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Unread 08-10-2009, 07:20 AM   #51
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Default Re: 1996 CC build thread

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Originally Posted by BlackHornet View Post
i believe so. i was just answering the question that i read. also, i was on my phone so it doesnt show as much as my computer does. as well as you could be building a cart for all that i know and then i wouldnt know what kind of specs you were going to have, andddddd you didnt say that you were wanting a way to find out the RPMs on your cart.....all you asked was how i knew the RPMs of my cart
OK, I over reacted to what I thought a smarta$$ reply. Sorry. I've never done texting and do not know the limitations.

I suppose there is no way to know how many turns a D & D motor is making. It's not that important, but would be interesting. I have stock gearing. Would my motor be turning the same as your AC motor at 27 mph? If so, I could interpolate the rest.
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Unread 08-10-2009, 07:58 AM   #52
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Default Re: 1996 CC build thread

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Originally Posted by pjshane View Post
OK, I over reacted to what I thought a smarta$$ reply. Sorry. I've never done texting and do not know the limitations.

I suppose there is no way to know how many turns a D & D motor is making. It's not that important, but would be interesting. I have stock gearing. Would my motor be turning the same as your AC motor at 27 mph? If so, I could interpolate the rest.
psjhane,

More than likely not. B/H AC motor turns 6,800 rpm. Check your motor & see what the rpm's are.

Now. If you’re motor can turn 6,800 rpm’s. B/H & you had the same rear gear & the same rear tire height, and then your answer would be yes. Hope this helps.
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Unread 08-10-2009, 08:34 AM   #53
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Default Re: 1996 CC build thread

Based on the information in your signature, assuming the tires are 18.5" diameter and stock 12.44:1 gears, the motor would have to turn 7250 rpm to reach 32 mph. Hope this helps.
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Unread 08-10-2009, 08:39 AM   #54
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Default Re: 1996 CC build thread

its ok pjshane, you have to love talking online....you cant hear tones and so sometimes things get interpreted wrong. what are some of the other specs on your motor?
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Unread 08-10-2009, 09:01 AM   #55
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Default Re: 1996 CC build thread

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Based on the information in your signature, assuming the tires are 18.5" diameter and stock 12.44:1 gears, the motor would have to turn 7250 rpm to reach 32 mph. Hope this helps.
Yeah, the 12.44:1 ratio really helps. I'll use a tape measure to find the circumference of the rear tires and go from there. Easier yet, I'll put a mark on the tire and floor and see the distance from one revolution. I had forgotten that I am not using stock rear wheels. I had no idea the motor would be turning that fast. No wonder it could fly apart if not controlled by a load.
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Unread 08-10-2009, 09:05 AM   #56
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Default Re: 1996 CC build thread

at 32mph mine hits like 7500 rpm....i let off haha
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Unread 08-10-2009, 09:41 AM   #57
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Default Re: 1996 CC build thread

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at 32mph mine hits like 7500 rpm....i let off haha
Are you still talking about your AC motor?

What hand held programmer do you have?
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Unread 08-10-2009, 11:07 AM   #58
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Default Re: 1996 CC build thread

One revolution of my rear tire spans 56"

At a gear ratio of 12:44:1 (56" / 12.44) equals 4.5 revs per inch

There are 63,360 inches in a mile (12 X 5,280) which would equal 14,080 revs per mile (63,360 / 4.5)

It will take 380,160 revs for 27 miles (14,080 X 27)

If those 380,160 revs are done over an hour, that would be 6,336 rpm (380,160 / 60 minutes)

6,336 rpm sounds about right comparing with BlackHornet's measurement. Small rounding errors were ignored.

Working backwards now, if I cut the 6,336 rpm by 27 mph, I get 235 rpm for 1 mph and can do the math for any other speed.

I know you guys are going to double check my math and some of you will come up with a more elegant way of expressing the formula.
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Unread 08-10-2009, 12:40 PM   #59
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Default Re: 1996 CC build thread

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Are you still talking about your AC motor?

What hand held programmer do you have?
ya. i dont have the programmer.. PM me and lets get something goin haha
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Unread 08-12-2009, 08:51 PM   #60
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Default Re: 1996 CC build thread

BH you need to clear out & make some space in your Private Messages.
So are you thru with the build yet? You ready to turn it into a drag racing cart yet. Let's do it.
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