texas-5-ton

I can't logically figure this one out so I need some help from the gurus. As many of you know, our FD has purchased this M813 for a brush truck. Our water tanks are two, 600 gallon military fuel pods that are designed for these 5 tons (or M35's). So combined, you have 1,200 gallons of water on the truck. What I am trying to figure out is how much can the truck lean (in degrees) to either side before being in danger of turning over (full of water). I did a search but can't come up with anything. My concern is that since this thing will have a high center of gravity that it will be quite susceptible to turning over on the fire ground. If I can figure out (with your help) how to calculate this, I plan on putting a "Lev-O-Guage" in the cab to help warn us of such a condition. (Although I hope that pucker factor will prevent this from ever happening). Thanks for the help..

Towman2277

I do high risk recoveries and can calculate this for you with some software that I have in the office. First i'll need a few pics of the tanks to show placement and shape, and some measurements. I'll need your tire width across the rear (width of rearend with tires, measured to outside edge.) and i'll need a measurement of how high your tank bottom and centerline are measured from the ground up. If you can get these and email to steveyoungtowing@bellsouth.net I can get you a very accurate angle measured in degrees.

texas-5-ton

Steve,
Bless you brother!! I will get this for you as quickly as possible. The truck and tanks are out of town right now but I should have it back later this week. Thanks again. I REALLY APPRECIATE IT !!

Chad

Towman2277

Just let me know. When we have a rollover situatation we respond to (ie. Gasoline Tanker, etc) we correspond back to the office with different weights, measurements, hill angles, obstacles, etc and we can be given a VERY ACCURATE chart that says exactly when we will reach the positive 1 position (in degrees), Nuetral balance position (about to roll), and negative 1 position etc, ( she's rolling, MOVE). It's really cool software. I'll keep and eye out to get all the info from you. Steve

texas-5-ton

YOU THE MAN !! This is exactly what I was looking for. I owe you one !!

Chad

M1075

Chad-

If you find the side slope capability too limiting, you might want to try mounting the tanks on the frame instead of in the bed. That moves the weight down a lot lower. I have seen several M818s mounted that way. Keep in mind that rollover potential is impacted greatly by tanks with partial loads. Good luck with the project.

emmado22

the 600 gallon pods are RARELY baffled. No baffles = much higher risk for live load shift=easier to roll over..

cranetruck

Check out article in issue 87 (Oct 2001) of MVM.
The biggest problem would be sloshing like Emmado points out. The military calls for 1/2 the load for off road.

The inclinometer can be purchases from Westmarine.com, about $20.

Attached Images

	inclinometer_189.jpg (137.4 KB, 1664 views)
	side_slopes_2_437.jpg (173.1 KB, 1663 views)
	side_slopes_1_772.jpg (74.3 KB, 1662 views)

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Bjorn

MEP-018A (needs new generator head)

Avatar: XM757 in OK prepared for 1,000 mile trip home. Part of 6,000 mile journey in 2006.
1968 M49A2C modified with 1960 M756A2 truck bed and 1975 HIAB 765A knuckleboom, exhaust brake, VIC-1 and more.
1969 Ford XM757 8x8, 5-ton Pershing 1A truck tractor...the "improved MV".

"Some things can't be made better, just differently......a lot of things actually"

DDoyle

Bjorn,
Do your calculations not also assume the conversion from 9.00-20 to 11.00-20, in addition to singling the tires out?
I dunno of the original poster has single or duals - or their sizes - on his five ton.

Regards,
David

jasonjc

As far as the half load I'm not shure about the "pods".But in the tanker trucks the TM says to fill the front tank only for the 1/2 load.Not 1/2 in ea tank.

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