Succesfull fule mileage increase with Snow board wind deflec

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Re: Succesfull fule mileage increase with Snow board wind de

Postby printer » Mon Aug 02, 2021 4:53 pm

Socal Tom wrote:In the test with the car/spoiler, you would want the spoiler to be at a higher angle, like 45%. In your picture its almost flat.


Yes I did it at about 45 degrees on the last run. Those were from earlier runs. I had to make the spoiler touching the trailer otherwise the positive pressure of the trailer gets sucked under the trailer. I guess I could make it bigger but I still wanted to be able to see out the back window.

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Re: Succesfull fule mileage increase with Snow board wind de

Postby Socal Tom » Mon Aug 02, 2021 7:47 pm

You could put the spoiler above the rear window, ( on the roof) and see how that goes.

FWIW, this is how my rig worked out.
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Re: Succesfull fule mileage increase with Snow board wind de

Postby tony.latham » Tue Aug 03, 2021 8:49 am

One problem with these online wind tunnels is they are 2D and our vehicles and teardrops have that damn third dimension. :D

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I noticed a significant difference when I bumped from a 4' wide teardrop to a 5' a decade ago.

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Re: Succesfull fule mileage increase with Snow board wind de

Postby printer » Tue Aug 03, 2021 12:32 pm

tony.latham wrote:One problem with these online wind tunnels is they are 2D and our vehicles and teardrops have that damn third dimension. :D


I noticed a significant difference when I bumped from a 4' wide teardrop to a 5' a decade ago.

Tony

Yes, take the information it gives you with a grain of salt on how much it applies to you. But I would not have thought the air from my car would go under the trailer and the outline with the 'skateboard' on a SUV type vehicle does what the video says but a spoiler does not seem to help a sedan. I was going to make a model of my car and a trailer, make a little wind tunnel, use smoke to see what happens. But this is much faster. My main question was whether a teardrop type is much more different in wind loading as a square back. I got my answer and more in a couple of hours trying different arrangements. I would not use it to do minimal changes trying to get a best performer, but as a sanity check it is not so bad.
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Re: Succesfull fule mileage increase with Snow board wind de

Postby Modstock » Thu Aug 12, 2021 6:09 pm

Socal Tom wrote:You could put the spoiler above the rear window, ( on the roof) and see how that goes.

FWIW, this is how my rig worked out.
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I was thinking the same thing, might help his car out.

Remember a few years ago NASCAR put a "wicker bill" on thier rear spoiler.
Basically its a piece of aluminum angle iron, L-bracket accross the fin.
It didnt help the cars much but it did help drafting and 2 cars could go way faster. Punched a bigger hole in the air , as they say.
I wonder if this could help towing a trailer ???

Always wondered what those
"air tabs" would do mounted accrossed a rear spoiler/wing .

I ponder way too much car stuff .


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Re: Succesfull fule mileage increase with Snow board wind de

Postby gudmund » Thu Aug 12, 2021 7:21 pm

with the roof rack I see on top of your vehicle in the picture here, I see an 'angled edged' roof panel mounted on the front the rack being used = I would be trying a larger angled piece of material, making it long enough - exstending it down for contacting to the vehicle roof. This could help 'in kicking' the air "up" from the hood/windshield area "up and over" thus maybe getting it to travel higher so as to clear the trailer as it travels over everything. (a piece of plywood or something may work for a test of this :thinking: )
Air tabs = 'vortex generators' I have looked at them also, they are support to help in making the air travel 'straighter' as it passes over everything :? :thinking:
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Re: Succesfull fule mileage increase with Snow board wind de

Postby Modstock » Thu Aug 12, 2021 10:25 pm

Ive actually done those very things to that roofrack.
Made a bigger wind deflector up front and lessened the angle to match the windshield angle. Also have a small deflector at the rear.
Moving the RR back as far as I could helped alot.
Those few things were a big improvement.
To get it lower alot of cutting and re-welding would be required.
This vehicle is now retired from towing duty.
New truck with a shell taking over.

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Re: Succesfull fule mileage increase with Snow board wind de

Postby gudmund » Sat Aug 14, 2021 1:01 pm

a different vehicle could show some kind of a change, but looking at this picture - if that is the trailer you are still using? - with the "v'ed" front = I really don't think you could do much better than what you already have there. The only other thing is to just -like we have been saying here- getting the air to kick "up and over" the top of everything so as to clear the trailer top when it drops back down at hi-way speeds. Take care :thinking:
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Re: Succesfull fule mileage increase with Snow board wind de

Postby Modstock » Mon Aug 16, 2021 7:39 pm

This should do better. Oh and V8 .
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Now I gotta figure out how to mount the snowboard.


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Re: Succesfull fule mileage increase with Snow board wind de

Postby gudmund » Mon Aug 16, 2021 11:31 pm

Being I now see a canopy/topper, if you could find a set of canopy tracks (Yakima or Thule) Warning - they are not cheap = saw $$'s around $150+ for a set - found my set on Amazon for $111(new) and than was able to find a used set of Yakima mounting cross-bars from a canopy sales/lot for $25. Was quoted $50/75 for mounting the tracks, so I did it myself, came out good! - I just make sure to measure 'a-lot' thus keeping them in square/side-to side parallel with each other and be careful when drilling the fiber-glass and seal it good. (it seems to want to 'chip' when being drilled=probably not the right ?drill bit/drill speed?) Once I got the tracks mounted, everything was just an easy bolt on along with being very adaptable for different variations/angle changes for trying different set-ups. The rack you were using before may still be an option with it's angled front-edge panel (little side note-you kind of have nice 'angle reference-guide' built into this picture you posted here with that "stair-way" in the back ground on the side of that building) that could be easily re-mounted to this canopy track & cross-bar set-up I am speaking of here. This picture shows the tracks installed on top of my canopy 166933 19Aug21 was just on E-trailer and saw that they carry 'Rhino-Rack' brand canopy tracks for about $100/115 for a set of them ....... :thinking:
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Re: Succesfull fule mileage increase with Snow board wind de

Postby Dan242 » Thu Sep 09, 2021 11:44 pm

I thought alot about aero. Not just for mpg, but less strain on the tow vehicle. I built a square drop with a V nose and roof slanted downward. My door is on the rear and vertical so I added some slanted sides like the Semis use. I towed it 2500 miles a while back and fuel mileage was not far off and it pulled awesome, never had issues with Semis passing and making it shimmy etc. ImageImage
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