Bigfoot 10.4--where's the beef?

I verified the percentages.

137 * .56 = 76.72

So the COG is 76.72" from the rear jacks. (corrected per GoinThisAway)

You have the right number but the wrong reference, Kohldad. More weight is on the front jacks so the COG will be closer to them. 60.3" back from the front jacks or 76.7" forward from the back jacks.

Nice camper you have there, Marcela :B

Hate to say it, but she is right.

60.3 from front jack makes it a foot behind rear axle on most of the trucks.
Estimating the truck wheelbase, the camper will take about 300 lb from front axle.
And the COG thread just got closed :D

Wrong formula...Percentage of weight on jacks has nothing to do with COG, because it totally disregards the lever affect of the cab-over overhang...

To arrive at COG, one first has to convert distance from the front cab-over overhang into moments, as follows:

1) Weight on front jacks x distance from the extended front overhang edge (to arrive at first moment).

2) Weight on rear jacks x distance from the extended front overhang edge (to arrive at second moment).

3) Add first and second moments together to arrive at total moments.

4) Now divide total moments by gross weight to arrive at COG, this the distance from front overhang edge reference point.

Of course this will change a bit when tanks and LPG, etc are full...

In OP’s example as follows assuming cabover overhang distance is say 80” from center of front jack and say 203” estimate from overhang to center of rear jack (abstract guesstimates only based on BF 10-4 model number)...

1) 2057 x 80” (estimated) = 164,560 moments

2) 1617 x 203” (estimated) = 328,251 moments

3) Total moments = 492,811

4) Divided total moments by total weight of 3,674 = COG 134.13” from front overhang edge (reference point)...

This can also be done with the camper on the truck (though yielding a different COG) using the front bumper edge as a reference point and measuring to the center of each axle...

3 tons

3 Ton thats how we did it in the USAF for vehicles going on A/C. W1 X D1 + W2 X D2 diveded by GVW. We called in Center of Balance.

I did a big writeup on this and for some reason it was squashed.

Marcela wrote:
I did a big writeup on this and for some reason it was squashed.

I looked in the deleted threads for this and didn't see anything. Can you tell me about when it was squashed and I'll repost the salient points.

Bigfoot placed a COG sticker 57” back from front bump stops on our 10.4. That falls directly over rear axle on our truck. X-2 on the nice camper!

jplante4 wrote:

Marcela wrote:
I did a big writeup on this and for some reason it was squashed.

I looked in the deleted threads for this and didn't see anything. Can you tell me about when it was squashed and I'll repost the salient points.

It would be just prior to my comment. Appreciate it. Don't think I can duplicate it but might try again if you can't come up with anything.