Alternative engines

[Raymond C Drouillard]

On Thu, 22 Apr 1999 20:43:43 -0400 (EDT) William T Wilson
<fluffy at snurgle.org> writes:
>On Thu, 22 Apr 1999, Kurek, Larry wrote:
>
>> Huh? How does it accelerate if it has no torque? Maybe they just
>> didn't gear it correctly. Maybe a CVT type of transmission is needed
>> to keep the rpm up and multiply the torque accordingly. With
>> electronic controls, it would be
>
>Maybe.  Don't most turbines spin something like 30,000 RPM?  It's a lot.
>And they don't really produce any torque at all until they get up to a
>substantial portion of that.  You'd need a 20:1 final drive ratio to get
>"normal" performance, so that won't do.  What I would recommend is a
>reduction before you feed into the transmission.  Before the clutch,
even.
>I wouldn't trust most transmissions to take that much RPM on the 
>input.
>

On the other hand, you could use a really small automotive transmission
to handle the small amount of torque.  You would have to make sure that
the bearings are rated for high speeds and the gears are balanced, but
the weight savings alone would be great.

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