Tidal Energy, can anyone help?

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I am working with Griffith Uni Q on a new type of energy system.
I need a bicycle sprocket with 240 teeth.
Any ideas?

tidalenergy@yahoo.com.au:

Two chances on the 240 teeth ..... but, curiousity has got the better of me ..... what are you building ?

Originally posted by old&slow
Two chances on the 240 teeth ..... but, curiousity has got the better of me ..... what are you building ?

I am a director of an emerging renewable energy company that has just achieved a worlds best result from harvesting energy (kinetic) from moving water.

The shaft rotation while achieving huge torque is low at around 15-20 rpm so in order to achieve maxium electrical current out the rpm of the generator/alternator needs to turn at 1300 rpm.

As bicycle sprocket and chain gears are in thenorder of 98% efficientas well as being able to be easily serviced in the developing world where units are to be deployed bike technology has been selected for investigation into it's suitability.

So, we need to learn if there is a 240-50 tooth sprocket available "off the shelf' from some where...............can YOU help?

Sorry Aaron, I think you may have misinterpreted my Aussie slang - 2 chances = none and Buckleys = not possible. You'd need to use two shafts and compound gears to get anywhere near it. The largest generally available bike chainwheel is 55 tooth.

Originally posted by old&slow
Sorry Aaron, I think you may have misinterpreted my Aussie slang - 2 chances = none and Buckleys = not possible. You'd need to use two shafts and compound gears to get anywhere near it. The largest generally available bike chainwheel is 55 tooth.

Thanks.

We ahve accxess to an engineering shop so will get a couple done up.

Regards
Aaron