X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from paris.boulder.noaa.gov ([140.172.10.145] verified) by logan.com (CommuniGate Pro SMTP 5.1c.2) with ESMTP id 1226621 for flyrotary@lancaironline.net; Thu, 06 Jul 2006 19:22:48 -0400 Received-SPF: none receiver=logan.com; client-ip=140.172.10.145; envelope-from=William.P.Dube@noaa.gov Received: from [140.172.241.126] (mungo.al.noaa.gov [140.172.241.126]) by email.boulder.noaa.gov (iPlanet Messaging Server 5.2 HotFix 2.01 (built Aug 26 2004)) with ESMTPSA id <0J2000H5V8WT0X@email.boulder.noaa.gov> for flyrotary@lancaironline.net; Thu, 06 Jul 2006 23:22:05 +0000 (GMT) Date: Thu, 06 Jul 2006 17:16:30 -0600 From: Bill Dube Subject: Re: [FlyRotary] Re: Nothing to do with Rotary Engines, but.... In-reply-to: To: Rotary motors in aircraft Reply-to: William.P.Dube@noaa.gov Message-id: <44AD99CE.30202@noaa.gov> Organization: NOAA Aeronomy Lab MIME-version: 1.0 Content-type: multipart/alternative; boundary="Boundary_(ID_QKg1B2vQZ2fNqYfyp+4fHQ)" X-Accept-Language: en-us, en User-Agent: Mozilla Thunderbird 1.0.2 (Windows/20050317) References: This is a multi-part message in MIME format. --Boundary_(ID_QKg1B2vQZ2fNqYfyp+4fHQ) Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7BIT It is all about duty cycle and cooling. The motors in my electric drag bike are rated at just 13 HP each, continuous duty. I run 170 HP through each for just a few seconds. Bill Dube' Bob White wrote: >You could be right George. 100 lbs was a complete WAG on my part. I >did a quick search on google, but couldn't find any engine weights vs >hp, but I did find a site where someone made an electric drag car out >of a RX-7. http://www.dragtimes.com/Mazda-RX-7-Timeslip-7519.html > >They mentions using a 42 HP electric motor, but generating 300 HP from >it for the drag time. Apparently electric motor hp and gasoling engine >hp don't correlate. I'll leave it to Bill to give a knowledgeable >answer. :) > >What is the hp rating and weight of the motor on your bike Bill? > >Bob W. > > >On Fri, 7 Jul 2006 08:11:33 +1000 >"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/ >> >> > > > > --Boundary_(ID_QKg1B2vQZ2fNqYfyp+4fHQ) Content-type: text/html; charset=ISO-8859-1 Content-transfer-encoding: 7BIT It is all about duty cycle and cooling.

The motors in my electric drag bike are rated at just 13 HP each, continuous duty. I run 170 HP through each for just a few seconds.

Bill Dube'

Bob White wrote:

You could be right George.  100 lbs was a complete WAG on my part.  I
did a quick search on google, but couldn't find any engine weights vs
hp, but I did find a site where someone made an electric drag car out
of a RX-7.  http://www.dragtimes.com/Mazda-RX-7-Timeslip-7519.html

They mentions using a 42 HP electric motor, but generating 300 HP from
it for the drag time.  Apparently electric motor hp and gasoling engine
hp don't correlate.  I'll leave it to Bill to give a knowledgeable
answer. :)

What is the hp rating and weight of the motor on your bike Bill?

Bob W.


On Fri, 7 Jul 2006 08:11:33 +1000
"george lendich" <lendich@optusnet.com.au> 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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