Roof Air Spoiler

Roof Air Spoiler

Postby Digidonny [OP] » July 16th 2021, 8:35pm

Since we only have a 4.3 V6 which is not a super power machine has anyone been successful installing a roof spoiler to use when pulling a cargo trailer (not a V-nose). Has it helped with wind resistance and given you any more power and speed ?
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Re: Roof Air Spoiler

Postby sixsix » July 16th 2021, 9:29pm

I cannot imagine how a roof spoiler ( AIR DAM ) is supposed to help w/ aerodynamics or noise or drag or etc, etc, etc.

EDIT: Sorry, I was thinking of the "over the windshield - visor - cowl thingie".... sorry
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Re: Roof Air Spoiler

Postby markmitch » July 16th 2021, 9:43pm

The idea is to cause the air going over the roof to go up over the trailer instead of hitting the trailer and causing more fuel usage. In Theory it would work however anything protruding from the body IE the mirrors, roof rack, or even a spoiler will cause turbulence too. So in reality a roof spoiler may look cool and may even add traction when going over 100 MPH but otherwise its not really going to do much for you.
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Re: Roof Air Spoiler

Postby MI_Ghost » July 17th 2021, 5:53am

And it does not cause much drag either. I added a Prelude spoiler to my 88 and have an Impreza spoiler for the 01. The double 3rd brake light is a quite a sight.
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Re: Roof Air Spoiler

Postby Rod's Trucks » July 17th 2021, 4:47pm

I tried to reply yesterday, but the post just vanished...seems to happen to me a lot.
Anyway, Aerodynamic drag is directly related to speed. Drag increases exponentially with speed.
You asked about more Power and Speed.

You have a fixed amount of Power, so speed is the significant variable.

On a long haul trip, with a well defined baseline as a reference, youmight be able to detect an improvement.
I doubt any significant improvement would be shown during normal trips and a the speed limits we are dealing with.
The long-haul truckers have used several devices at their disposal, put many thousands of miles on their rigs, and do show some improvement.
Probably the fairing between the tractor cab and a trailer is the biggest help, but your trailer is not going to be coupled close enough to get any improvement from a roof top spoiler.
Those semi-truck devices do produce a small improvement, but it is a very small percentage. I think if it was significant, more would be using those devices.

I would recommend staying more in the right lane, and keeping with the truck speed limits for the most part, to improve your mileage and enjoy a bit of the scenery. ;)
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Re: Roof Air Spoiler

Postby chevymaher » July 17th 2021, 5:17pm

Yes they eliminate or reduce the parachute effect. Low pressure and turbulence behind the van. If adjusted correctly.

There used to be a wind tunnel shot of one on a dodge tradesman van. With the white wisp of trailing smoke with and without spoiler. It clearly was doing a real good job.
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Re: Roof Air Spoiler

Postby Digidonny [OP] » July 21st 2021, 4:40pm

Thanks to all !!! Yea I like Rods Trucks reply... forget about trying to go 70 and settle for 50-55 up hills. I can enjoy the scenery and arrive at destination a short time later !!!
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Re: Roof Air Spoiler

Postby Godron629 » July 21st 2021, 5:41pm

@MI_Ghost you have impreza spoiler on an 01 astro? Got pics?
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Re: Roof Air Spoiler

Postby smokinjoe » July 22nd 2021, 3:20am

I built one for my first astro many years ago. Not sure if I still have the pics but it was just what you described made of sheet metal.
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Re: Roof Air Spoiler

Postby MI_Ghost » July 23rd 2021, 12:44am

Godron629 wrote:@MI_Ghost you have impreza spoiler on an 01 astro? Got pics?
:
Not installed yet. Not the tall racing spoiler. Just the short whale tail deck spoiler. It looked good when I had it sitting on the top.

Sarona Design offers several different styles.
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Re: Roof Air Spoiler

Postby Godron629 » July 23rd 2021, 2:17am

Ah OK. I figured it was one of these lookin things...

112988_1.jpg


I like the look of these on vans, at some point I'd like to point some spoilers on mine - I do like the front visor, it is Oh So Nineties :dance:
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Re: Roof Air Spoiler

Postby Ironsides » July 23rd 2021, 1:54pm

I have considered a rear spoiler or diverter as my trailer if flat nosed as well. I also considered making a trailer nose cone, nothing fancy, just adding some frame to build on, then use foam to build it out like the guys talk about here: https://www.astrosafari.com/viewtopic.php?f=127&t=104218&hilit=foam+trailer+build&start=80 or you could just buy a trailer nose cone. Look to the 5th wheel set-ups and wind deflectors, some are adjustable. I also considered Air Tabs.
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Re: Roof Air Spoiler

Postby DriveDog » July 23rd 2021, 4:01pm

The most effective device would be something that fills the space between the van and trailer. I planned, for a car/small trailer, to implement a screw device that "reels in" the trailer at highway speeds and lets it back out when slowing. There are all sorts of potential problems, some dangerous, and I'm pretty sure if mobile DMV officers (usually chase overweight truckers in my region but occasionally decide to hand out tickets to passenger autos) figured out what I'm doing they'd jump on it somehow. Also, it'll require a short-tongue trailer which in my experience is bad news as trailer weight and length go up. Anyhow, I'll be experimenting on a small scale (xB pulling dinky super-light hand-built trailer). Thoughts welcome, other than "you'll shoot yer eye out". :lol:
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