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Stampie
Stampie UberDork
11/7/18 6:25 a.m.

I walked out the door this morning and had a wtf moment. 

Seems my teammate decided to deliver the signs she got during the night. Now I can make all the corrugated plastic aero. 

 

alfadriver
alfadriver MegaDork
11/7/18 7:04 a.m.

Can you move this to the projects area?  I'd like to see how people do this- as when I see that stuff, it's strong in bending for one direction, but not so much the other- it's basically plastic corrugated cardboard.  And I know that folds easily one direction, really hard the other.

It will be interesting to see, really, how people use it.

Dusterbd13
Dusterbd13 MegaDork
11/7/18 7:13 a.m.

Im with alfa.

sleepyhead
sleepyhead Dork
11/7/18 7:13 a.m.

re: wing building

it should be fine for that, as long as you have enough ribs... and you have a sufficiently strong spar running spanwise about 25% back from the front edge (another one around 75% will help it stay at the right angle, but doesn't need to be as beefy)

Patrick
Patrick MegaDork
11/7/18 7:21 a.m.

 

Free coroplast and some pine bucking

 

Plus fiberglass mat

 

 

Equals spoiler that holds up at 120+

 

Stampie
Stampie UberDork
11/7/18 7:23 a.m.

In reply to alfadriver :

When I start on them I'll put it in the build section.  For those into salt water aquariums I used to make pod (small marine animals) condos with these that I'd float in the sump.  Just cut them into 3x5 sections and rubber band them together.  The little holes make great hiding places for the pods.

STM317
STM317 SuperDork
11/7/18 7:30 a.m.

I bet if you did 2 layers of coroplast and alternated the direction 90 degrees so that he corrugation was perpendicular it would become much stronger on more than a single axis.

Seems like most coroplast is 4 or 5 mm thick, so you could have 2 layers and still be under half an inch thick.

GameboyRMH
GameboyRMH MegaDork
11/7/18 7:35 a.m.
STM317 said:

I bet if you did 2 layers of coroplast and alternated the direction 90 degrees so that he corrugation was perpendicular it would become much stronger on more than a single axis.

Seems like most coroplast is 4 or 5 mm thick, so you could have 2 layers and still be under half an inch thick.

This, and the layers bond really well with super glue.

Patrick
Patrick MegaDork
11/7/18 7:46 a.m.

In reply to STM317 :

That’s how i did mine.  I had 4x8 sheets show up in the ditch when someone presumably drove down the street without sufficient tie downs.  

Robbie
Robbie UltimaDork
11/7/18 8:16 a.m.
GameboyRMH said:
STM317 said:

I bet if you did 2 layers of coroplast and alternated the direction 90 degrees so that he corrugation was perpendicular it would become much stronger on more than a single axis.

Seems like most coroplast is 4 or 5 mm thick, so you could have 2 layers and still be under half an inch thick.

This, and the layers bond really well with super glue.

Do they bond well with super glue? My internetting has told me otherwise.

nderwater
nderwater UltimaDork
11/7/18 8:49 a.m.

Interesting.  How well does the clear stuff stand up to UV before yellowing?

STM317
STM317 SuperDork
11/7/18 9:03 a.m.

In reply to Robbie :

Maybe scuffing them up so they're not as slick and shiny would make super glue work better?

GameboyRMH
GameboyRMH MegaDork
11/7/18 9:13 a.m.
Robbie said:
GameboyRMH said:
STM317 said:

I bet if you did 2 layers of coroplast and alternated the direction 90 degrees so that he corrugation was perpendicular it would become much stronger on more than a single axis.

Seems like most coroplast is 4 or 5 mm thick, so you could have 2 layers and still be under half an inch thick.

This, and the layers bond really well with super glue.

Do they bond well with super glue? My internetting has told me otherwise.

From my experience, yes they bond very well. I've just dashed some on and stuck the layers together with just a quick wipe with brake cleaner as prep, they were stuck so well that it's hard to pry them apart without severely damaging the individual layers. If you were to also scuff the surfaces first and apply a proper even coat of super glue, I'm sure you'd tear the corrugation apart completely before you separated the layers.

Robbie
Robbie UltimaDork
11/7/18 9:40 a.m.

In reply to GameboyRMH :

excellentdevil

sleepyhead
sleepyhead Dork
11/7/18 9:43 a.m.

anyone for biased double layer calibrated bending load tests?  ( I don't have the signs available where I am )

Stampie
Stampie UberDork
11/7/18 9:43 a.m.

In reply to Robbie :

I think I'm going to experiment with plastic welding cause nothing's better than hot plastic stuck on your skin. 

Robbie
Robbie UltimaDork
11/7/18 9:47 a.m.
Stampie said:

In reply to Robbie :

I think I'm going to experiment with plastic welding cause nothing's better than hot plastic stuck on your skin. 

I have also thought about the ring rivets (grommets?) like in the edges of tarps. Dunno if they'd handle the thickness.

Patrick
Patrick MegaDork
11/7/18 10:14 a.m.

I used hot glue.  It worked very well, and where I attached it to the wood supports i used drywall screws.  Second layer just glued to first at 90*.  

NOT A TA
NOT A TA Dork
11/7/18 10:25 a.m.

I've used pop rivets with body washers. This is under tray for one of my cars. Side pipe exhaust so aluminum where headers and pipes are with 10 mm plastic center to keep weight down. Diffuser will also be corrugated plastic.

[URL=http://s240.photobucket.com/user/NOTATA/media/The%2014%20Car%20Performance%20Therapy%20part%202/20170917_120349_zpsmlqlqnq2.jpg.html][/URL]

[URL=http://s240.photobucket.com/user/NOTATA/media/The%2014%20Car%20Performance%20Therapy%20part%202/20170923_174457_zpsbauyzlbo.jpg.html][/URL]

NOT A TA
NOT A TA Dork
11/7/18 10:27 a.m.
sleepyhead said:

anyone for biased double layer calibrated bending load tests?  ( I don't have the signs available where I am )

Come up with a method and I'll do it.

Toebra
Toebra Dork
11/7/18 12:37 p.m.
alfadriver said:

Can you move this to the projects area?  I'd like to see how people do this- as when I see that stuff, it's strong in bending for one direction, but not so much the other- it's basically plastic corrugated cardboard.  And I know that folds easily one direction, really hard the other.

It will be interesting

You assemble them with the corrugations perpendicular to one another, and it will be stiff.  I scuffed them up with red scotch pad and used hot glue gun in the past.  Far fewer signs this year than in the past

Aaron_King
Aaron_King PowerDork
11/7/18 1:14 p.m.

The vast majority of the signs I saw this year were just plastic sheeting.  I was wanting to make new undertrays for our cars.

stafford1500
stafford1500 HalfDork
11/7/18 2:44 p.m.

Not free but my local Home Depot carries coroplast in 4ft*8ft sheets, in two thicknesses 3mm and 10mm

Stampie
Stampie UberDork
11/7/18 5:03 p.m.

Patrick
Patrick MegaDork
11/7/18 5:17 p.m.

Metal to shape the plastic over!

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