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Old 06-04-09, 10:50 PM   #1
GTALuigi
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Any more fellow BionX users in this forum besides me?

Just checking...

Also wondering if any of you have hit that invisible wall of speed drag.

the one you hit after you have unlocked the max speed setting, and the one before you hit before the 50km safety break

so by factory default you are maxed at 25km/h
after you unlock that you can go as fast as you want but only if you go on a long steady phase

it wont let you say jump from say 3km to 49km no matter how fast you pedal

but if you reach past 50km/h speeds you will see the Regen (G) kicking in automatically to slow you back down to 49Km/h

when i first saw that happen i was like WTF!!! in my head, but then after repeated same results i noticed it is a new safety net they put in place, probably knowing every one will unlock the 3773 25km/h limit.

the 50km/h limit doesn't really bug me as much, there are not enough stretch of roads in my commute to reach that speed often.

however it does annoy me not being able to quickly ramp up from say 10 km/h to 40 km/h due the speed drag, most time by the moment i reach those higher speed, i'm already at the next stop sign or red light, so it becomes like a wasted effort.

no problems with starting up, BionX gives an amazing torque on starting up from 3km you can quickly jump to 30km no problem, is just the gap between 30km to 49km that seems weird.
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Old 06-05-09, 08:30 AM   #2
kbdog
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I'm a lot more sedate - 50 km/h is too rich for me! I did unlock the speed limiter but only because I hate being restricted. There's probably a work-around for the 50 km/h regen. Anyone?
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Old 06-18-09, 10:20 AM   #3
cerewa
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Quote:
BionX gives an amazing torque on starting up from 3km you can quickly jump to 30km no problem, is just the gap between 30km to 49km that seems weird
Two reasons it doesn't seem weird to me:
air drag tends to become very high at those speeds!
back EMF (this could be described as back-voltage) created by spinning the hub motor, makes it impossible for the motor to create much forward work at high speeds. Once the back-EMF/back voltage becomes higher than the battery voltage, you gain nothing from having a battery and in fact a significant amount of your forward energy can be lost just spinning electromagnets past permanent magnets, even though you're not charging up your battery.

(the magnets will create a current in the copper-coil electromagnets; that current will create some heat, the heat represents energy lost from forward motion).

Going 50kph would be easier with a motor that free-wheels when not in use, but no freewheeling motors WITH regenerative braking capability are available.
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