Recent content by Heros

Intuitive thinking says bigger wheels are better, but let's examine... Rolling resistance in reality do not decrease linearly with radius, in fact in many experments i have made it has almost no effect. The mass of the actual wheel may increase with square of radius, so a wheel that is twice the...

Not that much, i can touch it after a 15 minutes elite cyclist test.

Yes that's it, data pairs. I measured them by putting the motor on a very high place, the motor has a pulley of a known diameter, and i winded many different known wheights... I left the motor accelerate until a terminal speed, when wheighttorque+braketorque=0, then i just measured the speed.

And if magnetics would get saturated, the curve would loose slope as speed increases, not getting more slope as it does.

All dc motors/generator use the same force font, current, and it flows through copper en all the cases, i don't see why that much interest in the motor itself. I can guess light bulbs have non-linear behavior, but that's exactly the opposite that i got, a perfect straight line, and when...

Sorry, i jumped off what i though that was obvious, but nothing is obvious... When a permanent magnet motor moves, creates an electromagnetic force over the electrons in the copper windings, that can be assumed as a kind of voltage, called "lenz force", that "voltage" creates a current across...

Hi berkeman, thanks for your reply. Its a 750 watts 48 volts chinese motor, i measured last week a 28 amp top. But i don't think that's the reason, because at near zero speed the curve at short circuit had a very similar K than 8 bulbs in parallel.( 0.006235 and 0.006153 respectively).

Hi, i didnt know where to put this question cos its kind of multitopic, here is why... I am working on a better way to take mechanical energy from muscles, i made a teste bench for pedalling in very different ways, including traditional(circular) pedalling, the thing is. I am measuring the power...

Ok i think i got it, and i had the same question. I think here are two posibilities: 1-The combustion is constant pressure because diesel enters to the combustion chamber in a liquid state and have to reach "flash point" to ignite and maybe, as liquids, they need a not so high pressure to go on...