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Old 08-02-2009, 09:36 PM   #21 (permalink)
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I won't have brake rotors, so that's not an issue. I'll be downsizing my hub motors, but I don't believe that to be an issue either, as my estimated 65mph cruise will be 10KW. Acceleration can be dealt with through water cooling.
What if your batteries are full and you *need to stop*?

No, you'll want the braking system to be able to generate 1000 HP or so, and you'll want it to be operable even if driveshafts break, electrics fail, and you lose power from the motor(s).

And wait a minute, you're going to water cool four hub motors? Two flexible coolant lines to each wheel, a water pump, an unaerodynamic radiator, umpteen gallons of coolant at 8lbs/gal...

There are very sound engineering reasons why most of the electrics on the road are tiny, low-performance machines. Start small.

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Old 08-03-2009, 03:40 AM   #22 (permalink)
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What if your batteries are full and you *need to stop*?

No, you'll want the braking system to be able to generate 1000 HP or so, and you'll want it to be operable even if driveshafts break, electrics fail, and you lose power from the motor(s).

And wait a minute, you're going to water cool four hub motors? Two flexible coolant lines to each wheel, a water pump, an unaerodynamic radiator, umpteen gallons of coolant at 8lbs/gal...

There are very sound engineering reasons why most of the electrics on the road are tiny, low-performance machines. Start small.
The motors generate electricity, so even if the batteries fail, you still have electricity. I anticipate a failsafe which electrically jams all 4 motors. It wouldn't be a desirable stop, but it would stop pretty quick.

You can move just as much heat by moving half the coolant at twice the speed, and the radiator does not need to be either huge or constantly exposed.
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Old 08-03-2009, 03:57 AM   #23 (permalink)
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Where are you getting your information?
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Old 08-03-2009, 07:18 PM   #24 (permalink)
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I don't normally agree with frank, he has a good point, your facts seem to be based on alot of wishful thinking, for one coolant does not cool twice as fast if you move twice as much past it, this is why low speed pumps are popular for solar hot water systems, because the systems work best if you get as much heat out of the fluid as possible before putting it back to get heated, high flow pumps lead to over heating, also where are these motors that you are talking about using? or are you going to hand build them?
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Old 08-04-2009, 01:16 AM   #25 (permalink)
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Hey! Waddya mean ya don't normally agree with me?!?

Don't you know I'm right 99% of the time?
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Old 08-04-2009, 01:24 AM   #26 (permalink)
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also where are these motors that you are talking about using? or are you going to hand build them?
One doesn't NEED to buy off the shelf components... It's just cheaper and easier.

Although it has been watered down in recent years, custom did mean at one time that something was made as a one-off for a single project.
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Old 08-05-2009, 10:44 PM   #27 (permalink)
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Skirt these in and he's golden!

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Old 08-06-2009, 02:42 AM   #28 (permalink)
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Skirt these in and he's golden!

See, now that's what I'm talking about. Can I get a tire for a 4" wheel, that preferably will handle 200 mph?
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Old 08-06-2009, 10:31 AM   #29 (permalink)
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Sound like you're after some sort of aircraft wheel!

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