How to calculate pounds of force on decklid spoiler

[freebeard]

Plastidip!

[California98Civic]

Originally Posted by freebeard

Plastidip!

hAHAHA! Of course, right?!

[aerohead]

Was noodling thoughts about the magnets.
The equivalent tensile holding power should approach what the common fasteners would have had.Say,that of 3,grade-8,10mm bolts,up into the cast-in-place riv-nuts on the spoiler's underside.
You'd have no protection against shearing forces though.If the foil had any resonance,she could try and walk right off the back of the car.(Frank Lee's 18-wheeler bow and stern blast).
You could have a lanyard on it like the Dodge Daytona Charger,so it couldn't get away from you.
Seems like the liability would outweigh the convenience of no body penetrations.
It scares me just thinking about it.I myself would chicken out.

[freebeard]

An alternative might be finger clamps that grip the edges of the decklid (or hatch).

[markweatherill]

Does the spoiler have to be removable?

[California98Civic]

Originally Posted by markweatherill

Does the spoiler have to be removable?

I like removability because I want to be able to test it. I want to be able to take it off and put it back on with ease for A-B-A-B testing and such. Also, built to be removable means I can change the mounting configuration at will, without worrying about holes in the decklid. Take a look in the design/build thread and you will see the current version. Holds well using neodymium magnets. Removable in under 10 seconds.

[j-c-c]

My take on the OP's problem:

1. Take your best guess, and then go 5x?
2. Strong enough magnets, no matter what protective layer you add, will likely scratch the paint by way of any dirt/sand/etc that collects on the, and then the strong magnet will nicely embed in the magnet cover. Of course keep the area COVID clean will reduce this issue when installing or removing.
3. And prudence IMO, would suggest a loose nylon? safety tether while testing. The forces to be calculated would have to as mention allow for odd wind gusts, from semis, etc, in addition, to rain reducing shear attachment, and road shock loads from roads aberrations/curbs/etc. So no matter what, you will have a big fudge factor, and the safety tether will help reduce that, IMO.

[freebeard]

Take a look in the design/build thread and you will see the current version.

[citation needed] of course.

[California98Civic]

Originally Posted by j-c-c

My take on the OP's problem:

1. Take your best guess, and then go 5x?
2. Strong enough magnets, no matter what protective layer you add, will likely scratch the paint by way of any dirt/sand/etc that collects on the, and then the strong magnet will nicely embed in the magnet cover. Of course keep the area COVID clean will reduce this issue when installing or removing.
3. And prudence IMO, would suggest a loose nylon? safety tether while testing. The forces to be calculated would have to as mention allow for odd wind gusts, from semis, etc, in addition, to rain reducing shear attachment, and road shock loads from roads aberrations/curbs/etc. So no matter what, you will have a big fudge factor, and the safety tether will help reduce that, IMO.

My paint is not good anymore, and I've been letting it slowly build patina for the most part. I think the safety tether is really important, and I've been considering how to do that.

Originally Posted by freebeard

[citation needed] of course.

I think I will make a new version this year & it can become the current [with citation] ...

[aerohead]

The nylon 'dental floss' aircraft electricians use to tie off aircraft electrical looms would have high tensile strength, and while flat, and 'small', if combined with a captured 'knot' ( a dog's soft rubber donut chew toy), run under the trunk lid weather stripping into the trunk, might be all that was needed, should the magnetic grip go south on you.