Quote:
Originally Posted by aerohead
Vekke,the underside is covered in Hucho's section on diffusers.
The upsweep angle of the diffuser will depend on where the upsweep originates.
I believe that if before the rear axle,the angle can be as steep as 4-degrees.
If it starts after the rear axle,then 2.5-degrees is the limit.Please check Hucho's work to verify.
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The longer diffuser likes a shallower angle, the shorter diffuser likes a steeper angle (thus the reason I had to look at which actually reduced the tail area more). Shorter likes maybe 3.66 degrees the most, longer about 2.66 degrees. But as I said earlier, anything up to 6 deg (long) and 11 deg (short) is an improvement over 0 deg. These numbers may go further, but this is how far Hucho covers in his book.