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02-27-2020, 07:32 AM
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Join Date: Oct 2005
Location: Melbourne, Australia
Posts: 1,865
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It's surely interesting that so many canopies bonded on with Sikaflex have developed serious cracks.
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You’re only as good as your last landing 
Bob Barrow
RV7A
Last edited by Captain Avgas : 02-27-2020 at 07:35 AM.
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02-27-2020, 07:46 AM
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Join Date: Oct 2009
Location: Victoria, BC, Canada
Posts: 3,926
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Quote:
Originally Posted by Captain Avgas
It's surely interesting that so many canopies bonded on with Sikaflex have developed serious cracks.
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It's interesting that so many screwed on canopies have developed them as well.
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Rob Prior
1996 RV-6 "Tweety" C-FRBP (formerly N196RV)
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02-27-2020, 07:59 AM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,787
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oversize the holes and screw it on so it floats and has room to expand may be one method to eliminate cracks.
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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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02-27-2020, 09:03 AM
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Join Date: Apr 2009
Location: Stockton, California
Posts: 294
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Compae the coefficient of expansion of the plexi with the aluminum (IIRC it's a factor greater than 3) It gets significant as the edge of the canopy grows in length.
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02-27-2020, 09:59 AM
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Join Date: Jan 2015
Location: Jamestown,NY
Posts: 629
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Too bad someone couldn't come up with a canopy material that was crack proof!
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9A in progress
Working on Finish kit!!
Mattituck TMXIO-360 red gold
Dues paid Jan 2020
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02-27-2020, 10:35 AM
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Join Date: Dec 2009
Location: Montreal
Posts: 1,456
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That's a nice repair. Too bad there isn't a similar product that is transparent. Or is there? There is a guy near Montreal here with a 4 who has had to replace his canopy several times. Big temperature variations up here between winter and summer and his hangar is not heated.
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Scott Black
Old school simple VFR RV 4, O-320, wood prop, MGL iEfis Lite
VAF dues 2020
Instagram @sblack2154
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02-27-2020, 10:39 AM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,787
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Quote:
Originally Posted by Marc Bourget
Compae the coefficient of expansion of the plexi with the aluminum (IIRC it's a factor greater than 3) It gets significant as the edge of the canopy grows in length.
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yes, by analysis, if you connect two dissimilar pieces and then apply a temperature delta, the max stress is in the middle. exactly where this canopy cracked.
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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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02-27-2020, 10:43 AM
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Join Date: Jan 2005
Location: Irvine, CA
Posts: 871
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Scott Chastain, please check your private messages!
Thanks,
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Mark
RV-12iS Fuselage
RV-9A Project: Sold
VAF donation made for 2020
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02-27-2020, 03:56 PM
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Join Date: Mar 2005
Location: SE Florida
Posts: 1,499
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Sport Aviation Plexi Repair Article
Recently, I've been editing articles from old copies of Kitplanes and Sport Aviation. The November 2007 issue of Sport Aviation has a great article regarding a major Plexi repair. It was on the top turret for a B 25. Repair came out very well, with good optics. The article author is Scott Bixler. Article starts on page 100. Check it out.
Charlie
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02-27-2020, 08:38 PM
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Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 2,641
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Quote:
Originally Posted by dwranda
Too bad someone couldn't come up with a canopy material that was crack proof!
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That would be great until you are upside down and trying to get out. It is a pain to change the canopy, but not that bad once you just dive in and do it.
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rockwoodrv9a
Williamston MI
O-320 D2A
Awaiting DAR Inspection
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