May 16 ATA Melbourne Aus meeting

[adrian_sm]

Yeah. It was a good night of shooting the breeze. Might have to organize something similar again sometime.

As for replacing a hall throttle with a button throttle. Yeah it is possible but nothing off the shelf to do it. The simplest version would be a voltage divider type network. Just measure the voltage your throttle spits out at zero and full throttle, and design the resistor network to match. There is probably a post floating around on this site somewhere that shows a schematic. Obviously that will be instant on/off. With no ramping up that happens at the moment while you twist your throttle. Might be okay for low power.

If you want ramping of the power then you might need to make things more complex with a capacitor. Or jump to digital world and use a little Arduino board like I do.

[full-throttle]

Thanks Adrian for organising - I had great time. Beers, pizza and bike talk
Good to see we agree on so many things.

Oh, and I've lost another 3 spokes on the c'lyte

Your bike goes well. That HS35 pulls very nicely. Hope it wasn't me breaking the spokes

[Kiwi]

Hi, was great to meet you all and talk bikes.

Have contacted Bafang to try to see if I can get a cassette motor like

and see what else they might sell me.

Adrain, have spent the morning looking for cells to make a compact Lipo pack, and lipo bms. Only http://www.hi-powercycles.com/ seem to be selling true lipo with a bms.
It amazes me that there is not a high rate lipo pack available commercially with bms. I found no sexy battery packs for in frame mounting. None.
I calculated 350x60x90mm case to fit about 440wh and bms and room for your speed controller and control board. As a guess.

I was very impressed with your friction drive and the potential simplicity to the user. Would be keen to represent them in NZ when they are sorted. Happy to help where I can, design, cad etc.

Kiwi

[Kabbage]

Have contacted Bafang to try to see if I can get a cassette motor like....

OOh. that looks really nice. Proper clearance for a real disc caliper, and can take a good quality 9sp cassette, rather than the rather rubbish one I have now... sweet. I'd buy one of them off you tomorrow Kiwi! (Sensored please)

Adrain, have spent the morning looking for cells to make a compact Lipo pack, and lipo bms. Only http://www.hi-powercycles.com/ seem to be selling true lipo with a bms.

Cripes, them's some $$ for just 500 cycles. And considering the base price of the Turnigy bricks, seems a bit exe.

[adrian_sm]

@ Kabbage. Pretty hard to beat Hobby King prices and their minimal overheads. But the other pack comes from a "real" store with BMS and will be closer to you ideal plug and play setup. You just have to pay the price for convenience and performance as always.

@ Kiwi.
Thanks for the great chat, we will have to stay in touch. I'll PM you my details.

As I said I would prefer to transition to a more modern safer chemistry/cells than RC LiPo. If only EIG had 10Ah cells in a nice form factor for bikes, then the ideas we threw around might fly. http://www.eigbattery.com/ I believe Zero are using these cells. http://www.eigbattery.com/eng/product/C020.pdf
174wh/kg & 370wh/L compared to a raw HobbyKing LiPo packs 140wh/kg, and 280wh/L.

Interesting that hi-powercycles have a 50Amp BMS on the pack they offer. I need to search a bit more on what off-the-shelf options there are. But I would probably be happy with just a balancing circuit since I control the rest of the system for my kit.

Thanks for the kind words on my friction drive. I'll definitely keep you updated on it's progress.

Cheers, Adrian