X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [142.165.20.173] (HELO misav02.sasknet.sk.ca) by logan.com (CommuniGate Pro SMTP 5.1c.2) with ESMTP id 1228843 for flyrotary@lancaironline.net; Sat, 08 Jul 2006 11:47:00 -0400 Received-SPF: none receiver=logan.com; client-ip=142.165.20.173; envelope-from=hjjohnson@sasktel.net Received: from bgmpomr1.sasknet.sk.ca ([142.165.72.22]) by misav09 with InterScan Messaging Security Suite; Sat, 08 Jul 2006 09:46:15 -0600 Received: from home ([206.163.240.39]) by bgmpomr1.sasknet.sk.ca (SaskTel eMessaging Service) with ESMTPA id <0J2300FI5D53EBG0@bgmpomr1.sasknet.sk.ca> for flyrotary@lancaironline.net; Sat, 08 Jul 2006 09:46:15 -0600 (CST) Date: Sat, 08 Jul 2006 09:48:17 -0600 From: Jarrett & Heidi Johnson Subject: Re: [FlyRotary] Re: Nothing to do with Rotary Engines, but.... To: Rotary motors in aircraft Message-id: <000d01c6a2a5$ee153a70$6401a8c0@home> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 X-Mailer: Microsoft Outlook Express 6.00.2900.2869 Content-type: multipart/alternative; boundary="Boundary_(ID_ugtRuHJ4WAp0IkVgXRa3tQ)" X-Priority: 3 X-MSMail-priority: Normal References: This is a multi-part message in MIME format. --Boundary_(ID_ugtRuHJ4WAp0IkVgXRa3tQ) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Wendel, I was always under the impression.. 1Hp was 1 Hp regardless of how it was created.. The only convertion's I've heard of were.. 1Hp= 2Dp [Donkey power] , and 1Hp=1.5Mp [Mule power] :-) Jarrett ----- Original Message ----- From: Wendell Voto To: Rotary motors in aircraft Sent: Saturday, July 08, 2006 9:29 AM Subject: [FlyRotary] Re: Nothing to do with Rotary Engines, but.... What is the equivalent hp conversion of electric to gas engines? I'm thinking it is about 2:1 (tried to look it up quickly, couldn't find it), so instead of 180 hp, you would only need 90 hp electric. Wendell Subject: [FlyRotary] Re: Nothing to do with Rotary Engines, but.... Think about how small the alternators on big HP APU's are and you get the picture on how small you can make a powerful electric motor if you are willing to work at it a bit. You can easily make a 100 HP electric motor that weighs 100 lbs. It would not likely be DC, however. Electric motors for stationary use have no constraint on weight. The only reason you would want to make one lighter would be to save on materials and/or on shipping. If you make a motor of a given HP lighter, it will cost more, spin faster, or be less efficient than the heavier motor. If you are running on batteries, you must be careful not to save weight on the motor by compromising efficiency, only to add to the total vehicle weight by requiring more batteries to make up for the reduced motor efficiency. Bill Dube' george lendich wrote: Hi Bill, I'm relieved. I won't have to mortgage the house until the technology advances enough to reduces the weight by a factor of 5. Currently it looks like I would need about 1400 lbs of batteries. Get it down to 280 lbs and allow 100 lbs for the electric motor and my W&B will work out about right. :) I'm looking forward to seeing what you come up with for the aircraft batteries. Bob W. Bob or Bill I would have thought a 130hp DC Motor would weigh more than 100lbs. Any rule of thumb on weight of motor to power output ?- I guess there's a lot of copper windings per HP!? George (down under) -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ ------------------------------------------------------------------------------ No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.394 / Virus Database: 268.9.10/383 - Release Date: 7/7/2006 --Boundary_(ID_ugtRuHJ4WAp0IkVgXRa3tQ) Content-type: text/html; charset=iso-8859-1 Content-transfer-encoding: 7BIT
Wendel, I was always under the impression.. 1Hp was 1 Hp regardless of how it was created.. 
 
The only convertion's I've heard of were..  1Hp= 2Dp [Donkey power] , and 1Hp=1.5Mp [Mule power]  :-)
 
Jarrett
----- Original Message -----
Sent: Saturday, July 08, 2006 9:29 AM
Subject: [FlyRotary] Re: Nothing to do with Rotary Engines, but....

What is the equivalent hp conversion of electric to gas engines? I'm thinking it is about 2:1 (tried to look it up quickly, couldn't find it), so instead of 180 hp, you would only need 90 hp electric.
 
Wendell
 
 
Subject: [FlyRotary] Re: Nothing to do with Rotary Engines, but....

Think about how small the alternators on big HP APU's are and you get the picture on how small you can make a powerful electric motor if you are willing to work at it a bit. You can easily make a 100 HP electric motor that weighs 100 lbs. It would not likely be DC, however. 

Electric motors for stationary use have no constraint on weight. The only reason you would want to make one lighter would be to save on materials and/or on shipping. If you make a motor of a given HP lighter, it will cost more, spin faster, or be less efficient than the heavier motor. If you are running on batteries, you must be careful not to save weight on the motor by compromising efficiency, only to add to the total vehicle weight by requiring more batteries to make up for the reduced motor efficiency.

Bill Dube'

george lendich wrote: 
Hi Bill,

I'm relieved.  I won't have to mortgage the house until the technology
advances enough to reduces the weight by a factor of 5. Currently it
looks like I would need about 1400 lbs of batteries.  Get it down to
280 lbs and allow 100 lbs for the electric motor and my W&B will work
out about right. :)

I'm looking forward to seeing what you come up with for the aircraft
batteries.

Bob W.
    

Bob or Bill
I would have thought a 130hp DC Motor  would weigh more than 100lbs.
Any rule of thumb on weight of motor to power output ?- I guess there's a
lot of copper windings per HP!?
George (down under)



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