Formula Hybrid - DIY Electric Car Forums

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#1
05-15-2012, 10:10 AM
 kishor5466 Member Join Date: May 2012 Posts: 43
Formula Hybrid

hey guys ,
for a car to accelerate and complete a distance of 200 under 6 to 8 seconds what type of motor can be used and tuned easily???

#2
05-15-2012, 10:51 AM
 frodus Senior Member Join Date: Apr 2008 Location: Portland, OR Posts: 3,769
Re: Formula Hybrid

200 what? feet? meters?
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Travis Gintz
Electro Motive Force, LLC.
#3
05-15-2012, 04:39 PM
 kishor5466 Member Join Date: May 2012 Posts: 43
Re: Formula Hybrid

Is it possible to achieve 200 meters under 10 seconds with any electric motor ???(If your car weighs around > 300kg approximately according to calculations)
#4
05-15-2012, 04:57 PM
 frodus Senior Member Join Date: Apr 2008 Location: Portland, OR Posts: 3,769
Re: Formula Hybrid

Do the calculations. Calculate the torque and power needed to accelerate a 300kg vehicle 200meters. Then come back and ask me if there's a motor that has that torque and power.

I can tell you YES, there is a motor that can do it, but it only races at 1/4mile at a time and does so in just under 7 seconds and goes 200mph.

If you need something for a longer race, things get more complicated. Cooling the motor becomes a huge issue.
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Travis Gintz
Electro Motive Force, LLC.
#5
05-16-2012, 06:29 AM
 Yabert Senior Member Join Date: Feb 2010 Location: Québec, Canada Posts: 1,431
Re: Formula Hybrid

Quote:
 Originally Posted by kishor5466 Is it possible to achieve 200 meters under 10 seconds with any electric motor ???(If your car weighs around > 300kg approximately according to calculations)

Yes... some electric Jr dragster on this site doing 1/8 miles under 10 seconds.
But under 6 sec will be a good challenge (imply a really good power to weigh ratio).
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#6
05-16-2012, 06:40 AM
 Tesseract Senior Member Join Date: Sep 2008 Location: Tampa, FL USA Posts: 3,199
Re: Formula Hybrid

Quote:
 Originally Posted by kishor5466 Is it possible to achieve 200 meters under 10 seconds with any electric motor ???(If your car weighs around > 300kg approximately according to calculations)
I'm replying here because I received a PM from you in which you asked me to solve your design problems. I don't mind helping people out but I'm not here to do anyone's homework!

If you are an engineering student then you ought to be able to figure out how to answer the above questions. First you need to determine the rate of acceleration given a distance and time, which which then also give you a final velocity. Next you need to figure out the amount of power required for the given mass and calculated velocity and acceleration rate.

After you've done all that you can then come here and ask for motor and controller recommendations. I can tell you right now that what you want to do is fairly simple and could easily be accomplished with low-end golf cart components.
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#7
05-16-2012, 08:45 AM
 kishor5466 Member Join Date: May 2012 Posts: 43
Re: Formula Hybrid

I have done the calculations before and the calculations are like this..........
m=400kg
t=8s
distance to be covered is 200m
since the initial velocity is 0 the acceleration will be 6.25m/s^2
hence final velocity will be 50m/s
so the output required will be 400*50*6.25=125kw
which is so huge?? Am i wrong in calculations?? or is the parameters taken are wrong??
or is it not possible to get the required outputs???
#8
05-16-2012, 09:54 AM
 Tesseract Senior Member Join Date: Sep 2008 Location: Tampa, FL USA Posts: 3,199
Re: Formula Hybrid

Quote:
 Originally Posted by kishor5466 I have done the calculations before and the calculations are like this.......... m=400kg t=8s distance to be covered is 200m
You said 300kg and 10 seconds to go 200m. That's quite a bit different from 400kg and 8 seconds... So which is it?

EDIT: 48kW for 300kg/10s/200m vs. 125kW for 400kg/8s/200m - that's the difference between only needing golf cart components or having to use mid-high level EV components.
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Last edited by Tesseract; 05-16-2012 at 10:02 AM. Reason: Added bit
#9
05-16-2012, 10:10 AM
 kishor5466 Member Join Date: May 2012 Posts: 43
Re: Formula Hybrid

Yeah ....... so my calculations are correct ........... so i need the one for 400/8/200
#10
05-16-2012, 10:16 AM
 iti_uk Senior Member Join Date: Oct 2011 Posts: 168
Re: Formula Hybrid

Quote:
 Originally Posted by kishor5466 I have done the calculations before and the calculations are like this.......... m=400kg t=8s distance to be covered is 200m since the initial velocity is 0 the acceleration will be 6.25m/s^2 hence final velocity will be 50m/s so the output required will be 400*50*6.25=125kw which is so huge?? Am i wrong in calculations?? or is the parameters taken are wrong?? or is it not possible to get the required outputs???
300kg and 10s would give an answer of;
(a = 4m.s^-2)
(V = 40m/s)

48kW

Less than half of your last number.

Which target are you trying to hit?

edit: lol too slow

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