Yes. What both these two guys note is that it is relative to the motor efficency and the forever load of drag ( rolling, gravity and air). The calculation I described above do not take that into account: pure acceleration of mass equations.. not including the coefficients or rolling resistance ( friction ) and air ( friction), or how many times I speed up or slow down during a certain ride ( variable) (
power is dissipated for
every acceleration.. and also
every deceleration, that mus be accounted for if we were to look at the problem empirically.. and these things
add up) ....
Rolling and air become more exponentially the higher the speeds get. Ebike speed/power ratio is not encroaching high power 140-200mph Moto territory, where it begins to take a huge amount of power to overcome both air friction and rolling ect... ( hence fairing on rocketbikes and airplanes or they are never achieving the speed @ the power to fly or race)
Alot of it is to have the horsepower available for acceleration, vs not. I would always rather have Hp available for acceleration personally on any bike... Think of "Hp" as "how fast the WORK is done"... and if you have the available tq ( created through the winding) to accelerate (positive torque making acceleration) (Acceleration equals delta velocity divided by delta time.) (deltaV/deltaT) ( acceleration is not deltaV... DeltaV implies constant acceleration)...( delta-V is simply a change in velocity)( we look at acceleration here, not only the change in velocity, so we bring in Time), yes we all like that. The torque profile of a hub motor vs speed vs efficiency well defined and enumerated.
Well, no longer a simple question, Eh?
.. so on ebike the drag is not to great ( until over 30-50mph).. and a good "blip" on the throttle to get fast acceleration to the speed desired WILL save some energy consumption VS if you were to slowly creep up to speed ( and inherently spend more time in the lower less efficient range of motor speed and consumption) ...
Yes I would say you could "blip throttle " up to speed where the motor is happy and ride there more efficiently, than if you were to spend ( more) time in the driving tq regions of the motor rpm.
This is the
beauty of a well setup and chosen efficiency range for the power levels used, and the scourge of any bad motor manufacturer... Try to get every bit of work out of the energy input... effectively... and hubs and mids are designed around this.
Both those guys are correct. ^^^ I was negating all rolling resistance and air drag in my eq example for sure.
Personally, I am a power junky, and IF I can accelerate like a demon I will, and doing this repeatedly uses more energy ( and goes faster more, gets to higher top speeds earlier, and result spend more time in the high consumption area of my ride, even thought my motor is 8-10% more efficient at 40mph vs 35mph.. ( I end up going
farther ( distance)
faster ( less time) and using more energy storage...
braking more ( wasted umph, er, I mean energy) and
accelerating more ( more umph!!!, more grinning and winning!!!! ) more often (inherently) .. and it is 60-70% more efficient at 90% of top speed than at 10% of top speed... (very inefficient when going low speed on my hub) ..
Always remember, when it comes to electric motors... it takes lots of power to spin it up, but less power to keep it spinning...
The distance is less at the faster rate, then the work is the same, ( same top speed same work but longer/shorter distance) but consider time, and throttle applications ( power to speed) and speed load ( wind rolling) ... and very well will take more. ( same distance same accelerations = different amount of work done)
The acceleration ( decrease in range) is really negligible.. unless you start stop alot and do it fast ( city driving mpg)... Unless you are drag racing
! At 20 A .. yes I go slow(er) top speed and get 40 miles.. but at 50A I go pretty fast accelerations and power to get to top speed and get 22miles.. much closer to the 15-16 miles I get at the absolute max of 100A.... mostly at top speed... ( I waste alot of heat here too, ).. not much differences in range, but still some cause of the increased ( difference of) distance and increased ( decreased) work done.