MPG = Air Resistance vs Speed vs Weight
Improving MPG had me wondering, so I found a definitive calculator to make the math easier. http://ecomodder.com/forum/tool-aero-rolling-resistance.php Vehicle weight [1]: 10,000lb (TV & TT) Crr ...
Forum Discussion
SplinterFL wrote:hddecker wrote:
TT 11.5K#s, TV Ram 6.7L Cummins, TT 11.5' high towing at 65MPH over 18K miles, Fuel mileage, 11.75 MPG.
The formula is conservitve, you should have a aerodyanic trailer. A semi is a flat wall (.6), and a 5th wheel has some curves (.5 or even .4).. so it's not perfect unless you put it in a wind-tunnel to know your true drag.
11.5' did you remove 1 foot for road-clearance.
10.5' * 7 wide= ~75ft
Diesel=.3 eff or perhaps .4 with a turbo charger
Lets say your tt has some good curves, 0.4 drag
11.5k lbs weight, with .4 drag
@65 MPH = 10.95 MPG (.3 engine) / 14.6 MPG (.4 engine)
You'll have to tweak the numbers until it fits your rigs MPG, then change your weight and see how little it changes.
Nope, it's like a great big brick, absolutely no aero to it at all. The front wall is almost straight up, might be 2-3 degrees off vertical.
Doesn't the fact that the TT is up in the air actually increase drag. Seems to me that the NASCAR engineers work as had as they can to stop the air from getting under the car and create drag. A lot more semi trailers a being equipped with the side skirts, must have some thing to do with stopping aero drag.
