Forum Discussion

Huntindog's avatar
Huntindog
Explorer
Sep 01, 2015

Math question

So after installing my new upgraded axles and springs, my WD needed a little tweak as the TT sits a tad higher.
While making the adjustment, I got to thinking...
It is often advised to error on the side of tounge low... My thought that I have never seen discussed here is that,, If it is tounge low, then the roof of the TT will act like a large spoiler creating downforce... I know it's not much of an angle (usually) but it is a very lage surface, and wind speeds can easily exceed 100MPH when towing into the wind.

So how much downforce would this add? Would it be enough to exceed the weight ratings of axles and tires? Especially since the industry tends to skimp on these components?

This could perhaps explain some failures that were unexplainable in the past.

Thoughts?
  • Ivylog wrote:
    It's not a math question it's an aerodynamics question. Not that a brick has much aerodynamics but the front of the roof will be in a low pressure area which will decrease the tongue weight and then the air hitting the back of the trailer's roof will take even more weight off of the tongue.
    I am sure that the answer can be figured mathmatically.
    I am also sure that it will impart downforce.

    Just try sticking your hand out the window on the highway at different angles to see what effect the wind has on it.
  • Ivylog's avatar
    Ivylog
    Explorer III
    It's not a math question it's an aerodynamics question. Not that a brick has much aerodynamics but the front of the roof will be in a low pressure area which will decrease the tongue weight and then the air hitting the back of the trailer's roof will take even more weight off of the tongue.

    *Have you ever seen the rubber roof of a trailer ballooning up in the front as it's going down the road from the air off the front of the trailer? Based on the answer below it is obvious you are not a pilot.