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 ...
Forum Discussion
Huntindog wrote:For virtually all TT front-end shapes, there will be a negative pressure resulting from air flow over the front of the roof.
---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?
If the roof is sloping downward at the front, the magnitude of the negative pressure will be decreased by about three percent per degree of slope.
If a TT is "nose down" by two inches and the distance from the coupler to the midpoint between axles is 200", the downward slope would be about 0.5 degrees.
The resulting reduction in the magnitude of the negative roof pressure would be about 1.5%.
IMO, the effect on axle and tire loading, due to roof pressure changes, would be negligible.
Ron
