Re: 12V motor @ 24V

["Philippe Borges" <philippe.borges@freesbee.fr>]

Peter the pocketbikes use 6 and 7 teeth on 10hp ICE with no problems !

Philippe

Visitez mon site sur les véhicules électriques
www.vehiculeselectriques.free.fr
----- Original Message -----
From: "Peter VanDerWal" <peterv@peoplepc.com>
To: <ev@listproc.sjsu.edu>
Sent: Sunday, September 30, 2001 9:05 AM
Subject: Re: 12V motor @ 24V


> > Hi Pete,
> >
> > I have a single stage that is basically a complete hub, and have a 44
> tooth
> > pedal ring milled to fit over the bearing housing and bolt onto the
> opposite
> > side of the hub. This would give me a tad over 7:1, but I think it still
> > isn't enough perhaps. Maybe it would work fine at 12 volts this way.
>
> You're using a 6 tooth sprocket??!!?  No wonder you keep having problems
> with the chain jumping off.
> You need to use a 11 or 12 tooth sprocket on the motor.  Efficiency goes
> south fast when you get under 12 teeth, 11 is not to bad but less than
> that...
> Besides anything under 10 teeth and you'll have a hard time keeping the
> chain on at high chain speeds.
>
>
> >
> > I have a 65 tooth pedal ring made of very thick steel from an old
exercise
> > bike, but it weighs so much. I fear it would be best applied directly to
a
> > wheel, rather than on an inter-stage assembly where the inertia won't be
> > given back when coasting.
> >
> > I'm totally confused about what you mean by the cup, and a bottom
bracket.
> I
> > may need pictures for this one. Must be names of bike parts that I'm not
> > familiar with.
>
> You don't know what a bottom bracket is?  You really need to read a book
on
> bicycle maintenance, it will make your life much easier.
>
> The bottom bracket is the part of the frame where the crank-arms (the bits
> connected to the pedals) go through.
>
> Ignoring different types of threads there are two basic types of bottom
> bracket assemblies.  The older style that uses loose bearings and the
newer
> style that uses sealed bearings.  Either way they both thread in the same.
> The parts that hold the bearings in the frame are called cups.
> The most common thread used in the bottom bracket is also the same size
and
> pitch as the freewheel assemblies that thread onto the rear wheel (not the
> cassette hubs).  If you take the freewheel apart (careful there are
> approximately 19,376 tiny little bearings in there) you can remove the
pawls
> in there and it will freewheel in both directions.
>