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Old 01-18-2011, 10:49 PM   This thread is in the EcoModder Project Library | #1 (permalink)
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Wink t_vago's compound curve foam board pickup aeroshell

This is what I originally came up with for my truck.


Underlying frame


Side view, right-hand side


Side view, front facing rear


Rear view

I waited too long to coat it, and it disintegrated during one of my commutes. Version 2 will be a bit less aggressive.

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Old 01-19-2011, 01:53 AM   #2 (permalink)
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Looks great!

How much did that cost you? How did it disintegrate? Did you yarn tuft test it at all? How did you come up with that design?

I don't think I want to go that aggressive as I need to load/unload things from the truck bed...hence why I have a hatch on mine. I still have a few sheets of coroplast so I'm gonna stick to that material fer now...until I git the itch to use something else.
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Old 01-19-2011, 10:48 AM   #3 (permalink)
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Quote:
Originally Posted by t vago View Post


I waited too long to coat it, and it disintegrated during one of my commutes. Version 2 will be a bit less aggressive.
Your compound curvature is outstanding. Absolutely beautiful. What thickness foamboard did you use? Any fabrication tips you can share? I don't see any burn marks for example.

Sorry it died. What MPG improvement did you quantify?

Keep us posted on Version 2.
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Old 01-19-2011, 10:54 AM   #4 (permalink)
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Would love to see tuft testing of that as well.
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Old 01-19-2011, 11:14 PM   #5 (permalink)
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Well, I formed the frame out of 1 inch thick FoamulaR insulation. The ribs and rails were initially cut using a jig saw, then fine-tuned using a finger-cutting knife (actually, one of those As Seen On TV knives that are supposed to cut anything from a ripe tomato to an aluminum can, but the knife I used couldn't cut cooked meat worth a darn but was excellent at cutting fingers - hence "finger-cutting knife").

The height and width of each rib were calculated using Microsoft Excel, based off of that paper written by that Naval PostGrad sailor, and my memories of how the snow formed itself on the tonneau cover of my truck last winter. I didn't want to bother with sharp edges, because they're harder to work with, with regard to being able to coat the exterior with fiberglass or something, so it was made as curvy as possible.

The ribs and rails were glued together with Gorilla Glue and a lot of water to ensure the foaming action necessary for the Gorilla Glue to work. The skin was made with 8 sections of FoamulaR 1/4 inch sheeting. Each sheet was partially cut, then partially glued onto the ribs, repeatedly until each sheet was completely glued onto the ribs. The sheeting was held in place by weights placed on the seams (things I had in the garage - spare crank pulleys, spare car radios, spare alternator, jumper cables, etc.) while the glue set.

The aerocap failed because the rear ribs and the side mounting rails were too thin to support the vibrational stresses imposed on the aerocap while the truck was travelling at speed. This was compounded by shrinkage of the rear 1/3d of the aerocap to the point where the rear was able to be wiggled by hand. The combination of the two causes caused the rear 1/3d ribs to fracture and separate from the mounting rails. The rear of the aerocap, no longer joined to the truck, caused the rest of the aerocap to break along the mounting rails, and then lift off the truck altogether. The aerocap flew upward about 10 feet, and luckily landed in the center divide of the highway, but the rear 1/3d completely disintegrated. I could recover the main part, but it was completely unrepairable.

I should have secured it more firmly at the rear, I should have used thicker ribs and rails, and I should have stiffened the skin with fiberglass. These will be applied to version 2.

I imagine that tuft testing would have revealed some turbulence around the rear of the aerocap, because I think the vertical slope was a bit too aggressive.

I was able to quantify a gain of 1 MPG from this aerocap. Incidentally, the same testing revealed absolutely no gain whatsoever from having a tonneau cover installed.
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Last edited by t vago; 01-22-2011 at 02:43 PM.. Reason: Added link to Naval PostGrad paper on aerocaps
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Old 01-20-2011, 04:20 AM   #6 (permalink)
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Very nice to have seen and read about. Hope to see more in version 2.
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Old 01-20-2011, 10:37 PM   #7 (permalink)
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Quote:
Originally Posted by t vago View Post


Rear view
I have to tell you, I wish you had posted those when I still had my Ranger, I would have copied it (if you didnt mind, that is)
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Old 01-21-2011, 09:59 AM   #8 (permalink)
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T Vargo, you need to separate your project out in its own link. It is very nice. I suspect you're right about the V1 cap being too aggressive, keep the same shaping ideas, but only taper down about 6 - 8 inches front to back and make the transition from rear of cab to cap very gradual, your V1 appears to dive right in.

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Old 01-21-2011, 10:18 AM   #9 (permalink)
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Split this into its own thread. Good idea.
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Old 01-21-2011, 11:30 AM   #10 (permalink)
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Awesome work! I really like seeing how well the 1/4" foam works on compound curved surfaces.

You have got me thinking very hard about going this route with my CarBEN EV design.

Are you going to skin it with fiberglass? Is Gorilla Glue and this glue compatible with fiberglass? If so, what sort?

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aerocap, aerodynamic, aeroshell, dakota, truck

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