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Re: [PSUBS-MAILIST] Hp vs hp

To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Hp vs hp
From: Ian Roxborough <irox@ix.netcom.com>
Date: Mon, 26 Sep 2005 18:55:06 -0700
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On Fri, 23 Sep 2005 15:32:36 -0700 (PDT)
Dave Banks <noperiscope@yahoo.com> wrote:

> That's a good way of putting it Ian.....I just picked up a sweet 90 KW
> 350 amp Gen set.  How big of an electric motor can I run continuously?? 

I'm not really sure.  But, at a guess, I'd think you could use it to
power an electic motor with a continuous rate of 50% to 80% of the
continuous rating of the generator.  I might be leaning a little far
on the side of caution.  Say 60HP to 95HP?

This would all depend on the energy loss during the power transmission
and how much you're willing to spend on elimating the loss.  Additional
energy will be lost if the output of the generator requires modification
for the motor (i.e. the Generator outputs 120v AC and the motor takes
300v DC).

> I'm good at pressure vessels and view ports  but the electric voodoo
> thing......this HP thread ,,,gas vs wire is cool............ Dave 

It is voodoo, or certainly can seem that way, even when you have
the theory.  I've found searching for 'electic car conversion'
on google.com can yield a lot of information from people who have
been playing around with this stuff for a while.

Cheers,
  Ian.
 
> Ian Roxborough <irox@ix.netcom.com> wrote: 
> Ah, right. I see what Captain Kittredge and Michael are talking about.
> 
> The rating given to a combustion engine is it's maximum peak horse
> power (it's a marketing thing to sell more cars). When using a car,
> you don't get peak power all the time, just for short bursts, most
> of the time you're using a 1/2 to 1/3 of the power. Also, you can't
> go above this rating without modifying the engine (adding turbo
> chargers, and other engine mods).
> 
> The rating given to electric motors is normally it's continous
> duty power output - i.e. what it should be used for most of the
> time. But, the electric motor is capable of a lot more peak 
> power output, say around x2 to x3 (depends on the motor, some
> are less than x2) for short periods of time.
> 
> I read this on a website for converting cars to electric.
> 
> Ian.
> 
> On Fri, 23 Sep 2005 08:41:02 -0400
> "Dan H." wrote:
> 
> > Why you'll find a difference when using electric rather then internal 
> > combustion is; with internal combustion you get your peek power at the top 
> > of it's, rather pointy, power curve, near it's highest RPMs. Electric 
> > motors, have a more constant power curve until they are really bogged down. 
> > Even then, they don't stop trying or stall. That is, they just keep trying 
> > harder, until they blow a fuse or fry themselves. An electric motors can 
> > take a short burst of exceeding it's rating but only until the added heat it 
> > generates destroys it.
> > 
> > Some motors are rated for constant duty and some are rated with duty cycles.
> > 
> > You can't get something for nothing. Brian is correct.
> > > Horsepower is the same no matter what source it is coming from.
> > >
> > > 1 HP = 746 watts
> > This is in a perfect world. In reality, you don't get all 1 HP of power to 
> > use, since each way of converting the 746 watts of energy to motion has it's 
> > inefficiencies, causing a power loss.
> > 
> > Dan H.
> > 
> > ----- Original Message ----- 
> > From: "Brian Cox" 
> > To: 
> 
> > Sent: Friday, September 23, 2005 12:35 AM
> > Subject: Re: [PSUBS-MAILIST] Hp vs hp
> > 
> > 
> > > Horsepower is the same no matter what source it is coming from.
> > >
> > > 1 HP = 746 watts
> > >
> > > Brian
> > > ----- Original Message ----- 
> > > From: "Michael Holt" 
> > > To: "Personal Submersibles List" 
> 
> > > Sent: Thursday, September 22, 2005 8:07 PM
> > > Subject: [PSUBS-MAILIST] Hp vs hp
> > >
> > >
> > >> Did we ever resolve the question about the difference between horsepower
> > >> produced by
> > >> steam engines, etc., and horsepower produced by electric motors? On
> > >> Captain Kittredge's
> > >> video, I recall that he said that HP for electric was twice (or half?)
> > >> the output of HP from
> > >> any other source.
> > >>
> > >> What triggered this question was the Amfibidiver site. It had a link to
> > >> a hovercraft site.
> > >> Thesmallest hovercraft is supposed to have either a 3-7 HP gasoline
> > >> engine or a 1-2 HP
> > >> electric motor.
> > >>
> > >>
> > >>
> > >> Mike
> > >>
> > >>
> > >>
> > >>
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References:
- Re: [PSUBS-MAILIST] Hp vs hp
  - From: Ian Roxborough <irox@ix.netcom.com>
- Re: [PSUBS-MAILIST] Hp vs hp
  - From: Dave Banks <noperiscope@yahoo.com>

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