How to decide whether to remove rear spoiler to decrease drag, improve mileage

[CobraBall]

Great looking Black Deuce Coupe.

I'm curious, why a "deuce coupe" which is usually associated with the 1932 Ford Coupe and the Beach Boys. http://static.howstuffworks.com/gif/...-hot-rod-2.jpg

[99clipsgst]

I know that I have a good size spoiler but it's OEM. Since the eclipse already has a low drag coeffecent would this spoiler be better on or off?

[aerohead]

It's too tall for drag reduction,and it's chord is too short for any appreciable downforce(which you wouldn't need anyway).I'd say its just for styling purposes.It probably generates a little drag,so removing is okay,however,drag may be so low,its a wash.It's your call.

[CobraBall]

BlackDeuceCoupe

Love the 5 window coupe w/ the Olds thru the valve cover spark plug wires.

Best friend has a 34 Plymouth 4dr. PE with a '57 Dodge Hemi.

I've got a '33 Ford chopped full fendered Tudor w/ 350/350.

At $3.90/gal it is once a month driver.

[CobraBall]

99clipsgst

You might tuft test w/ and w/out the spoiler. Have someone photo the tests. I would place the tufts on the back of the rear decklid. I suspect the test will show no effect on the tufts providing you aren't running flat out.

[CobraBall]

Black Deuce Coupe,

Maybe a 32 Hiboy with a turbo 4 banger, 5 speed. Probably 2200-2300 lbs. HP dependent on boost.

Have you been to the Bonneville Nationals in August?

CB

[CobraBall]

The Bonneville Nationals is a PhD in streamlining.

Seeing the Nebulus Theorem, Turbinator, or Al Teague has been awe-inspiring. Burland at 422 with 50% power . If you ever go, take Plenty of WATER and SUNSCREEN (cover everything exposed and not exposed). The guys/gals in the pits are very friendly and approachable. The pits are so big that a bike would help.

[Piwoslaw]

What about spoilers for hatchbacks? I've noticed a few types:
- Type 1 - placed below the rear window
hatchback_spoiler_low1.jpg
- Type 2 - above the window, extending above the roofline with a gap under it
hatchback_spoiler_high2.jpg
- Type 3 - above the window, extending the roof horizontally of slightly down
hatchback_spoiler_high3.jpg
- Type 4 - above the window, tiny
hatchback_spoiler_high4.jpg

Here is a Honda with two spoilers, types 1 and 3
hatchback_spoiler_high5.jpg

Which of these will help or hurt FE? I can tell that type 2 probably produces drag, but what about type 1? Does the tiny type 4 do anything?

[Daox]

1 will do nothing for aero, its just added weight.

2 will add drag

3 will help a very small amount IF it slopes down slightly

4 will make no noticable difference

[MetroMPG]

I agree with Tim's reply.