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11-01-2016, 03:08 PM
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Join Date: Dec 2011
Location: Roanoke, Va
Posts: 36
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Melted canopy
I got a utility lamp to close to the canopy. This caused the canopy to melt causing a concave in the canopy.
I tried pushing the canopy back up after heating it to 200 degrees.the concave got worst.
I turned the canopy upside down, heated up the Plexiglas from the inside of the canopy and was able to remove some of the disfigurement.
I then turned the canopy over, placed utility lamp on the outside of the canopy, heated up to 225 degrees and placed a mold on the inside of the canopy and place 60 pounds of mold and left over night. This got more of the concave out, I still have about a 1/8 inch concave.
In all this stretching and melting I created two nipples on the outside of the Plexiglas about the size of a human nipple. I added heat to 250 degrees to outside of canopy pen pointing the area, but they did not go down.
Help
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11-01-2016, 03:15 PM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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it may be time for some Viagra
__________________
Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
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11-01-2016, 03:22 PM
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Join Date: Dec 2011
Location: Roanoke, Va
Posts: 36
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Quote:
Originally Posted by Steve Melton
it may be time for some Viagra
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Have some didn't help.
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11-01-2016, 03:38 PM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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leave it. take another look at it in a couple of years.
__________________
Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
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11-01-2016, 05:51 PM
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Join Date: Sep 2006
Location: Douglas Flat, CA
Posts: 589
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[partially off-topic]
It's been my experience that plexi does strange things when you heat it up on its own. One of the things I make is sliding windows for bubble canopies, and I've found that you can't just drape heated plexi over the form and expect it to take on the form's shape. Depending on whether the temperature ramp is going up or down, I've found that sometimes the plexi arches up away from the form. I'm pretty sure that this is due to uneven heating through the thickness of the material, but it might also be due to residual stresses from the original forming operation.
Anyhow, what I do is make an edge capture frame that pushes the heated plexi against the form around the perimeter of the shape, and hold it until it cools. That seems to do it.
__________________
Bob Kuykendall
HP-24 kit sailplane
EAA Technical Counselor
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11-01-2016, 07:41 PM
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Join Date: May 2010
Location: Baton Rouge, La.
Posts: 753
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That sucks!....I thought I was the only one that that happened to. I ended up replacing my entire canopy. 😏
Mark
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11-02-2016, 05:29 AM
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Join Date: Dec 2011
Location: Roanoke, Va
Posts: 36
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thanks, I think I will
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11-02-2016, 05:32 AM
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Join Date: Dec 2011
Location: Roanoke, Va
Posts: 36
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Your Idea is good. I had a concave mold done and used it in the inside after heating it. The shape took place but not completely.
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11-23-2016, 07:23 PM
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Join Date: Jan 2006
Location: Bakersfield, CA L45
Posts: 48
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[quote=Bob Kuykendall;1123530][partially off-topic]
It's been my experience that plexi does strange things when you heat it up on its own. One of the things I make is sliding windows for bubble canopies, and I've found that you can't just drape heated plexi over the form and expect it to take on the form's shape. Depending on whether the temperature ramp is going up or down, I've found that sometimes the plexi arches up away from the form. I'm pretty sure that this is due to uneven heating through the thickness of the material, but it might also be due to residual stresses from the original forming operation
Im interested in one of your windows for bubble canopy, I have an RV8A,
More info please
Thx
Al Dilger avdilger@yahoo.com
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