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Old 11-13-2013, 10:17 PM   #11
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Quote:
Originally Posted by TAfraser View Post
Front axle of truck on scale (trailer connected); 2420#
Both axles of truck on scale (trailer connected); 5360#
Truck and trailer on scale; 8560#
Trailer only on scale (connected to truck); 3360#
That seems reasonably consistent...

If the "Truck and trailer on scale" is all of the axles, then the whole rig weighed 8560 pounds. The "Trailer only on scale" weight is the portion carried on the trailer axles (3360 pounds); however, the 8560 lb total minus the 5360 lb on the truck axles leaves 3200 lb on the trailer axle.

The difference (160 lb) seems like a lot, but combining multiple scale readings accumulates the errors in the readings... something to keep in mind in these exercises.

What the 3200 pound to 3360 pound value means about axle weight depends on the answer to the question I posted above about the WD system.
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Old 11-13-2013, 10:25 PM   #12
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My truck normally weighs 4900#, but I can't be sure of it's weight without the trailer on that day. So if I'm doing this right, the calculated tongue weight is (Truck's both axles on scale - assumed truck weight ) or 460#.
That looks right to me... but it's only truly the tongue weight if the WD system was not applying any force at all.

Quote:
Originally Posted by TAfraser View Post
Add to that the trailer only weight from the scale of 3360# and we get a total of 3820#.
That's valid regardless of what the WD is doing.

Or more directly, 8560 pounds complete minus 4900 pounds of truck is 3660 pounds. Hmmm... that's not quite the same as 3820 pounds. The scale errors are maddening, aren't they?
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Old 11-13-2013, 10:32 PM   #13
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... 380#
Filled the fresh water tank = 340#
Emptied fresh water tank = 380#
...
Hope this helps in some way.
Well, that alone means that a couple hundred pounds of water added to the tank reduced the tongue weight by about 1/5th of water weight. That means the tank is centred behind the effective axle position (midway between the wheel centres) by about 1/5th of the distance from axle to coupler... and the effect of any change in freshwater load can easily be calculated. That's helpful.
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Old 11-13-2013, 10:51 PM   #14
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Originally Posted by TAfraser View Post
OK, so here goes. I'm not totally secure with all this, but I'll give you what I have"..............

At the end of this sequence, I ran out of daylight.
Coming from a metrology lab, I'm not nearly done testing. The Sherline scale has enough abnormalities that I question it's accuracy (even though this is the second one they've sent me).

Hope this helps in some way.
Thanks Tom!
Can't wait til I can make scale runs of my own
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Old 11-14-2013, 12:05 AM   #15
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TAfraser, I don't know what you are questioning on the Sherline. Looks good to me.
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Old 11-14-2013, 12:23 AM   #16
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After replacing the gauge on mine, I'm hoping to test it against other Sherlines at the Escape Rally to make sure I didn't mess up.
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Old 11-14-2013, 01:17 AM   #17
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Escape 21 weights

The Anderson was installed, but the chains were not tightened for the measurements I gave. I did run it over the scale twice with the chains set two different ways, but the weight measurements went a different way then what I expected. Reace didn't think they made sense either. I hope to make more runs on the scales, without wearing out my welcome. One other thing, I put my weight on and off the scale and it read correct both ways.

The comment about the fresh water tank placement is right on. It is located between the axles and extends towards the rear. Good call!!

The reason I question the Sherline's accuracy is the following: I put the trailer tongue weight on the scale and received an indication of 380#. I then placed about 200 more pounds on the tongue and it indicated 580#. I then removed the 200# and the scale only returned to about 500#. If I do it again, but only use 100#, the Sherline doesn't return at all. I also received two different measurements depending on weather or not I lowered the trailer tongue onto the scale (only by 2") or raised the scale to the tongue with my hydraulic floor jack. Both methods are recommended in the Sherline directions. The difference was over 100#. In my old line of work, (Metrology) this scale would have been either rejected, or qualified as only being accurate in one direction, using one method. This phenomenon happened using two different, brand new Sherline scales.
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Old 11-14-2013, 08:27 AM   #18
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weight of a 21

The Jeep weighs 5300# with 2 pax, When it had the equipment inside the jeep it was about 5800#, we then transferred the traveling equipment (we are travelers, not campers) into the trailer, Jeep was then about 5300#. With the Anderson hitch connected and adjusted to go down the road we weighed the Jeep at 6000# and the 4 trailer wheels at 3600#. 1800# each side. Then with 1/2 fresh water and some grey plus a couple gallons of black the sherline scale read 550# with no WDH installed and all of our stuff still inside. I consider the weight as we were going down the road as total about 4200# plus the weight of the hitch. After dumping all tanks and removing our food and clothing the tongue weight was the 350 number. The sherline reading seemed to vary with level and chocking.
I hope this makes sense and answers any questions. I do like the positions of the tanks on the 21.
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Old 11-14-2013, 09:56 AM   #19
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Weight of 21

I've got a very basic question to ask. I should already know this, but here goes. With my trailer weighing in at 3360# when connected to the truck, am I only pulling that weight, and carrying the tongue weight , for calculation purposes? I know with this setup, on this day, the axles were only carrying 3360# - without the WDH - and the truck was carrying the rest, but what was I towing, again, for calculation purposes?

And for another question. I said that I couldn't understand the weights using the Anderson, maybe one of you will. Using the WDH, adjusted wrong, with the trailer only on the scale, the trailer weight went down by as much as 200 lbs to around 3160#. I thought that transferring weight off the tongue would put weight on the truck's front axle and the trailer's axles. The trucks front axle weight did go up by 40 lbs. While the trailer was on the scale, I loosened the chains (just checking) while watching the scale weight, and the weight of the trailer went up. The truck weight, including tongue weight, also went down. So what I saw was both the trailer and truck individual weights going down, while the front axle weight went up. The only thing that remained constant was the total weight of truck and trailer. So where did that weight go to? I need to spend more time, not rushed, with that scale.
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Old 11-14-2013, 12:01 PM   #20
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I'll let Brian handle that one...
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