I’d love to give you such control over settings but I’m now not allowed to thanks to EN15194 2017!you are missing the point i want control over the motor settings and power levels
and i told you no one would buy those lol.
Are you measuring the torque at the driven wheel there?Its not scientific ebiker99, although it should be!! The power is the same but because of where the torque is measured 50Nm hub is the same roughly as 100Nm centre. All the best, David
yeah well thats not much tbh id want 10m after the first year of production from my bikes id give ppl what they want performance wise and access to change any motor settings.
It was a terrible blow Soundwave we had expected to sell at least £10 millions worth in the first few months. But hey ho life goes on!!yeah well thats not much tbh id want 10m after the first year of production from my bikes id give ppl what they want performance wise and access to change any motor settings.
On the hub yes.Are you measuring the torque at the driven wheel there?
Sorry, I don't understand your answer.On the hub yes.
All the best, David
With a crank motor, the torque at the back wheel depends on which gear you're in and the actual gearing. You can change it with different sized chain-wheels or bottom gear sprockets. You can get 1000Nm if you want. Also, it depends on your pedal speed. You only get max torque at low pedal speed, where the motor isn't so efficient.Sorry, I don't understand your answer.
Let me put it another way (and thanks to Woosh for his clarification), what will be the full production model torque from the hub and mid motors?
Indeed, Woosh explained the torque specification issue earlier.With a crank motor, the torque at the back wheel depends on which gear you're in and the actual gearing. You can change it with different sized chain-wheels or bottom gear sprockets. You can get 1000Nm if you want. Also, it depends on your pedal speed. You only get max torque at low pedal speed, where the motor isn't so efficient.
What's more important is real world torque that you feel when riding around, and having enough torque to make your steepest climbs. This is where you see the difference in users friendliness between the two types of motor.
Once you escape from the paradigm of 36v, hub-motors can normally provide all the torque most riders would need. I prefer 48v, which gives 33% more torque than the equivalent 36v system.
You have to specify the conditions. Do you want maximum torque at the back wheel that you can't actually use, stall torque, torque at 8 mph in bottom gear, max torque at normal pedal cadence, torque at 15 mph or what?Indeed, Woosh explained the torque specification issue earlier.
This is why I'm asking Wisper for the full production model torque from the mid motors as measured at the chainring. We can then use the number of teeth at the chainring and sprockets to calculate the maximum torque available at the driven wheel. The only reference see is on Wisper's first post: "I should also say that the demo Mid Motor is only producing 75Nm, the same as the Bosch CX or Shimano E8000, so not at the full production model power."
I ask this because I'm interested to see how the maximum torque at the wheel compares between the hub and crank driven Wisper bikes. With cars, diesel engines have far more torque per cc than petrol engines which nicer when pulling away and going up steep hills.
For cycling in hilly areas I'm referring to the torque available to assist the rider in cycling up hill in a low gear with reasonable speed, comfort and cadence.You have to specify the conditions. Do you want maximum torque at the back wheel that you can't actually use, stall torque, torque at 8 mph in bottom gear, max torque at normal pedal cadence, torque at 15 mph or what?
The low voltage directive says 50v AC and 75V DC. I can't believe that the machinery directive would do anything other than point to the low voltage directive. My guess is that you've been misinformed. Can you tell us the source of your information?A question for you tech gurus.... The Machinery Directive tells us that we cannot use a battery with a maximum Voltage of more than 50V. When our 43V battery is fully charged it reaches a tad over 50V so we are within the rules. When we see systems advertised as 48V are these actually 43V systems or is their maximum Voltage actually much higher and outside the Machinery Directive regs?
I will dig up the paperwork but my information came from The Light Electrical Vehicle Association Europe. (LEVA EU)The low voltage directive says 50v AC and 75V DC. I can't believe that the machinery directive would do anything other than point to the low voltage directive. My guess is that you've been misinformed. Can you tell us the source of your information?