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Bob, I suspect that you can apply more voltage than the motor is rated for to get extra power - probably a question of how long the motor can take it. A dragster's time is over in few fractions of a second - so the motor may not have caught fire, but I'll bet its smoking {:>). A road racer might be a different story. Just a wag on my part, Bill would clearly know.
Ed
----- Original Message ----- From: "Bob White" <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, July 06, 2006 7:05 PM
Subject: [FlyRotary] Re: Nothing to do with Rotary Engines, but....
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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N93BD - Rotary Powered BD-4 (first engine start 1/7/06)
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