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 ...
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The roofs are so "dirty" with AC's, vents, shower domes, antennas, etc. The slight angle of attack you are getting, and the fairly low airspeed don't amount to much. You are looking at about 0.0807 lbs. per cubic foot of air at standard temperature and pressure. Assuming the trailer is 8.5 feet wide, 4 inches higher at the rear then front, and you have 100 mph wind over the top. That's 528,000 linear feet per hour (3600 seconds), or 146.667 linear feet per second. 8.5 feet across times 4 inches tall is 2.831 feet of displacement * 146.667 linear feet per second. So you are vertically displacing 145.141 cubic feet per second total, or about 33.5 lbs of air per second. The axles are over 50% of the way back, so over 50% of that occurs in front of the axles, and in theory is added to the TV.
The reality is there is a huge low pressure at the front, far larger then the slope of the trailer, random high and low pressure spots above and below the trailer down it's length, and an 8.5 by 10 foot box (tv and trailer)is shoving 12466 cubic feet of air out of the way, and dragging it back behind it - per second (at 100 mph air speed). The 1000+ lbs of air you are pumping at each end per second has far more to do with anything then the 30 something the roof is moving.
The reality is there is a huge low pressure at the front, far larger then the slope of the trailer, random high and low pressure spots above and below the trailer down it's length, and an 8.5 by 10 foot box (tv and trailer)is shoving 12466 cubic feet of air out of the way, and dragging it back behind it - per second (at 100 mph air speed). The 1000+ lbs of air you are pumping at each end per second has far more to do with anything then the 30 something the roof is moving.
