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At the moment, both dates are ok for me too (23th or 30th). Should be good fun. Mel

For current monitoring i have designed a small circuit, not too elaborate and very much like the CA. It takes the volt drop from a shunt resistor and uses the signal to override the throttle. You 'dial in' the amount of power usage taken from the battery. Far from being a distraction, i find...

Nick I would like to take part in this, however i have some reservations. I realistically i don't have the battery power to make the full distance unless i invest in some decent packs (i am thinking about it). I would like to see the route first (it sounds scary). Is the event aimed at...

At this moment any weekend dates are ok for me in August. It would be nice to see a few more folk to make it worthwhile.

Thanks Michael, just the info i needed. :0(

Can someone tell me, what is the max voltage of a 36V ping LiFePo4 pack after a full charge? I want to use a voltage regulator for my circuit (which will eventually be powered from a Ping battery pack). I have found plenty low cost devices, but the maximum input voltage is usually 40V. I know...

Yep. i'm up for a meeting there. Unfortunately can't make it on the 25th. Mel

I read a comment on the ES forum where someone said the best effeciency of a brushless motor was gained at 75% of the maximum motor speed. I don't know about that:confused:, i find that you can definately feel assistance at very low motor rpm. Therefore if you keep the speed down and use less...

I tend to travel as fast as a can. If that means the outer ring and a high gear, so be it. It wasn't difficult to reach the 15mph max speed of assist on my first Tongxin converted bike. Now it has a higher rpm motor the top speed is around 23mph of assist. For me that is plenty fast enough. Now...

You need traction control Frank:D Yes i have had the front slip but it's usually on damp ground. It's never been bad enough to alarm me. I have also had the rollers slip when i wound the throttle open at low speed, (you can hear this horrible grinding noise) i don't do this any more!! JohnP...

Was there some talk about a meet and ride in the new forest a while ago? Ideal place i would have thought. Fairly local for me as well:) Mel

Robin It was the current meter having problems being connected to my circuitry rather than the tongxin controller. It was giving weird readings. I decided to run 2 rechargable batteries rather than try to figure out what was causing the problem. Yep your right, i'm all for new experiments:)...

Hi Robin Firstly, in the case of the CA, i have no knowledge at all other than they are out of my budget for the needs i had. I expect they will have the bells and whistle's you speak of of. I thought of getting a 'wattsup' meter, very useful item for for the info they give you but not for...

Nick The shunt is wired into the battery pack, so the battery current is monitored and 'throttle clamping' controls the output current to the motor. So i guess you could say the motor current is limited. Whether this will prevent blown controllers is difficult to say, i hope it will. One of the...

The next test was riding the Tarka trail complete and back again. The real test for my current limiter was the gradual incline on the trail 449ft in 4 miles. With the minimum setting i could use very little power at wide open throttle to assist me. Most of the time when pedalling uphill only...

In the next picture, i've increased the threshold to maximum and given it full throttle with no pedaling. All on level ground. 10.9Amps and 18.5 mph and increasing As you can imagine trying to take pictures and ride safely was not really possible, so i abandoned that for the next test.

Following on from the discussion about Franks blown tongxin controllers i decided to make a current limiting device to have more control over battery consumption. I bought a 0-50A LCD display (complete with Shunt) from ebay as the base for the project. The voltage drop is 0-75mv for the...

My 2 cents I was tempted to get some marathon plus tyres after getting 3 punctures last winter. After looking at the specs i decided to get plain marathons with the kevlar strip protection instead. My thinking was, (knowing my luck) a thorn or spike could be longer than the silicon gel area...

That's interesting Frank. When i strapped a meter onto the handlebars to monitor my setup i noticed the current could reach 16A on occasions, and probably quite a bit more than the rated 12A. I just picked up a 260 rpm motor from JohnP this afternoon (need more speed).....looks like i'll have to...

Frank, i have around 400miles on my tongxin controller now. I am bit alarmed as to how many you have had go wrong. I was going to buy another kit, but you are giving me second thoughts, have i been lucky so far? What happens when they 'blow', do you get any idea they giving problems first or...