kris27 wrote:What I am trying to say - One can not fight with laws of physics. There for the laws, rules, regulations ...... should be sensible, based on some kind technical and/or scientific facts.
No, laws should not be based on some kind of technical and/or scientific facts. The science should not be IGNORED, but neither should it be the sole desideratum.
Practicality and a look at the greatest good for the greatest number should also be put into the mix.
Motor, it is linear motor, on my bike spins the wheel ( unloaded, I mean wheel is not touching a thing ) at maximum of 250 rpm. So in theory I can get on 26" wheels, speed around 30 k/h. If motor is ON - if I exceed 250 rpm, controller turns on to "recharge" so motor actually becomes a generator, and you can feel this ... gets quite hard to pedal.
My trikes have both got Heinzemann 200/400 watt motors. This motor (from memory) is governed to 193 rpm. This means on one trike with a 16" drive wheel it maxes out at 16 km/h and with the 26" wheel it maxes at 24 km/h. However, unlike your example, if I exceed this speed is does NOT become "hard to pedal". It simply ceases to drive the wheel. Thus there is no impediment for me to go faster than the max motor speed, as would appear in your example. So if I understand your example (and please correct me if you think I am wrong) the more POWERFUL the motor, the more drag it will generate at over-speed. Thus it would seem that your motor governs your speed to 30 km/h, unless it is not under power. So why bother with a more powerful motor?
Secondly, one of the rather feeble arguments that electric vehicles (of any type) come up against is "Oh, it's not really green, is it? I mean, you're still getting CO2 pollution from the power station to charge your batteries." And "Your batteries have a lot of embedded pollution in their manufacture, so your e-vehicle isn't that green, is it?"
So the more powerful your motor, the bigger batteries you will require, and the more power you will need to draw from the grid to recharge.
Thus the arguments noted above have a grain of truth - under certain circumstances.
In order to counter these, (and for other reasons, such as lower cost and greater flexibility) I built my electric system to be able to run
entirely off the sun, using photovoltaic panels on board.
These are new panels (about 3 weeks old), which replaced large, less efficient ones I fitted last year.
Even at this time of year, the ammeter tells me that they are pushing just a smidge under .3 amps into the batteries (at 28 volts - causing the regulator to cut in). When summer time comes I'm hoping for about .4-.5 amps.
Quite literally I simply leave my trike in the sun, and its batteries are always charged. Because I only use the motor
as it is meant to be used (ie to assist me away from a stop or to climb a hill - NOT to provide constant drive ) then I never have a "flat battery". And because of this I don't need to carry such large batteries, hence the whole outfit is lighter, and uses less material.
Though I haven't yet tried it out fully (I'm waiting for summer) I suspect that my new PV panels will enable me to travel further faster than I would with your BIGGER motor and batteries, since I have little or no need to worry about conserving power.
Your physics may be correct, but you're not applying common sense.
Joe
To acquire immunity to eloquence is of the utmost importance to the citizens of a democracy
Bertrand Russell