Posted by Michael B on February 16, 2010, 6:31 pm
Transmissions run backwards have other problems,
as I understand.
> Once you pass the five or six to one ratio, belts and chains don't
> work at all well. At least trying to do it in one step. You'd be
> better looking at some sort of gearbox. Salvaged from something with
> an ICE but used the other way round.
> Or gearbox and belts, depends what you can find,
Posted by ghio on February 17, 2010, 5:01 am
> I'm building a VAWT. It will have a very slow speed, high torque.
> So to be effective, I'm going to need to gear it up for speed.
> Average wind speed in this area is 9.8 miles/hour. My turbine
> would be turning at about 12 RPM. So I'll likely need some very
> long V-belts. What's the longest they make, like for a very big fan?
> Has anyone used flexible cable for something like that?
V-belts absorb energy, There is a lot of drag on them.
Chains are more efficient.
Then there is the VWAT that uses a fly wheel to provide more torque.
The idea was that the turbine was used to spin up the flywheel. When
it reached a predetermined speed the alt/ gen would be energized thus
producing electricity until the flywheel fell below another preset
speed and shut off the alt/ gen to allow the flywheel to spin up to
speed again. If I remember it right the clutch was a aircon pulley
that could be switched on and off.
Posted by JIMMIE on February 18, 2010, 10:02 pm
> I'm building a VAWT. It will have a very slow speed, high torque.
> So to be effective, I'm going to need to gear it up for speed.
> Average wind speed in this area is 9.8 miles/hour. My turbine
> would be turning at about 12 RPM. So I'll likely need some very
> long V-belts. What's the longest they make, like for a very big fan?
> Has anyone used flexible cable for something like that?
Check with Gates
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> work at all well. At least trying to do it in one step. You'd be
> better looking at some sort of gearbox. Salvaged from something with
> an ICE but used the other way round.
> Or gearbox and belts, depends what you can find,