X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from email2k3.itlnet.net ([64.19.112.15] verified) by logan.com (CommuniGate Pro SMTP 5.1c.2) with ESMTP id 1228825 for flyrotary@lancaironline.net; Sat, 08 Jul 2006 11:18:13 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.19.112.15; envelope-from=jwvoto@itlnet.net Received: from rav.itlnet.net (unverified [192.168.10.149]) by email2k3.itlnet.net (Rockliffe SMTPRA 7.0.3) with SMTP id for ; Sat, 8 Jul 2006 10:17:23 -0500 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on rav.itlnet.net X-Spam-Level: X-Spam-Status: No, score=-1.4 required=5.0 tests=ALL_TRUSTED,HTML_MESSAGE autolearn=failed version=3.1.3 Received: from JWVOTO (unverified [64.19.115.114]) by mail.itlnet.net (Rockliffe SMTPRA 7.0.3) with ESMTP id for ; Sat, 8 Jul 2006 10:17:21 -0500 Message-ID: <004201c6a2a3$6133ee00$72731340@JWVOTO> From: "Wendell Voto" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Nothing to do with Rotary Engines, but.... Date: Sat, 8 Jul 2006 10:29:24 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003F_01C6A279.61BF3020" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 This is a multi-part message in MIME format. ------=_NextPart_000_003F_01C6A279.61BF3020 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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. =20 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.=20 Bill Dube' george lendich wrote:=20 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. =20 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/ =20 ------=_NextPart_000_003F_01C6A279.61BF3020 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

What is the equivalent hp conversion of electric to gas engines? = I'm=20 thinking it is about 2:1 (tried to look it up quickly, couldn't find = it), so=20 instead of 180 hp, you would only need 90 hp electric.

Wendell

Subject: [FlyRotary] Re: Nothing to do with Rotary Engines,=20 but....

Think about how small the alternators on big HP APU's = are and=20 you get the picture on how small you can make a powerful electric = motor if you=20 are willing to work at it a bit. You can easily make a 100 HP electric = motor=20 that weighs 100 lbs. It would not likely be DC, however. =20

Electric motors for stationary use have no constraint on = weight. The=20 only reason you would want to make one lighter would be to save on = materials=20 and/or on shipping. If you make a motor of a given HP lighter, it will = cost=20 more, spin faster, or be less efficient than the heavier motor. If you = are=20 running on batteries, you must be careful not to save weight on the = motor by=20 compromising efficiency, only to add to the total vehicle weight by = requiring=20 more batteries to make up for the reduced motor efficiency. =

Bill=20 Dube'

george lendich wrote:=20
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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