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Nux Nux is offline
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Update:





Made a template, cut the polycarbonat and bolted it in place. 5 mm thick. No big issues.
Old 11-01-2017, 10:23 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #21 (permalink)
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Looking good. You might want to change out those bolts to a screw something like this.
Super-Corrosion-Resistant 316
Stainless Steel Extra-Wide
Rounded Head Screws for Sheet Metal
https://www.mcmaster.com/#tapping-screws/=1a2hkun
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Last edited by Trackrash; 11-01-2017 at 10:54 AM..
Old 11-01-2017, 10:51 AM
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Yeah the bolts were primarily needed to control the bend. I'll change them for some less conspicuous bolts or screws. Also maybe ad some kind of Chrome trim if possible.
Old 11-01-2017, 10:59 AM
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You know what might look good is black poprivits.
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Old 11-01-2017, 12:16 PM
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Not a bad idea!

I did think about poprivits during the install, but I would like to be able to unscrew the window for future paint or vinyl wrap. Maybe when that's done I'll change to rivets. I dig the black idea though, so maybe black screws until then.
Old 11-01-2017, 12:41 PM
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You might consider some retaining straps, as that looks to be a great big parachute which is going to see a lot of force if you're going fast.

If you want to be able to remove the window without drilling pop-rivets, but you still want the attachment not to be so obvious, a strip of black vinyl all along the edge of the window would cover them nicely. You could even use electrical tape, I bet!

--DD
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Old 11-01-2017, 01:19 PM
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Don't think the parachute effect has changed from that of an original targa? The window is bolted down to the frame and targa bar with 40 bolts. The original targa window is held by a rubber seal.

I'll have to look into that vinyl tape. Sounds like an easy fix!
Old 11-01-2017, 01:51 PM
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Best plastic window cleaner.
Amazing on old convertible plastic rear windows too.
Old 11-02-2017, 11:10 AM
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Thanks to all for updating this thread, I'm going to do this in the future.

No way that I could walk away form it now.
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Old 03-09-2018, 04:47 AM
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Some tidbits that may be helpful...

Back in the day, 1-2 companies made plastic rear 911 windows with ABS frames that were pretty easy to install. 1/8 or 3/16 inch thick if I recall correctly.

You fixed the frame to the car, and the window was affixed to the frame with a countersunk screw/washer arrangement.

See this attached picture for an example:



I think one of those companies started out with polycarbonate, and then migrated to a different material because of the poor scratch resistance of polycarbonate. They used a material called PETG (e.g., Vivak (r)).

Vivak is a little less impact resistant than polycarbonate, but scratch resistance and optical clarity are better. Kind of in between acrylic and polycarbonate.

Their windows were heat formed in a modified pizza oven using a buck.

I decided to try a similar approach using PETG to make an 1/8 inch rear window for my race car.

I do not have a pizza oven so I used a different approach for heat forming.

One thing I learned is that with heat from the sun, the plastic wants to change shape. Again, this is with 1/8 inch PETG that started out flat.

For fastening, I discovered some nice stainless countersunk washers from Aircraft Spruce:

100 CSK STAINLESS WASHERS from Aircraft Spruce

Then I bought some nice stainless 10-32 screws from them with countersink heads that match the washers.

That hardware set up is very nice and aerodynamic.

I don't have any pics of the rear window that I made. But it is similar to what was commercially available and is shown in the picture above.

I like the clarity of PETG.
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Old 03-10-2018, 02:18 PM
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