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CENTER OF GRAVITY

548 Views 3 Replies 4 Participants Last post by  m37charlie
I have not found the weight of the Square Cab (Cab only), nor a COG diagram for just the cab, but the Builder's Book offers this information for those that might be interested.

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I have not found the weight of the Square Cab (Cab only), nor a COG diagram for just the cab, but the Builder's Book offers this information for those that might be interested.

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1988 U1300L RW1 Working gears Dual Tanks AC Rigged for Camping Plus: 91 F250 HD 4x4
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With all the numbers available for these trucks, it is frustrating when something I think should be so available really isn't.

The location of the CG of the cab alone is relevant to the tilt, as it appears that it can end up FORWARD of the pivot pins at FTB, hence the restraining strap to prevent the cab from doing a somersault.

The point here is, that is another factor that would overload the pin attachment to the body, although that loading is more aligned with the long axis of the "beam", and the bottom flange of the C section would be better able to resist the attendant compression load. The overload is from a strap that pulls both back and down, to the frame; that extra "pull down" is applied to and resisted by the front pins.

Also, especially for the DOKA's, the relation of the cab CG to the lift and pivot points would tell all re: forces on those points.

Lee
 

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With all the numbers available for these trucks, it is frustrating when something I think should be so available really isn't.

The location of the CG of the cab alone is relevant to the tilt, as it appears that it can end up FORWARD of the pivot pins at FTB, hence the restraining strap to prevent the cab from doing a somersault.

The point here is, that is another factor that would overload the pin attachment to the body, although that loading is more aligned with the long axis of the "beam", and the bottom flange of the C section would be better able to resist the attendant compression load. The overload is from a strap that pulls both back and down, to the frame; that extra "pull down" is applied to and resisted by the front pins.

Also, especially for the DOKA's, the relation of the cab CG to the lift and pivot points would tell all re: forces on those points.

Lee
Well then, that's easy, the center of gravity is JUST past the distance of the retaining strap is it not? ;) (jk)
 
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