X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail18.syd.optusnet.com.au ([211.29.132.199] verified) by logan.com (CommuniGate Pro SMTP 5.1c.2) with ESMTPS id 1230443 for flyrotary@lancaironline.net; Mon, 10 Jul 2006 02:30:14 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.199; envelope-from=lendich@optusnet.com.au Received: from george (d58-105-143-78.dsl.nsw.optusnet.com.au [58.105.143.78]) by mail18.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id k6A6TM4B024570 for ; Mon, 10 Jul 2006 16:29:23 +1000 Message-ID: <002101c6a3ea$33be44a0$4e8f693a@george> From: "george lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Nothing to do with Rotary Engines, but.... Date: Mon, 10 Jul 2006 16:29:30 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001E_01C6A43E.04D31DB0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_001E_01C6A43E.04D31DB0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I'm wondering if any of this sort of information is relative=20 (donkey reference aside) to use of electric water pumps and how they run = with reduced HP but seemingly provided sufficient coolant transfer, = even if they appear borderline power wise. George (down under) ----- Original Message -----=20 From: Jarrett & Heidi Johnson=20 To: Rotary motors in aircraft=20 Sent: Monday, July 10, 2006 10:46 AM Subject: [FlyRotary] Re: Nothing to do with Rotary Engines, but.... What I was alluding to is the Fact that gas engines produce torque = during a smaller portion of the 360 degree rotation. An electric motor = on the other hand puts out torque for 360 degrees. Hence when using an = electric motor to drive for instance, a pump; instead of a 4hp gas = engine one can use approximately a 2 hp and get the same pumping = efficiency - like amount of water moved. I think I came across the = formula in an old Grainger catalog but it isn't in the one I have now. = FWI Wendell ( I'll disregard the donkey crap statement for the donkey) Wendell, Actually it depends on the elect. motor as well. If its DC = then there is continuous torque put out, but if its a single phase = standard 1800 rpm motor.. it only puts out torque for 1/2 a rev. If its = a 3 phase motor its nearly back to 360 deg torque due to it changing = phases. However at the end of the day.. it still has to raise the lb's = so many feet to be 1 hp. =20 As far as the donkey comment.. I was just trying to inject a little = humor into a rather dry subject.. no offense intended. My appologies if = any was taken. Jarrett ------=_NextPart_000_001E_01C6A43E.04D31DB0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I'm wondering if any of this sort of = information is=20 relative
(donkey reference aside) to use of = electric water=20 pumps and how they run with reduced HP but seemingly provided  = sufficient=20 coolant transfer, even if they appear borderline power = wise.
 
George (down under)
----- Original Message -----
From:=20 Jarrett=20 & Heidi Johnson
Sent: Monday, July 10, 2006 = 10:46=20 AM
Subject: [FlyRotary] Re: = Nothing to do=20 with Rotary Engines, but....


What I was alluding to is the Fact that = gas=20 engines produce torque during a smaller portion of the 360 degree = rotation. An=20 electric motor on the other hand puts out torque for 360 degrees. = Hence when=20 using an electric motor to drive for instance, a  pump; instead = of a 4hp=20 gas engine one can use approximately a 2 hp and get the same pumping=20 efficiency - like amount of water moved.  I think I came across = the=20 formula in an old Grainger catalog but it isn't in the one I have=20 now. FWI
 
Wendell ( I'll disregard the donkey crap = statement=20 for the donkey)
 
 
Wendell,  Actually it depends on the elect. motor as = well.  If=20 its DC then there is continuous torque put out, but if its a single = phase=20 standard 1800 rpm motor.. it only puts out torque for 1/2 a rev. If = its a 3=20 phase motor its nearly back to 360 deg torque due to it changing = phases. =20 However at the end of the day.. it still has to raise the lb's so = many=20 feet to be 1 hp. 
As far as the donkey comment..  I was just trying to = inject a=20 little humor into a rather dry subject.. no offense intended. My = appologies if=20 any was taken.
 
Jarrett
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