Receiver-hitch boat tail

[Phase]

Originally Posted by aerohead

Only now, with AeroStealth's Chevy BOLT, do I have access to a 'SUV' as a candidate. We've run some numbers.
The BOLT's belly is like the IONIQ hybrid. It must have rear skirts, must be paneled in, with the addition of a diffuser.
He'll get a receiver hitch installed and wired then.
When the all-aluminum cargo carrier at Harbor Freight goes on sale, we'll snag one. And begin.
John's already seen over 300-miles on a charge, bone stock.

how would a rear diffuser even be attached for an ioniq hybrid and how would it stay stiff and stable?

[aerohead]

Originally Posted by Phase

how would a rear diffuser even be attached for an ioniq hybrid and how would it stay stiff and stable?

1) Any existing holes can be re-purposed for attachment points.
2) 1/4- 20 all-thread can be cut, bent into a 'J' on one end, and slung over an existing rigid structure to create a tension member to 'hang' a subframe, skinned, and stiffened with aluminum angle extrusion, box-section, square tubing, etc.., 'pinched' against double-nutted fasteners, locked at the desired elevation for the panel.
Welded, brazed, spot-welded, bolted, self-tapping screwed, riveted, epoxy-bonded, etc..
You have exhaust heat issues, so that's got to be addressed either with custom heat-shielding, or the use of sheet metal.
10mm, fluted Coroplast would be stiff enough for non-heated locations. Throw metal at problem heat areas.
Spread compressive loads of attachment over wide fender washers, so as not to 'crush' the panel. Nyloc nuts cannot vibrate themselves loose.
Dzus fasteners are great! it your budget allows.

[freebeard]

Strips of magnetic stick-on car door sign material to bridge the gap, fastened permanently to one edge.

[Phase]

Originally Posted by aerohead

1) Any existing holes can be re-purposed for attachment points.
2) 1/4- 20 all-thread can be cut, bent into a 'J' on one end, and slung over an existing rigid structure to create a tension member to 'hang' a subframe, skinned, and stiffened with aluminum angle extrusion, box-section, square tubing, etc.., 'pinched' against double-nutted fasteners, locked at the desired elevation for the panel.
Welded, brazed, spot-welded, bolted, self-tapping screwed, riveted, epoxy-bonded, etc..
You have exhaust heat issues, so that's got to be addressed either with custom heat-shielding, or the use of sheet metal.
10mm, fluted Coroplast would be stiff enough for non-heated locations. Throw metal at problem heat areas.
Spread compressive loads of attachment over wide fender washers, so as not to 'crush' the panel. Nyloc nuts cannot vibrate themselves loose.
Dzus fasteners are great! it your budget allows.

was thinking about underbody being abs sheet and then cut out the sections that are near the muffler and use aluminum there

bolting diffuser on would be easy with the attachment points underneath. just would need to keep it stiff and stable at higher speeds so it doesnt flop around

[freebeard]

That's why I don't like receiver mount boxes/tails. They can move on three axes.

ecomodder.com/forum/showthread.php/project-ecofamily-civic-its-aero-hitch-box-boat-...

Compare a single wheel trailer, with two attachment points. It can only move on one axis.

ecomodder.com/forum/showthread.php/boat-tail-project-based-single-wheel-trailer

I proposed a 'wheel-less single-wheel' design held up by internal air pressure

[aerohead]

Originally Posted by Phase

was thinking about underbody being abs sheet and then cut out the sections that are near the muffler and use aluminum there

bolting diffuser on would be easy with the attachment points underneath. just would need to keep it stiff and stable at higher speeds so it doesnt flop around

There would be some center-to-center distance between reinforcements where the sheet material would act like a diaphragm. You'd have to figure that out, and respect that spacing, otherwise aeroelastic deformation could be induced at the speeds you're going to operate at. You don't live in Australia.

[freebeard]

Originally Posted by Phase

was thinking about underbody being abs sheet...

Polymetal would be stiffer.

[Phase]

Originally Posted by freebeard

Polymetal would be stiffer.

Maybe just a full aluminum under try with with steel reinforcement beams and structure support is a good way?

[freebeard]

Polymetal claims stiffness equal to 5/8" plywood. One could compare the weight per sq ft.

And cost.