X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from rwcrmhc12.comcast.net ([204.127.192.82] verified) by logan.com (CommuniGate Pro SMTP 5.1c.2) with ESMTP id 1225970 for flyrotary@lancaironline.net; Thu, 06 Jul 2006 10:02:59 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.192.82; envelope-from=rlwhite@comcast.net Received: from quail (c-68-35-160-229.hsd1.nm.comcast.net[68.35.160.229]) by comcast.net (rwcrmhc12) with SMTP id <20060706140214m120008ei1e>; Thu, 6 Jul 2006 14:02:14 +0000 Date: Thu, 6 Jul 2006 08:03:27 -0600 From: Bob White To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Nothing to do with Rotary Engines, but.... Message-Id: <20060706080327.5b3340ee.rlwhite@comcast.net> In-Reply-To: References: X-Mailer: Sylpheed version 2.2.4 (GTK+ 2.8.3; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit 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. On Wed, 05 Jul 2006 23:23:24 -0600 "BillDube@killacycle.com" wrote: > At the moment, about the best that commercial Li-Ion rechargeable > cells can do is about 200+ W-hr/kg. > > In more familiar units, this translates to about 1/2 HP for an hour > for each pound of batteries carried. Basically, the weight in pounds > will be twice the HP times the number of hours that you want. > > Good for a motor-glider, but that is about it. > > > Bill Dube' > > > At 07:45 PM 7/5/2006, you wrote: > > >Really was something to see that Bike burn out... > > > >Or may even to skew Bob's comment some, How about 175hp for 20 minutes, then > >125hp for 4 hours, with a 30 minute 175hp reserve. > > > >Tony Snow (Bearhawk #753) > > > >-----Original Message----- > >From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On > >Behalf Of Bob White > >Sent: Wednesday, July 05, 2006 9:01 PM > >To: Rotary motors in aircraft > >Subject: [FlyRotary] Re: Nothing to do with Rotary Engines, but.... > > > > > >Very impressive indeed. Another one or two orders of magnitude > >improvement and we can forget the rotary and just put an electric motor > >up front (or out back if you're so inclined). Now that would be > >simple, reliable, and quiet too boot. How about it Bill? Can you give > >me 175 HP for 4-5 hours in 200 lbs or so? (Damn the cost, that would > >be worth taking out a new mortgage on the house.) ;) > > > >Bob W. > > > > > >On Wed, 5 Jul 2006 20:36:29 -0400 > >"Ed Anderson" wrote: > > > > > > > > > > Very impressed with your electric drag bike endeavors - got to be almost > >as > > > good as flying a rotary {:>) > > > > > > Ed > > > > > > Ed Anderson > > > Rv-6A N494BW Rotary Powered > > > Matthews, NC > > > eanderson@carolina.rr.com > > > http://members.cox.net/rogersda/rotary/configs.htm#N494BW > > > ----- Original Message ----- > > > From: "Bill Dube" > > > To: "Rotary motors in aircraft" > > > Sent: Wednesday, July 05, 2006 7:50 PM > > > Subject: [FlyRotary] Nothing to do with Rotary Engines, but.... > > > > > > > > > > This has absolutely nothing to do with rotary engines, but I thought I'd > > > > show you what has been distracting me from my airplane construction as > >of > > > > late. > > > > > > > > For those of you that don't already know, my other hobby is drag racing > >an > > > > electric motorcycle. (It takes a team of people to do this, not just > >me.) > > > > We recently managed to get sponsorship from A123 Systems. These > >batteries > > > > are like "Mr. Fusion" in the movie "Back to the Future." Enormous power > > > > and a bottomless pit of energy. The more I work with these batteries, > >the > > > > more impressed I become. > > > > > > > > Here is a clip of the bike doing a burn-out: > > > > > > > > http://www.killacycle.com/Burnout.wmv > > > > > > > > Here is a clip of the bike turning parts of the rear motor into > >molten > > > > copper as it goes down the strip: > > > > > > > > http://www.killacycle.com/Second%20Run.wmv > > > > > > > > We can do six burn-outs and six runs without recharging if we cared > > > > to. Maybe seven. > > > > > > > > The 170 battery pack puts out over 350 HP. The battery pack is 376 > > > > volts, 1350 amps, and has 18.4 A-hrs. We charge up in about 15 minutes > > > > after every run. > > > > > > > > I plan to start building airplane batteries with them soon, by the > >way. > > > > It will be late Winter, probably. A123 Systems batteries are ideal for > > > > aircraft. They are lightweight, powerful, robust, long cycle life, and > > > > very, very safe. I'm pretty sure I can build a battery that will crank > >500 > > > > amps, but will weigh less than 3 lbs. > > > > > > > > I guess it had something to do with airplanes.... :-) > > > > > > > > Bill Dube' > > > > > > > > -- > > > > Homepage: http://www.flyrotary.com/ > > > > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ > > > > > > > > > > > > > > > > -- > > > Homepage: http://www.flyrotary.com/ > > > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ > > > > > >-- > >http://www.bob-white.com > >N93BD - Rotary Powered BD-4 (first engine start 1/7/06) > >Custom Cables for your rotary installation - > >http://www.roblinphoto.com/shop/ > > > >-- > >Homepage: http://www.flyrotary.com/ > >Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ > > > > > > > >-- > >Homepage: http://www.flyrotary.com/ > >Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ -- http://www.bob-white.com N93BD - Rotary Powered BD-4 (first engine start 1/7/06) Custom Cables for your rotary installation - http://www.roblinphoto.com/shop/