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Open Roads Forum  >  Fifth-Wheels

 > How to calculate turn radius of fifth wheel for new driveway

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howardwheeler

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Posted: 07/15/18 09:05pm Link  |  Quote  |  Print  |  Notify Moderator

I am putting in a new drive so that I can pull out my 37 foot Alpenlite rather than having to back it out (I know that’s extremely lazy but I have the opportunity because we must put in a completely new drive anyway and want to take advantage of it). Because of trees it would be nice to know what the sharpest turn can be knowing that the trailer will track inside the truck’s track. I will make the drive wider at the point of the turn to accommodate the trailer tracking inside the truck path, but since you pay for additional materials, it would be nice to figure out the minimum needed. I would take my trailer out in a parking lot and simply do some trial runs but I can’t move it before my friends will be here with the equipment to put in my main drive. I thought some here might have some formula for radius’s and how to determine how far inside the trailer will track from the truck. Thanks

SAR Tracker

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Posted: 07/15/18 09:48pm Link  |  Quote  |  Print  |  Notify Moderator

Go to a big parking lot in the middle of the night, and measure it.


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Mandalay Parr

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Posted: 07/15/18 10:17pm Link  |  Quote  |  Print  |  Notify Moderator

I’m an engineer and not aware of any such formula.


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howardwheeler

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Posted: 07/15/18 11:27pm Link  |  Quote  |  Print  |  Notify Moderator

I’m also concerned about how the tail swings out, but I guess I’m going to have to just guesstimate.

tippytoe

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Posted: 07/16/18 12:46am Link  |  Quote  |  Print  |  Notify Moderator

This might help: https://truckscience.com/turning-circle-calculator/?gclid=EAIaIQobChMIn8jTmIKj3AIVA8-yCh2yPgI8EAMYASAAEgJNnfD_BwE

bucky

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Posted: 07/16/18 03:53am Link  |  Quote  |  Print  |  Notify Moderator

click here for link
tippytoe wrote:

This might help: https://truckscience.com/turning-circle-calculator/?gclid=EAIaIQobChMIn8jTmIKj3AIVA8-yCh2yPgI8EAMYASAAEgJNnfD_BwE



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hammer55

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Posted: 07/16/18 05:17am Link  |  Quote  |  Print  |  Notify Moderator

or look on you tube and put in trailer tracking

ford truck guy

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Posted: 07/16/18 05:51am Link  |  Quote  |  Print  |  Notify Moderator

howardwheeler wrote:

I’m also concerned about how the tail swings out, but I guess I’m going to have to just guesstimate.


You will need to watch that...

I was going camping for the weekend and had stopped at the travel plaza on the PA Pike for a break. When walking back to my rig, there was a couple driving the wrong way with a NEW rig trying to find a parking spot between the trucks, he was hugging the barrier. I knew what he was doing, so I started jogging ( as best as this fat ARSE could ) to get to him but was too late.... He cut a hard left turn and scrapped the rear curb side of the trailer , tore the corner edge off and the bumper....

Know your swings ! ! ! !


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valhalla360

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Posted: 07/16/18 05:59am Link  |  Quote  |  Print  |  Notify Moderator

Mandalay Parr wrote:

I’m an engineer and not aware of any such formula.


I'm a traffic engineer and yes we have software (autoturn) to do this but not convenient for a layperson to obtain. You could go to a local engineering firm but it likely doesn't make financial sense unless it's a buddy who will run it for you.

If you google "turning templates", you can pull up pre-made ones for various design vehicles that will give you a good idea of what to consider but we don't normally design for RV's (to many variations).

The idea to find an empty parking lot and then simulate the turn while marking it out is a good option. Make sure to add a little extra width as you won't hit the curve exactly down to the nearest inch every time. The outside sweep of the rear overhang doesn't need to be paved, just clear of trees and other obstructions.

One complication to consider: Is it a simple single turn? Or do you have to turn left off the road and then almost immediately turn right? If, yes, when you go out to the parking lot, make sure to simulate the entrance and exit maneuvers.


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4x4ord

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Posted: 07/16/18 06:02am Link  |  Quote  |  Print  |  Notify Moderator

Your best option is definitely to follow SAR Tracker's advice and measure it out in a big parking lot. I would think you should be able to turn it around inside a 55 foot circle.


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