Swiss Cheese 911

"Bob Loblaw Made Me Make a Phoney Phone Call to Edward Rooney" (braddelaparker)
05/06/2020 at 10:08 • Filed to: None

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DISCUSSION (34)

WasGTIthenGTOthenNOVAnowbacktoGTI > Bob Loblaw Made Me Make a Phoney Phone Call to Edward Rooney
05/06/2020 at 10:15

I get everything but the seat. Seems like you wouldn’t want to mess with the rigidity of that.........

EDIT: Holy cats, I looked through the pictures on the link, and......wow. That’s something else. It’s weirdly pretty in some places.

Michael > WasGTIthenGTOthenNOVAnowbacktoGTI
05/06/2020 at 10:17

Seems to me if you crash the whole structure is collapsing around you anyway. Add lightness, not stupidity. Maybe about 40% of those holes were in structural components

gmporschenut also a fan of hondas > Bob Loblaw Made Me Make a Phoney Phone Call to Edward Rooney
05/06/2020 at 10:20

UserNotFound > Bob Loblaw Made Me Make a Phoney Phone Call to Edward Rooney
05/06/2020 at 10:20

Would be 1000% more legit if they had used a dimple-die every hole they made (except on the cast parts I guess)

CalzoneGolem > Bob Loblaw Made Me Make a Phoney Phone Call to Edward Rooney
05/06/2020 at 10:21

Probabl y some fat guy driving it around.

3point8isgreat > Bob Loblaw Made Me Make a Phoney Phone Call to Edward Rooney
05/06/2020 at 10:24

“ I just carefully analysed every component and decided on three things: Do I need it? Can I lighten it? Or can I replace it with something more efficient?”

Something tells me the “analysis” wasn’t actual math. That many holes would be a nightmare to actually analyze for strength. Let alone how hard it’d be to get reliable input loads to start your calculations with.

MonkeePuzzle > UserNotFound
05/06/2020 at 10:24

in the linked article he noted that its all dimple died to add rigidity where material was removed

ClassicDatsunDebate > UserNotFound
05/06/2020 at 10:29

He did. It says so in the interview.

Rusty Vandura - www.tinyurl.com/keepoppo > Bob Loblaw Made Me Make a Phoney Phone Call to Edward Rooney
05/06/2020 at 10:31

Throw It a turn with lateral g forces simultaneously hitting a couple of sharp bumps in the track, and see things begin to crease and buckle. I can't see this as being all that great of an idea.

Future next gen S2000 owner > 3point8isgreat
05/06/2020 at 10:31

If you had the hole(get it? I kill myself) thing modeled it wouldn’t be that difficult to run it through FEA. I agree though, I don’t think much real analysis was involved. More along the lines of, does it bend when I move it. Yes, enough holes. No, add more holes.

Jordan and the Slowrunner, Boomer Intensifies > Bob Loblaw Made Me Make a Phoney Phone Call to Edward Rooney
05/06/2020 at 10:32

Hope the clutch or flywheel doesn't let go.

ClassicDatsunDebate > Bob Loblaw Made Me Make a Phoney Phone Call to Edward Rooney
05/06/2020 at 10:33

Adding the stamped ‘return lip’ makes a huge difference in rigidity. He couldn’t have done such a dramatic job without it. I’ll bet that dash panel, or most of those panels, are harder to twist now than the original.

3point8isgreat > Future next gen S2000 owner
05/06/2020 at 10:53

FEA can do it, but getting good and useful results will be a challenge and time consuming . Getting a model the size of even one of the panels he drilled to give good results could take hours. And that all assumes you know how each part is loaded. Trying a model of the whole car at once, using the mesh size necessary to pick up each hole, would probably cause even a good engineering desktop to catch fire.

K-Roll-PorscheTamer > Bob Loblaw Made Me Make a Phoney Phone Call to Edward Rooney
05/06/2020 at 10:54

Trying to outdo the OG Widowmaker.... with the Trypophobian Widomaker. I’ve been following this on and off for a time, I’m genuinely curious to see how this thing rides and drives, or if it’ll jackkni fe in the first porthole.

Highlander-Datsuns are Forever > Bob Loblaw Made Me Make a Phoney Phone Call to Edward Rooney
05/06/2020 at 10:54

So are these considered speed holes?

Future next gen S2000 owner > 3point8isgreat
05/06/2020 at 10:56

That’s true. End constraints would be a pain and well as correct loading. Trying to do the whole car at once would be hilarious. I’d love to give it a shot. I’ve got a pretty solid desktop back at the office....miss that stupid thing.

UserNotFound > MonkeePuzzle
05/06/2020 at 11:10

He did SOME holes. I want EVERY holes.

Thomas Donohue > CalzoneGolem
05/06/2020 at 11:20

I was thinking the same thing, but he looks to be a pretty small, fit guy.

1300 lbs, 220 horsepower. I doubt he adds more than a buck-fifty.

Kinja'd!!!

CalzoneGolem > Thomas Donohue
05/06/2020 at 11:31

That’s less funny.

Thomas Donohue > CalzoneGolem
05/06/2020 at 11:37

Sorry. But I assure you that in a few years when it’s auctioned off, it will need new seats to fit the 265-lb, 5' 8" owner.

In buying the lightest 911, h e will have only lightened his wallet, not his waist.

Thomas Donohue > Bob Loblaw Made Me Make a Phoney Phone Call to Edward Rooney
05/06/2020 at 11:40

Makes sense that this guy also rides a Trek Emonda SLR 10, which is one of the lightest bikes made at just over 10 lbs.

Kinja'd!!!

My bird IS the word > 3point8isgreat
05/06/2020 at 11:53

If it was mathematical, wouldnt everything be equilateral triangles instead of circles?

MonkeePuzzle > UserNotFound
05/06/2020 at 11:55

Kinja'd!!!

RallyWrench > Bob Loblaw Made Me Make a Phoney Phone Call to Edward Rooney
05/06/2020 at 12:06

The bellhousing? Nope nope nope nope.

3point8isgreat > My bird IS the word
05/06/2020 at 12:32

I believe that’d depend on how each component is loaded. Most components will probably function like beams that see some combination of bending, and axial compression/ tension. In this case a normal beam cross-section, like an I-beam or round tube , would be best.

You could try to make triangles out of these beams though. Think of a racecar chassis or cage made out of round tubing. If you use an I-beam shape you could just make the web thinner instead of cutting holes.

Taking triangles out of flat plates creates high stress concentrations from the sharp corners. Granted since the idea is you put holes in places of low stress this shouldn’t fail from outright strength. But may become a fatigue issue if pushed too far. Circles still locally raising stress but not as bad as a sharp corner.

To give an idea of numbers here, the H ighest stress concentration factor (in tension) for a circle hole is 3, so the peak stress near a hole is 3x the average stress. Meanwhile the Lo west factor for an hole shaped like an equilateral triangle with rounded corners is about 3.8 and rapidly goes up as the corners get sharper.

Essentially triangles work well for making a whole rigid structure. But doesn’t always work as well on all individual components making up that structure. That said you will still see triangles show up within some components. All depends on the specific conditions of that component.

3point8isgreat > 3point8isgreat
05/06/2020 at 12:44

Sorry this was probably way more detail than necessary. I just get excited when I have an excuse to crack open a textbook.

Tareim - V8 powered > K-Roll-PorscheTamer
05/06/2020 at 12:49

strangely enough this doesn’t trigger any form of tryp for me like other typical examples would

This is what we'll show whenever you publish anything on Kinja: > Thomas Donohue
05/06/2020 at 13:45

That was a s ixteen-thousand-dollar bicycle. Can be had used for 4k.

slowblink.gif

My bird IS the word > 3point8isgreat
05/06/2020 at 14:11

No, I am interested, even as a non engineer. Ever since I bui lt a balsa wood tressle bridge for a science fair project in elementary school that suspended 150 lbs, I have learned the power of triangles. That kinda stuff has a tendency to stick with you.

Highlander-Datsuns are Forever > Thomas Donohue
05/06/2020 at 14:19

Other than the wheels, there is nothing on that bike that couldn’t handle me a 190 lb dude with ease. The wheels would be okay for a race but would probably start to fall apart after 500 miles if I didn’t outright break them.

imadick > This is what we'll show whenever you publish anything on Kinja:
05/06/2020 at 16:05

If your car costs more than your bike you are living life wrong...

pip bip - choose Corrour > Bob Loblaw Made Me Make a Phoney Phone Call to Edward Rooney
05/07/2020 at 03:43

A Boy and His Longtail > My bird IS the word
05/07/2020 at 09:13

You can take out more weight using circles instead of triangles for the same loss in integrity. It would likely be harder to model.

A Boy and His Longtail > Bob Loblaw Made Me Make a Phoney Phone Call to Edward Rooney
05/07/2020 at 09:16

You know, structural rigidity isn’t THAT important