FS Frame + Cromotor + Lipo

[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?

[gensem]

its nothing fancy... but I try take some pics (maybe a vid) in the coming days.

[gensem]

Being working alot lately and brazilian customs are holding good for 90 days now thats why I dont have updated this thread.
I plan on installing the new battery tray on monday, so I should be able to get a pictures of the monting.
Btw I think I ll also receive the dual front disks, caliper, etc on monday.

[gensem]

Dual front brakes arrived, they look good (not as good as gators) and are very light. I hoping to get the frame soon so I can test it.
Im having a hard time taking picture now because my cell phone broke.

[oatnet]

Dual front brakes arrived, they look good (not as good as gators) and are very light. I hoping to get the frame soon so I can test it.
Im having a hard time taking picture now because my cell phone broke.

Great, I was thinking about these for a while, and I am really looking forward to your feedback on how they work out for you.

-JD

[gensem]

Dual front brakes arrived, they look good (not as good as gators) and are very light. I hoping to get the frame soon so I can test it.
Im having a hard time taking picture now because my cell phone broke.

Great, I was thinking about these for a while, and I am really looking forward to your feedback on how they work out for you.

-JD

I got dual gators for Hal/Accountant, but i need the hose splitter and one adapter for the oposite side caliper.
The ones I got now are the Hygia ones, so I ll be able to compared thoses guys sometime in the future, im not sure what they are made of, but even with a steel hose the weight is about 1.5-1.6kg.

[Rodney64]

Gensem, Still happy with with your fast track frame. Thinking of buying one for my Son

[gensem]

Gensem, Still happy with with your fast track frame. Thinking of buying one for my Son

Im not using the bike much lately, not because its fault, just because I got a new contract that is too far to do with it.
Talking about the frame, its a quality frame for the price, im playing with 6kw and the frame is still holding strong. If you plan to a do sane commuter is a really good choice.
For serious power I would recommend something with a longer swingarm.

[gensem]

This project is not dead! I just have being very busy lately.
Here is a photo of my new extended dropout, they are almost ready to be glued to the bicycle alu swing arm.




I also plan to raise the power after getting the bike running again to something in 8-10kw range if the 18fet controller that I have allows me.

[gensem]

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

I forgot to take a picture for you... but I ll do it!

[gensem]

Ok, im back from a spin with the new extended dropouts.

Things noted

DP420 seems to be strong enough to hold the bike together.
6-7kw is boring now that the bike is not a wheelie machine during aceleration.
My fork is just too flexy, really need a stiffer single crown fork... any sugestions for 20mm axles ?

Pics ll come later...