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3/12/2008 9:51:04 AM EDT
I need help taking the turning radius of a vehicle (24 feet) into the turning circle of the vehicle.

Does anyone know how to do this? I am sure it is pretty easy for the 60+% of ARFCOM with 130+ IQ's.

I took Geometry almost 20 years ago and got a D back then


"Curb-to-curb turning radius is the smallest radius the vehicle can turn without having the front wheels go over the curbs on either side of a street. Remember that it's the radius, not the diameter. Thus, a vehicle with a 25-foot curb-to-curb turning radius can turn around in a 50-foot-wide street without the front wheels going over the curbs.

Wall-to-wall turning radius is the smallest radius the vehicle can turn without the forward corners of the cab or the ends of the front bumper touching the walls on either side of an alley. The wall-to-wall turning radius is always greater than the curb-to-curb turning radius.

Of the two, the curb-to-curb turning radius is the most commonly used in sales literature because vehicles usually have to maneuver in open streets more often than in confined alleys. It's also the smaller, and therefore more impressive, figure to present to prospective buyers."
3/12/2008 9:51:50 AM EDT
[#1]
circumference =2*pi*r
3/12/2008 9:54:12 AM EDT
[#2]
Turning radius (inside rad) + Width of vehicle = Minimum turning circle radius.

Example:  24' turning radius (inside) + 5.5 feet (vehicle) = 29.5' total radius

Diameter is 59'

ETA:  usually the turning radius of a vehicle is actually measuring the diameter of the semi circle from inside tire to inside tire, so the radius itself will be 1/2 of 24'.
3/12/2008 9:54:17 AM EDT
[#3]
I suck at geometry.
3/12/2008 9:55:53 AM EDT
[#4]

Quoted:
circumference =2*pi*r


yep

actually it's c=2*pi*r(squared)
3/12/2008 9:57:46 AM EDT
[#5]

Quoted:

Quoted:
circumference =2*pi*r


yep

actually it's c=2*pi*r(squared)


NOT

Anything squared implies an area.  

kilgoretrout had it right.
3/12/2008 9:58:10 AM EDT
[#6]

Quoted:

Quoted:

Quoted:
circumference =2*pi*r


yep

actually it's c=2*pi*r(squared)


NOT


correct.  i was thinking area i think?
3/12/2008 9:59:01 AM EDT
[#7]
I like pi.
3/12/2008 10:01:14 AM EDT
[#8]

Quoted:
Turning radius (inside rad) + Width of vehicle = Minimum turning circle radius.

Example:  24' turning radius (inside) + 5.5 feet (vehicle) = 29.5' total radius

Diameter is 59'

ETA:  usually the turning radius of a vehicle is actually measuring the diameter of the semi circle from inside tire to inside tire, so the radius itself will be 1/2 of 24'.


Okay, the vehicle is 8ft wide- Econline 350- so I am looking at 64ft?
3/12/2008 10:01:25 AM EDT
[#9]
If it were a simple radius and circle,
2 pi r = (2)(3.14159)(24)

= 150 feet.  
3/12/2008 10:02:25 AM EDT
[#10]

Quoted:

Quoted:

Quoted:

Quoted:
circumference =2*pi*r


yep

actually it's c=2*pi*r(squared)


NOT


correct.  i was thinking area i think?

probably.

a = pi * r^2
3/12/2008 10:03:09 AM EDT
[#11]

Quoted:

Quoted:

Quoted:

Quoted:

Quoted:
circumference =2*pi*r


yep

actually it's c=2*pi*r(squared)


NOT


correct.  i was thinking area i think?

probably.

a = pi * r^2


oh man, i'm guessing my midterm yesterday didn't go too well!  
3/12/2008 10:03:37 AM EDT
[#12]
Wait...  are you looking for the circumference or the diameter of the circle?
3/12/2008 10:04:25 AM EDT
[#13]

Quoted:

Quoted:

Quoted:

Quoted:
circumference =2*pi*r


yep

actually it's c=2*pi*r(squared)


NOT


correct.  i was thinking area i think?


Area of a circle is pi*r^2. The derivative will give you  2*pi*r. Its the only way I can remember it.
3/12/2008 10:04:28 AM EDT
[#14]
Update:



Since the turning circle is actually a diameter, use the turning radius, plus two times the vehicle diameter.

ETA:  It depends on how the turning radius is figured.  It may already be defined as the outside (curb to curb) measurement.
3/12/2008 10:04:40 AM EDT
[#15]
Do you want the distance the vehicle drives to complete a circle (circumference) or the diameter of the circle that a vehicle could turn completely around in (diameter)?
3/12/2008 10:07:24 AM EDT
[#16]

Quoted:
Update:

www.unifac.com/altorfer/turnrad.jpg

Since the turning circle is actually a diameter, use the turning radius, plus two times the vehicle diameter.

ETA:  It depends on how the turning radius is figured.  It may already be defined as the outside (curb to curb) measurement.


Your circle has an asscrack.
3/12/2008 10:11:32 AM EDT
[#17]
oh man, i'm really glad i didn't take the online class.  i have enough trouble as it is!  
3/12/2008 10:23:21 AM EDT
[#18]
3/12/2008 10:25:23 AM EDT
[#19]

Quoted:
farm1.static.flickr.com/180/426622486_43d439d009.jpg?v=0


haha, oh man i'm really retarded, 'cause it took me a moment to get that!
3/12/2008 10:25:40 AM EDT
[#20]

Quoted:
I like pi.


+1000*
3/12/2008 10:26:41 AM EDT
[#21]

Quoted:
Do you want the distance the vehicle drives to complete a circle (circumference) or the diameter of the circle that a vehicle could turn completely around in (diameter)?


I need to know how large of a space I need to have for the vehicle to turn around in, without doing a 3 pt turn.
3/12/2008 10:33:28 AM EDT
[#22]
3/12/2008 10:34:40 AM EDT
[#23]

Quoted:

Quoted:
Do you want the distance the vehicle drives to complete a circle (circumference) or the diameter of the circle that a vehicle could turn completely around in (diameter)?


I need to know how large of a space I need to have for the vehicle to turn around in, without doing a 3 pt turn.


OK, that isn't the circumference.

All you need to do is add your vehicle's width to the turning radius, and multiply that number by two. (look at Torf's picture)
That's the minimum street width it will take for you to turn around in.

(24 + 8)*2 = 64 feet (like you and Torf already found)
3/12/2008 10:42:29 AM EDT
[#24]
,
3/12/2008 10:43:44 AM EDT
[#25]

Quoted:

Quoted:

Quoted:

Quoted:
Do you want the distance the vehicle drives to complete a circle (circumference) or the diameter of the circle that a vehicle could turn completely around in (diameter)?


I need to know how large of a space I need to have for the vehicle to turn around in, without doing a 3 pt turn.


OK, that isn't the circumference.

All you need to do is add your vehicle's width to the turning radius, and multiply that number by two. (look at Torf's picture)
That's the minimum street width it will take for you to turn around in.

(24 + 8)*2 = 64 feet (like you and Torf already found)


The only problem is that "turning radius" is not defined logically, as in, radius of a circle.

See Turning Radius.  If the vehicle has a 24' turning radius, than according to the metric, it can turn 180 degrees in a  24' space.

We would be correct IF the turning radius was the actual radius of the circle described by the inside corner of the vehicle.

I should have looked this up before posting.  Sorry.


No way in hell an F350 will do a 180 in 24 feet, unless he is laying black streaks on the ground.
3/12/2008 10:46:03 AM EDT
[#26]
Thanks guys.
3/12/2008 10:46:06 AM EDT
[#27]

Quoted:

No way in hell an F350 will do a 180 in 24 feet, unless he is laying black streaks on the ground.


I understand.  I screwed up.

I do believe that the turning radius DOES include the width of the vehicle though, so a 24' radius turns into a 48' turning circle,
3/12/2008 10:50:43 AM EDT
[#28]

Quoted:

Quoted:

Quoted:

Quoted:

Quoted:
Do you want the distance the vehicle drives to complete a circle (circumference) or the diameter of the circle that a vehicle could turn completely around in (diameter)?


I need to know how large of a space I need to have for the vehicle to turn around in, without doing a 3 pt turn.


OK, that isn't the circumference.

All you need to do is add your vehicle's width to the turning radius, and multiply that number by two. (look at Torf's picture)
That's the minimum street width it will take for you to turn around in.

(24 + 8)*2 = 64 feet (like you and Torf already found)


The only problem is that "turning radius" is not defined logically, as in, radius of a circle.

See Turning Radius.  If the vehicle has a 24' turning radius, than according to the metric, it can turn 180 degrees in a  24' space.

We would be correct IF the turning radius was the actual radius of the circle described by the inside corner of the vehicle.

I should have looked this up before posting.  Sorry.


No way in hell an F350 will do a 180 in 24 feet, unless he is laying black streaks on the ground.


The 24 feet was confirmed by a couple of sources on the web. But, I think that Ford uses that figure because it sounds better than turning cirlce. My '08 Tundra has a turning CIRCLE of 44ft. But that would mean the turning RADIUS is about 16 feet.
3/12/2008 10:50:44 AM EDT
[#29]

Quoted:

Quoted:
Do you want the distance the vehicle drives to complete a circle (circumference) or the diameter of the circle that a vehicle could turn completely around in (diameter)?


I need to know how large of a space I need to have for the vehicle to turn around in, without doing a 3 pt turn.


Well, if you do it right you can do it in a width that is slightly larger than the diagonal measurment of the vehicle.  You need some speed to do this: Lock up the rear brakes and give the steering wheel a hard sharp turn, then correct the skid at the right moment.  You will be facing the other way in about the same place in the roadway.  I don't recommed doing this on your driving exam, however.
3/12/2008 10:53:05 AM EDT
[#30]

Quoted:

Quoted:

Quoted:
Do you want the distance the vehicle drives to complete a circle (circumference) or the diameter of the circle that a vehicle could turn completely around in (diameter)?


I need to know how large of a space I need to have for the vehicle to turn around in, without doing a 3 pt turn.


Well, if you do it right you can do it in a width that is slightly larger than the diagonal measurement of the vehicle.  You need some speed to do this: Lock up the rear brakes and give the steering wheel a hard sharp turn, then correct the skid at the right moment.  You will be facing the other way in about the same place in the roadway.  I don't recommend doing this on your driving exam, however.


Somehow I do not think that will work in this situation, given that the vehicle is for a hospital shuttle service!
3/12/2008 10:53:59 AM EDT
[#31]

Quoted:

Quoted:

Quoted:

Quoted:
Do you want the distance the vehicle drives to complete a circle (circumference) or the diameter of the circle that a vehicle could turn completely around in (diameter)?


I need to know how large of a space I need to have for the vehicle to turn around in, without doing a 3 pt turn.


Well, if you do it right you can do it in a width that is slightly larger than the diagonal measurement of the vehicle.  You need some speed to do this: Lock up the rear brakes and give the steering wheel a hard sharp turn, then correct the skid at the right moment.  You will be facing the other way in about the same place in the roadway.  I don't recommend doing this on your driving exam, however.


Somehow I do not think that will work in this situation, given that the vehicle is for a hospital shuttle service!


"Buckle up sickies!"
3/12/2008 10:55:42 AM EDT
[#32]
You guys are freakin smart! i dont even remember anything from highschool
3/12/2008 10:58:32 AM EDT
[#33]
Wait, wait - doesn't it depend on who's driving?

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