FS Frame + Cromotor + Lipo

[oatnet]

Spinning around...

Thanks Gensem, that was a fun video. Every time you look down at your battery box I do a double take, since that is the same one I used on my enduro. You are lucky you can ride around the highway like that, here I would have a pair of CHP's on my ass inside of a mile.

-JD

[gensem]

Its not a highway.. I would probably run into trouble if that was.
Highways around that area are limited to 75mph.

[gensem]

I was expecting a better footage.
Still funny tho

[sn0wchyld]

I was expecting a better footage.
Still funny tho

lol
was anyone else half expecting/hoping he slammed into the pole with a comical 'DONNNNNNGGG' sound?

hope he was ok. looks like he rolled an ankle pretty badly.

[oatnet]

I was expecting a better footage.

Pretty clear of the end of his wipeout - did he say what happened, it looked like the rear wheel was stepping out to the left?

-JD

[MadRhino]

The footage is pretty clear for a surveillance camera. Lucky he wheelied the bike right in the field of view of a cam, and did it before going too fast. My friend wheelied the bike out of the first turn, he had gained some speed already and did a slide all the way to the curb.

[gensem]

I was expecting a better footage.

Pretty clear of the end of his wipeout - did he say what happened, it looked like the rear wheel was stepping out to the left?

-JD

Maybe one of the nuts was not holding the axle properly because another friend also had a crash one day before this one. Either way leaning forward would save his ass.

[gensem]

The footage is pretty clear for a surveillance camera. Lucky he wheelied the bike right in the field of view of a cam, and did it before going too fast. My friend wheelied the bike out of the first turn, he had gained some speed already and did a slide all the way to the curb.

There should be another camera footage in the opposite side, but i dont why there was nothing recorded.

[gensem]

hope he was ok. looks like he rolled an ankle pretty badly.

Knee and ankle were hurt, but not much because he was lucky to fall at low speed.

[shock]

That's awesome you got it on tape, glad to hear your bud was (relatively) ok!

To me it looks like he simply pulled a wheelie and didn't know how to handle it, or freaked out, as evident by pulling the bars full left, and shifting his weight left, as soon as the front tire came up. Balance is very important on 2 wheels, and critical on one wheel! Newbs tend to forget about the rear brakes in a unwanted wheelie situation. Seen it a hundred times.

[teklektik]

If you're going to keep lending that out, you need to install a 'valet mode' switch - or get more insurance.

[oatnet]

Balance is very important on 2 wheels, and critical on one wheel! Newbs tend to forget about the rear brakes in a unwanted wheelie situation. Seen it a hundred times.

This is why I had concerns about the 9kv winding of the cromo - Super High Torque is a lot of fun to play with on a light ebike, and great for offroad and hills, but it presents a lot of challenges for normal street riding, or infecting people with the EV grin by letting them ride the bike. There is only so far you can take torque before it becomes too much to handle without skills far better than mine. Some people like to ride with the front wheel in the air, I had enough of it a few years back and started chasing RPMs instead of burnouts. We've found the edge of the envelope for torque, but high speed is still a growing frontier.

One could reduce torque by going to a larger diameter wheel - like the 26"/700c accountant envisioned for the 9kv wind - but then one can't buy tires rated for the speeds it could achieve.

-JD

[MadRhino]

One could reduce torque by going to a larger diameter wheel - like the 26"/700c accountant envisioned for the 9kv wind - but then one can't buy tires rated for the speeds it could achieve.

It does wheelie easily in a 26" wheel, all my motors and even the lightweight H motor can lift the front at 20 Mph on all my bikes.
Good 26" tires to speed 70 Mph are available if you don't mind DH racing knobs.

Only limiting power, or altering geometry, can keep the front wheel down.

[gensem]

Oatnet i ll not deny that having less torque would help. It sure would, but having better throttle modulation is what changes the game. And you ll probably be able to have a progressive (adaptive) throttle with CA v3 soon.
Still the 3 turn hub motor sounds like the best option for the enthusiasts in ES.
Once again I vote for a cromotor that's about the same size of a magic pie having magnets as thick as is this one, with a 13-15Kv in an aluminium stator weighting 13kg total.
Game?

[gensem]

One could reduce torque by going to a larger diameter wheel - like the 26"/700c accountant envisioned for the 9kv wind - but then one can't buy tires rated for the speeds it could achieve.

It does wheelie easily in a 26" wheel, all my motors and even the lightweight H motor can lift the front at 20 Mph on all my bikes.
Good 26" tires to speed 70 Mph are available if you don't mind DH racing knobs.

Only limiting power, or altering geometry, can keep the front wheel down.

I dont really think tires are an issue, unless you have too much Ah to ride for hours or you have a shitload of HP to strip the thread before noticing.

[John in CR]

Oatnet i ll not deny that having less torque would help. It sure would, but having better throttle modulation is what changes the game. And you ll probably be able to have a progressive (adaptive) throttle with CA v3 soon.
Still the 3 turn hub motor sounds like the best option for the enthusiasts in ES.
Once again I vote for a cromotor that's about the same size of a magic pie having magnets as thick as is this one, with three turns of cooper in an aluminium stator weighting 13kg total.
Game?

3 turns is too much. Hubmonster, my motor with a 50mm wide 265mm diameter stator is 1.5 turns, and it has a Kv of about 15. My 40mm X 200mm motors are 2 turn and have a Kv of 16. Wider stator with same turns reduces Kv.

[gensem]

Oatnet i ll not deny that having less torque would help. It sure would, but having better throttle modulation is what changes the game. And you ll probably be able to have a progressive (adaptive) throttle with CA v3 soon.
Still the 3 turn hub motor sounds like the best option for the enthusiasts in ES.
Once again I vote for a cromotor that's about the same size of a magic pie having magnets as thick as is this one, with three turns of cooper in an aluminium stator weighting 13kg total.
Game?

3 turns is too much. Hubmonster, my motor with a 50mm wide 265mm diameter stator is 1.5 turns, and it has a Kv of about 15. My 40mm X 200mm motors are 2 turn and have a Kv of 16. Wider stator with same turns reduces Kv.

You are right again John, I should use Kv and not winding turns. ( to be truth I ll refrain from using turn countinfg until in confident again)
When I say 3 turns in my last post, consider 13-15kv

[John in CR]

That Kv with the big diameter and wide stator will be a monster on a street ebike. I'm about to find out for sure, though mine is probably 15lb heavier than a trimmed version in a skinny moped rim and tire could be. I finished the controller mount tonight, and hope to wire it up tomorrow...by Wednesday for sure it will be on the road. It won't be like Luke's (did you see his onboard videos of Saturday's race?), but I have to leave that kind of performance to young crazy guys. Triple the power and a whole lot more torque than my daily rider should be loads of fun. It might even seem dangerous enough that I have to wear some safety equipment.

John

[oatnet]

Oatnet i ll not deny that having less torque would help. It sure would, but having better throttle modulation is what changes the game. And you ll probably be able to have a progressive (adaptive) throttle with CA v3 soon.

Yeah, I can't wait to try that V3 throttle control. Isn't Justin great?

Once again I vote for a cromotor that's about the same size of a magic pie having magnets as thick as is this one, with three turns of cooper in an aluminium stator weighting 13kg total.
Game?

Came.
In my pants.

[shock]

Wait a sec..

Is it possible to use an aluminum stator? I didn't think so, as aluminum does not magnetize, and the windings themselves won't make much Gauss without the iron in the middle. Or am I missing somthing?

I think an idea with merit would be a 2 stage winding, where say half the turns could be "engaged or disengaged" via 3pSt switch

[gensem]

When I said alu, I was thinking of something like this



2pie hub motor from Farfle.

[shock]

I got ya, an AL insert! That's sweet.

[fabiograssi]

Gensen, any improvements on throttle response?

[gensem]

Gensen, any improvements on throttle response?

Not really, I sorta gave up messing with the throttle after CA v3 was announced.

[shorza]

Gensem, do you mind showing me how you made your Pelican case removable?