Sideways Tip/Roll Point?
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Mountain Pass
Joined: Dec 2017
Posts: 142
Likes: 23
From: Southeast Wisconsin
Sideways Tip/Roll Point?
This question is based entirely on curiosity. The FX4 model Super Duty has a gyroscope in it, so it nows the pitch and yaw angles. Basically, now tipped it is front-to-back and side-to-side.
At what point would the truck roll over sideways? Obviously there are lots of factors based on options, passengers, etc. Let's assume it's empty. Is there any actual data available? Are there any videos of one of these rolling while driving on the side of a hill?
At what point would the truck roll over sideways? Obviously there are lots of factors based on options, passengers, etc. Let's assume it's empty. Is there any actual data available? Are there any videos of one of these rolling while driving on the side of a hill?
Laughing Gas
Joined: Dec 2017
Posts: 1,077
Likes: 8
I think even the non-FX4 trucks have that screen. My plain jane XLT does. Not sure about the sidehill rollover angle but I know Paccar (parent company of Perterbilt, KW and others) has a tilt table at their R&D facility where they loosely strap the semis down and then experiment with different loads and see when they roll. Maybe the pickup makers have a similar setup but I don’t know how you’d go about finding the data. I’m not volunteering my truck to test it!
Cargo Master
Joined: Dec 2003
Posts: 2,182
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From: Saint Augustine, FL
If the truck is static (sitting still) it will roll over when leaning to one side far enough that the center of gravity is outside of the contact patch of the low side tires. The key here is knowing where the center of gravity is.
Laughing Gas
Joined: Dec 2017
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Freshman User
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Not sure on the 250 but when I went to Raptor Assault I was pretty impressed with the yaw capability.
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Posting Guru
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Ignoring width change due to tire deflection, it's just a geometry problem. If the truck is 80" wide and the cg is 40" high (just an example, I don't know the cg), it'll tip at 45*. If the cg was 30" high, it'd tip at 60*. You'd have to have some great traction to not slide sideways though.
It's a little more complicated for a dually, because the width isn't the same in the front in back. Suffice it to say, a F350 DRW can lean further than a SRW, and a F450 can lean even a little further than that (wider front).
Cargo Master
Joined: Sep 2012
Posts: 3,061
Likes: 39
From: Laramie, WY
I regularly pull off a road where that guage reads 8 degrees of side tilt, I get out of and back into the truck without any problems but it does seem like a fairly steep lean. No lift kit in a factory stock 2019 F250 Lariat FX4 gasser.
Hotshot
Joined: Apr 2013
Posts: 10,118
Likes: 650
From: NH
There are a lot of factors that complicate this from being a straight math problem. One is tire squish, one is suspension squish, and another is the amount of fuel you have. Wheelbase is probably another. Suffice to say that most drivers are incredibly uncomfortable and stop driving in sidehill situations long before there is any real threat to the vehicle tipping over.
Hotshot
Joined: Jun 2003
Posts: 12,338
Likes: 4,349
From: SW VA
At at least with the SD's aluminum body and beefier chassis now, the CG should be a little lower than previous gens (assuming the same height)