Recent content by kartopla

You sound like you really know a lot. Can I ask you a question? I just burned out my rc hoobyking speed controller running a friction bike drive. Something smelled funny and I opened it up and one of the MOSFETS blew up. My question is does each phase coming out of the speed controller have 2...

I put an amp meter and volt meter and a load on the motor as a generator. Pedalled pretty fast and got about 4 or 5 amps and 26volts out of it. I want to be able to charge the batteries this way. Are there any electronics gurus out there that really understand regen. If the motor is spinning...

Very cool setup, and professional. Way too pretty for me. I like functional and ugly. I'm sure the bearings might fail, and I should add a support on the other end, but now I'm obsessed with adding regerative braking to my setup with a 3 pole contactor that disconnects the motor from the speed...

Hi folks, just finished working on a friction drive from an old kolmorgan motor with a burnt speed controller. I used a hobbyking 70 amp speed control. ($20). I made a custom pulley on a small lathe from an old cross country ski machine. The round stock from the ski machine was bored out to...

Great fab skills and welding. I use the same motor on my friction drive trike. One note. Chain is dang noisy. I use a gates belt for a 3 to 1 primary. Then use chain. Much quieter. Chain on the primary sounds like a motorcycle if its number 35. I'm not sure about 25.

I was never the greatest in math, I was wondering if anyone knows how to solve a math problem described below. If you have a lipo with a nominal capacity of 1000mah or 10ah and you discharge it first at 0.2C Capacity After standard charging, laying the battery 0.5h, then discharging at 0.2C5A to...

Thanks a million

Hey, does anyone know how to easily join two aluminum lipo tabs together and including a copper wire with plain old solder. I'm paralleling two 2200 mah lipo's and like an idiot I peeled off the spot welded tab attached to the aluminum tab. Now I can't solder the aluminum tabs. I guess I'll...

I just recently put a timing pulley on a currie motor shaft with a spring pin. You drill the hole about 10 thousands of an inch smaller. I think. The pin has a long slit along its length and will compress into the smaller diameter hole when forced in with a press or hammer. I know if your...

I just built a simple servo tester a few days ago using a 555 timer. I have a 20 year old novak controller and I wanted to use it on an ebike. It doesn't get too warm. I'm not sure if anyone here remembers the orange colored rc car novaks. They were actually made in the USA. A little pricy...

It fairs up hills fine if I'm peddaling to. I really just need to pedal from a stop to about 6mph because the friction drive will slip a little. My ratio is about 13:1 but the motor still gets quite hot. This 350 watt drive is balanced pretty well with pedalling. They compliment each other. An...

Hello fellow alternative transportation addicts. I made the following trike and installed a simple friction drive on it. It's not super fast but then again riding in the streets of chicago on a trike as low as a go-cart to the ground, you don't want to go too fast. I road about 10 miles on it a...

8) Hey that's the coolest fabric covering I have seen to date. Looks very professional.

:D I was able to put the hall sensors back in place after I tested them. So what is the cheapest 24-36v 300-400 watt controller I can get? Someone please help?

Thanks for the advise fellow ebikers