BATRIBIKE SPRINT.......More Power Than A Horse?

Hi people, i was just trying to work something out.

My BATRIBIKE SPRINT is less than ONE year old and the crankshaft has FAILED FOUR OR FIVE times (I think lost count to be honest)

SNAPPED - like a carrot THREE times and seemed to have 'GROWN' ONE time, then the pedal chewed the crank up.

First two SNAPPED pulling away from a standing start

Third one just seemed to GROW - The mechanic at www.batribike.com insists he 100% fitted

a BATRIBIKE SPRINT crank but one day the pedal came off looking down the thread seemed to

be out 1 1/2" ish. I had no need to touch it, running fine, apart from having to tighen up the crank bolt every mile or so when CRUNCH. So as the mechanic clearly knows what he is doing, he must have fitted a BATRIBIKE SPRINT crank. Was running then stopped flicking the sensor off the crank.

Ends up with YET another crank and Steve Coulson. Director at Fallowgate Ltd. T/A Batribike

took some photographs and marked the crank, brilliant fine who ever fitted it, it's their finger prints on it.

The last crank was approx 300 miles ago, today i was just singing do-wah-diddy-dum-diddy-day, for saftey reasons, no tapping fingers or shuffling feet, gets a "SHHH, SHHH" noise thought is that the chain guard AGAIN, then gentle SHHNAPP wasn't looking at the speedo, if i was it would have been the number of miles on the trip and how far DOWN the battery gauge was, got to have been MAX 8MPH - just exited a gate type thing.

Maybe i'm too strong for the metal? (NEVER try to pull wheelys on it)

My theorey is this:-

We are not into EXCAT numbers just round numbers, so we assume

A 12 VOLT 100 Amp car alternator with APPROX the 'same' 1/2 inch shaft size as a cycle crank

so that will do for an example. Some car alternators

are 130 AMPS!

1 horsepower is 746.5 WATTS - so lets convert 100 amps at 12 volts into watts

Converting Amps to Watts

The conversion of Amps to Watts is governed by the equation Watts = Amps x Volts

100 x 12 = 1200 WATTS - so lets divide that by horsepower

1200 / 746.5=1.60750167448

So ok we have an answer, the 1/2" alternator shaft will happly take 1.6 horse power.

I have snapped THREE and managed to make ONE grow.

Is there any horses on here that want a game of tug of war?

Does anybody elese have any ideas? to what is happening?

Thanks

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