like a large display. Marko Guess I could calculate torque based on calculated HP & rpm, but would that really add anything? If I could think of a low cost way to measure it directly, that would be a nice thing. Alas, cheap ways to do that are hard to come by. Paul Lamar suggested an annular piston (to sense pressure) behind the sun gear but I don't think that is either simple or cheap. At least not for the guy that actually has to do it. Tracy ------=_NextPart_000_00F1_01C37987.59E82DC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
I=20 planned to use an optical sensor to compare the flywheel to the redrive = input=20 since there are rubber gizmos that flex a certain ammount. only problem = someone=20 pointed out is that they change their stiffnes with temperature.=20
The=20 idea behind torque is that that is true horsepower at the shaft = - just=20 multiply by rpm and some constant.
 
In PT6=20 turboprop engines there is a helical gear that excerts pressure on = a=20 hydraulic piston which then is read out in the cockpit as pounds of=20 torque. 
 
Maybe=20 there is a pressure sensor in form of a washer that fits into the = Tracy=20 redrive  under the thrustbearing.
 
re
Marko
 
I=20 want Torque.
 
I'd also like a large display.
 
Marko
 
 
Guess I could calculate torque based on calculated HP & = rpm, but=20 would that really add anything?   If I could think of a = low cost=20 way to measure it directly, that would be a nice thing.   = Alas,=20 cheap ways to do that are hard to come by.  Paul Lamar = suggested an=20 annular piston (to sense pressure) behind the sun gear but I don't = think=20 that is either simple or cheap.  At least not for the guy=20 that actually has to do it.
 
Tracy
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