cutting holes in your rear bumper

[MadisonMPG]

Inb4 all this BS again that happened with Hermie.

[thatguitarguy]

That does it. I'm gettin' on the hatewagon.

[MadisonMPG]

Originally Posted by thatguitarguy

That does it. I'm gettin' on the hatewagon.

How much are tickets?

[Sorrow Six Star]

Originally Posted by Sean T.

You forgot:

3. Hatewagons are more aerodynamic usually than hatepickuptrucks, but less aerodynamic than hatehatchback-ecoboxes.

please quit killing my IQ points... I NEED those!

[Christ]

Yet another thread I'm about to jet from. Pce out, guise.

[Sorrow Six Star]

oh Christ.... been dieing to say that.

[winkosmosis]

Originally Posted by thatguitarguy

1. There might be confusion as to the purpose of a boattail.
2. What flavors does haterade come in?

1) Isn't the purpose of a boattail to cause cross section to decline rearward, IE create inward-slanting surfaces? That's what we are talking about here, cutting holes in the bumper fascia, or trimming it like in my examples.

2) It comes in "Front Aero Doesn't Matter Fruit Punch", "You Don't Need Downforce At Hypermiler Speeds Strawberry Surprise", "Just Add Wheel Skirts Juice Blend", and "Engines Don't Need Cooling Kiwi".

Edit: I forgot "That's For Racecars Where Only Downforce Matters Rasberry" which is the haterade being drunk in this thread.

[winkosmosis]

The Aerodynamic Performance of Automotive Underbody Diffusers

The data acquired demonstrate that an underbody diffuser can significantly increase downforce, and can provide some drag reduction if ride height is not too small.

[Christ]

So you're saying that those holes produce negative lift?

I'm relatively sure they don't produce anything, actually, rather negating positive lift that would normally be occurring due to the parachute effect. The notion still stands that the parachute effect wouldn't be a problem if the offending area were covered by body work, hence the obvious advantage of a rear belly pan, or the option to just cut the offending section of the rear bumper, rather than add the ineptly named "speed holes" to it.

If that wasn't your complaint, I'm not sure where the relevance was.

[winkosmosis]

Originally Posted by Christ

So you're saying that those holes produce negative lift?

I'm relatively sure they don't produce anything, actually, rather negating positive lift that would normally be occurring due to the parachute effect. The notion still stands that the parachute effect wouldn't be a problem if the offending area were covered by body work, hence the obvious advantage of a rear belly pan, or the option to just cut the offending section of the rear bumper, rather than add the ineptly named "speed holes" to it.

If that wasn't your complaint, I'm not sure where the relevance was.

What you are basically saying is that a hatchback isn't more aerodynamic than a wagon. The plain rear belly pan would be like the wagon, and cutting the lower edge or making holes (big enough holes) would be like the hatchback or adding a boattail. Air doesn't care whether it's flowing past the top or the bottom of a car.