Ron Gratz wrote:
Gdetrailer wrote:
If you look closely you will notice that the axles are 2/3 the way back from the front (IE tongue)..
If you place 100 lbs on the rear bumper your will remove 1/3 of that weight from the tongue or roughly about 33 lbs..
In the example I used, the distance from ball to added load was 28.5' and distance from ball to axles' midpoint was 17.8'.
That puts the axles' midpoint at 17.8/28.5 = 62% of overall length.
If the TT had a single axle at 17.8',
100# added at the rear would cause about 100*0.38/0.62 = 61# to be removed at the ball.
In your example where "the axles are 2/3 the way back from the front" (and if the trailer is single axle),
100# added at the rear would cause about 100*0.333/0.666 = 50# to be removed at the ball.
In order to remove a load of 33#, the axles would have to be 3/4 of the way back -- not 2/3.
Ron
Well Ron, I have very bad news for you..
I have PERSONALLY weighed the tongue weigh difference using my 26ft dual axle TT and the result IS what I have mentioned above.
for 100 lbs my tongue LOST 33 lbs..
I also tested 200 lbs and the result was pretty darn close to 66 lbs..
Typically your axles ARE at 1/3 from the back and two thirds from the front in order to get proper 10%-15% tongue weight balance.
The dual axle tends to foul up calculations since the center is between the two axles and your axles do shift front to back a bit..
In other words measurements are a bit dynamic even when sitting still..
Additionally COG can affect the tongue weight which is an often overlooked item.. COG will shift some weight to the tongue if tongue is lower than level and if above level it is shifted towards the back..
