Record breaking

[camerart]

Hi,

I watched with interest as Sir Bradley beat the 1hour record, and woke up with a question!

What would the minimum requirements be for an e-bike to = his time?

Camerart.

 

[trex]

I believe the BBS02 48V 750W kit can be that fast (the record is 54.536km/h). Also are most 1.5kw - 2kw direct drive kits.
The velodrome has perfect riding condition for speed, no gradient and no headwind.

 

[Deleted member 4366]

You wouldn't need a crank drive because you'd only be going one speed. Bradley's bike didn't have gears. Any motor could do it whether geared or not. It makes no difference. You just need a motor that can sustain about 500w for an hour. It would need to spin up to about 460 rpm. 72v would be a convenient voltage to get that speed. Consumption would be about 750 watts, so two 11.6ah 36v batteries in series (835wh), should do it. You'd still need a sreamlined bike and riding gear. If you wanted to do it on a normal MTB, you'd need about 1500w from the battery and a big DD motor.

 

[selrahc1992]

Hi,

I watched with interest as Sir Bradley beat the 1hour record, and woke up with a question!

What would the minimum requirements be for an e-bike to = his time?

Camerart.

would it be against the rules to use someone in a vintage car to generate a partial vacuum in front of one?
http://www.core77.com/posts/25260/tom-donhous-experiments-in-speed-the-fastest-fixed-gear-ever-25260

 

[Artstu]

vintage

a bit too new for vintage, more classic. Guy's gone faster,

 

[camerart]

would it be against the rules to use someone in a vintage car to generate a partial vacuum in front of one?
http://www.core77.com/posts/25260/tom-donhous-experiments-in-speed-the-fastest-fixed-gear-ever-25260

Yes, as long as the car was powered by the same battery pack, so I think you can answer it yourself.

C.

 

[camerart]

No, as long as the car was powered by the same battery pack, so I think you can answer it yourself.

Got my YES mixed up with my NO

C.

 

[camerart]

You wouldn't need a crank drive because you'd only be going one speed. Bradley's bike didn't have gears. Any motor could do it whether geared or not. It makes no difference. You just need a motor that can sustain about 500w for an hour. It would need to spin up to about 460 rpm. 72v would be a convenient voltage to get that speed. Consumption would be about 750 watts, so two 11.6ah 36v batteries in series (835wh), should do it. You'd still need a sreamlined bike and riding gear. If you wanted to do it on a normal MTB, you'd need about 1500w from the battery and a big DD motor.

That's quite amazing, if Sir Brad, produced 1.5Kw for an hour.

C.

 

[Deleted member 4366]

That's quite amazing, if Sir Brad, produced 1.5Kw for an hour.

C.

He wasn't riding a MTB!

Also, 1500w is from the battery, not output power.

 

[soundwave]

now that's how fast i wanna go , for 60 miles

 

[camerart]

He wasn't riding a MTB!

Also, 1500w is from the battery, not output power.

I don't know how to re-phrase the question?

C.

 

[Ajax]

You wouldn't need a crank drive because you'd only be going one speed. Bradley's bike didn't have gears. Any motor could do it whether geared or not. It makes no difference. You just need a motor that can sustain about 500w for an hour. It would need to spin up to about 460 rpm. 72v would be a convenient voltage to get that speed. Consumption would be about 750 watts, so two 11.6ah 36v batteries in series (835wh), should do it. You'd still need a sreamlined bike and riding gear. If you wanted to do it on a normal MTB, you'd need about 1500w from the battery and a big DD motor.

Would you be peddling too on that contraption, or just sat on as a passenger.

• 

 

[camerart]

Would you be peddling too on that contraption, or just sat on as a passenger.

• 

No peddling, I was interested to see how much power Sir Brad used in an hour for that distance. In as similar e-bike as possible to Sir Brads.

C.

 

[EddiePJ]

Eric Barone is the man.

 

[Deleted member 4366]

If you used an electrified version of BW's bike and wore the same streamlines gear and rode it in the same velodrome, somewhere around 350w to 450w is my estimate.

 

[soundwave]

 

[mfj197]

The really good time triallers / climbers can output 400 watts for an hour or so. Brad did 440 watts on one time trial but I forget which one.

 

[camerart]

If you used an electrified version of BW's bike and wore the same streamlines gear and rode it in the same velodrome, somewhere around 350w to 450w is my estimate.

Thanks d8veh, also mfj197. That seems about right.

I just had a thought about bikes I had in the 60s. BSA winged wheel and Cyclemaster. I looked up the BHP and this type of bike was about 450W also.

Incidently, I learnt to 'speedway' on a Cyclemaster on a snow covered tennis court.

C.