50 kw peak power ebike

[nechaus]

Who has done it?

 

[hillzofvalp]

That's a big number.. That's enough to get a 2 ton car moving fairlY fast

 

[nechaus]

I cant quite imagine it,
Only liveforphysics agni bike running 650 amps was that 72 volts? that's like 50ish kw.. that video keeps coming to mind.

I can imagine from 10/20 kw ebike the price would double doing 50 kw ebike build... beast controller, beast motor.
But if you were to ask me to drive an expensive Ferrari down the road or a crazy ebike, hands down, i would be walking towards the ebike not even looking at the Ferrari.

 

[Farfle]

IIRC lukes Sevcon/GM bike runs 800A at 105v nominal.

 

[nechaus]

800 phase amps or battery amps?
400 battery amps would be like 42 kw / 48kw, 800 amps that's like 82 /96 kw

80kw + give me goosebumps on my nuts

 

[gensem]

I wonder why Luke does not publish power figures...
His bike doesnt look even close to a 100hp machine in the last race vídeo.
Maybe he can push 80kw in a couple burst

 

[nechaus]

I wonder why luke does not publish power figures...
His bike doesnt look even close to a 100hp machine in the last race vídeo.

Its a bit of a mystery

 

[liveforphysics]

With the 10kw golden motor, we were pulling 780 battery amps on a 116v battery that would say to 105v at the controller.

Sounds like a lot, and it was a huge burden for the battery at 82kW. However, the motor was LESS than 50% efficient when dumping this much power into it, and smoke would start coming out after just a couple of seconds... So we dialed things down a bit to get a little above 50% efficient, somewhere around 650amps with a 108v battery voltage. No matter how much power you feed into the 10kw golden motor, you won't reach 50kw output.


That motor burned up and is being sent to Thud to be re-born out of the ashes with new windings like a phoenix!

 

[nechaus]

Would you consider running dual 10kw motors on that bicycle of yours ?
that could be DeathBike v5.0

 

[Philistine]

80kw + give me goosebumps on my nuts

I understand the attraction of testing your limits of empirical knowledge and experience (I too follow that righteous path), but be careful where it takes you my friend.

I always thought I wanted to see a man executed with a rocket launcher, then a few weeks ago I got to see the Taliban do exactly that to a man on theync.com, I suffered a terrible case of the buyers remorse.

The same thing happened to me when I asked a friend the other day why the bukake scene had never gotten past wine glasses and goblets, what about something bigger, you know, like vase sized? He looked at me like my other mate did when I asked what anal bleaching was, he took a deep breath and started rattling off a bunch of Japanese websites to me..... Like the Ring I couldn't help looking..... I am still unable to drink milkshakes weeks later.....

 

[nechaus]

20kw at good efficiency is as far as i go on a bicycle.

I don't think id ride anything more powerful than that unless it was geared to 40 kmh and just did insane burnouts.
80kw @ 90+ % efficiency might stop your heart from the pure enjoyment, fear, g force

 

[John in CR]

The harder part is making use of the big power. Mine peaks at 30kw, but that's just for less than a second as the motor crosses it's peak power rpm somewhere shy of 30mph. If my system could handle longer durations then gearing for a higher top speed could make use of more power. I doubt mine would take it, so I'm not going to try, I like the 10-50mph range of riding anyway.. I've got more power than I can handle already, so I'll leave more to the rest of you.

I'm sure Luke will be coming out with a drag bike, so he can put the power he's got to the pavement. He's was just cruising easily along as far as the motor was concerned with Deathbike last Saturday with no need to push it. Plus that's finally a toy he doesn't want to destructively test, though he's need a lot longer straights to even try.

John

 

[Doctorbass]

So the limit is now the motor

Maybe one of these Yasa motor would be a good deal. These can be used as hub motor i think and they are axial flux so it leave enough room for the battery and controller in the frame.

The next limit would be the frame torsion

yasa 400 can take 85kW continuous and 220Nm and weight only 20kg!

Doc

 

[Nuts&Volts]

So the limit is now the motor

Maybe one of these Yasa motor would be a good deal. These can be used as hub motor i think and they are axial flux so it leave enough room for the battery and controller in the frame.

The next limit would be the frame torsion

yasa 400 can take 85kW continuous and 220Nm and weight only 20kg!

Doc

I like the way you think on all accounts above. Would love a YASA, but I would do it justice and throw it into a motorcycle

 

[liveforphysics]

So the limit is now the motor

In deathbike at this race, we were dialing power back, and I lapping much faster, and having better more controllable wheelies with the reduced power.

Thats a pretty big sign the limitation is chassis more than motor at this point. The Sevcon size 6 was also getting pretty hot.

 

[Arlo1]

So the limit is now the motor

In deathbike at this race, we were dialing power back, and I lapping much faster, and having better more controllable wheelies with the reduced power.

Thats a pretty big sign the limitation is chassis more than motor at this point. The Sevcon size 6 was also getting pretty hot.

Your bike is suposed to be a bicycle!

 

[hillzofvalp]

Why would u say the limit ison an ebike within a college town., when will the power come to embarass one

 

[TylerDurden]

Your bike is suposed to be a bicycle!

I believe it has functional chain & pedals.

That said, a human powered lap or two would make a very interesting race.

 

[liveforphysics]

Your bike is suposed to be a bicycle!

I believe it has functional chain & pedals.

That said, a human powered lap or two would make a very interesting race.

I'm actually very much in favor of this sort of rule being added to the races. It would add a nicely increased danger factor to the race, crossing the line to come on power all exhausted and sweating and exhausted from trying to pedal in leathers and boots etc, then to have to perform with peak condition reflexes and reactions to race at speed under power. The super light bikes should likely see half a lap leads starting out, which would nicely level the field a bit I think. The MoPed guy I like to race against would have to run pushing his bike or something though. If someone wants to make that a rule, I'm game.

 

[Ypedal]

maybe have a " Pedal Final Lap " !

 

[Farfle]

I REALLY like that hehehe, the dual pie bike is only 6" wide at its widest point in the triangle

 

[Arlo1]

Its going to be a hard thing to police.

 

[Biff]

I also like the idea of last lap being pedal. That way the no-ped can compete in the unlimited race, while all the pedal powered guys (or people interested in totally exerting themselves) can continue on the last lap just pedaling and see how pedaling goes. I guess the downside would be that someone who got lapped, but had a really fast pedal bike, would have to do 2 pedal laps if they are going to win the race.

 

[John in CR]

A pedal only lap requirement too heavily penalizes any bike capable of regen without some kind of dog clutch engagement. Improvements in regen functionality should be one of the outcomes of racing, since racers need good variable regen more than anyone.

John

 

[Alan B]

Require batteries to be removable, leave them at the end of the first lap, pedal the lap, install the battery, then race. Enforcement is not a problem.

Would lead to improvements in plug-in and strap on battery setups.

Would make it easier to handle racing heats with multiple batteries.

Would make it a bit safer to separate batteries from bikes at various times.