can we turn 10rpm into 1500rpm mechanically?

[energia9]

Hi follks
can we turn 10rpm with some torque torque into 1500rpm mechanically?   perhaps a stupid question from a person who dont know much about this.
can someone help me out how i could turn very low rpm into  high rpm with mechanical means?
is it possible at all. 
??

thanks

[TinselKoala]

Use a bicycle transmission. Big chainwheel, little cassette.

[energia9]

Use a bicycle transmission. Big chainwheel, little cassette.

Thanks TinslKoala
in terms of efficiency,
how many percent of energy is being lost during this conversion?   rough estimate

Thank you

[Paul-R]

He needs a 150:1 ratio, TK. Tall order. Certainly, a custom made big wheel small wheel system would work or a gearbox or two.

[CANGAS]

A 10:1 and a 15:1,  and with each being at 97% with good quality chains and sprockets is not a huge loss.

Yes, the standard engineering rule of thumb is that a setup of two sprockets and a chain, any ratio, loses between 1% and 10% depending on the perfection of your installation.

Likewise, in a gear train, any situation of two gearwheels meshing together loses 10%.

Don't clearly remember the numbers for belt drives, but think about many motorcycle riders who have converted their scoots from factory belt drive to chain drive for higher performance. Probably about 5% loss for timing belt type drive and 10% for car fan belt flanged drive.

I would suspect that the most efficient type of drive would be a pure friction system. Two toothless wheels spinning together, like a car tire on a chassis dynamometer pulley. Don't know of any commercially available, and you would surely have fits making one.


Your welcome
CANGAS 107