Another way of looking at it is ( ignoring gear loss) gears do not change power at all . since power is torque times speed for example if a gearbox doubles torque it will halve speed so the product remains the same .
but motors , props, wheels etc all work most efficently at certain speed-torque combinations so the aim is to choose a gear ratio that matches the optimum speed-torque of the prop to the optimum speed-torque of the motor .
Chris S
--- In electricboats@yahoogroups.com, Kevin <pembertonkevin@...> wrote:
>
> Torque is increased when reduction gearing is used. The amount of
> reduction increases torque. boat drives rely more on torque than HP as
> do most drives. The advantage of reduction drives is the lower load on
> the motor that the motor will try to provide thus increasing the
> temperature of the motor to the point of burning up the windings. Much
> of the motor design relies on cooling the motor for the desired rating.
>
> You can get more power out of a motor if you can cool the motor enough.
> External fans help with this, because the fan no longer relies on the
> motor speed.
>
> Hope this helps.
>
> Kevin Pemberton
>
> On 08/02/2010 09:51 AM, Daniel Michaels wrote:
> >
> > Thanks I have been doing more research and found EMC-RT Motor which
> > seems like it is going to do the trick. I am trying to find out now if
> > I still have to use a gear reduction with this motor.
> >
> > Dan
> >
> > --- On *Mon, 8/2/10, Ron /<rlgravel@...>/* wrote:
> >
> >
> > From: Ron <rlgravel@...>
> > Subject: [Electric Boats] Re: Hello
> > To: electricboats@yahoogroups.com
> > Date: Monday, August 2, 2010, 11:46 AM
> >
> > HP will not increase, a gear reduction drops the output speed and
> > increases the twist force on a slower turning application.
> >
> > --- In electricboats@yahoogroups.com
> > </mc/compose?to=electricboats%40yahoogroups.com>, "Daniel"
> > <nov32394@> wrote:
> > >
> > > Hello I just joined. I own a Pearson Triton 28' sailboat that I
> > plan on using electric power for. I have a small amount of
> > information but I always like more. One of the biggest questions I
> > need answered is the speed of the motor. Lets start out with a
> > golf cart type motor. Does it have the same power at 800 rpm as it
> > does at 1,600 rpm? Do you want to use a reduction drive on an
> > electric motor if you are going to run it at a slower speed?
> > >
> > > Does an Electric motor work the same as an ICE as far as gearing
> > it down? With an airplane you get more hp the faster the engine
> > goes so putting a reduction gear on gives you more hp.
> > >
> > > Dan
> > >
> >
>
> --
> Ubuntu10.04, Acer AspireOne, Virgin Mobile 3G Broadband2go.
> Doesn't get any better than this!
>
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