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MHerder
Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX
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 Posted: Wed May 20, 2009 4:26 am Post subject: Canopy Hardware Question |
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OK, so I decided not to use pop rivets to fasten the acrylic canopy to its frame. I've opted to use the alternate method that Zenith has provided, using a 5/16" hole in the canopy, a dimpled washer and a coarse thread screw. I used the exact numbers called for in the plans.
I drilled the holes in to the tube and through the acrylic using a #30. I have since found that a #30 is slightly too large to really grip the screw. I don't want part of my preflight to involve tightening all of my canopy screws, seems like I would be constantly be chasing these.
The reason I opted to use the 5/16" and screws was because using a pop rivet in a piece of plastic that cracks easily gives me the heebie jeebies. My thought is to use an A4 or A5 in lieu of the screw but through the washer, this would reduce any risk in cracking due to the expansion of the rivet and I wouldn't have to be constantly re tightening screws.
The screws I'm using are #6, so maybe going to a #8 would work, but I'm not sure that the head wouldn't be to big then to be fully recessed.
Your thoughts are appreciated.
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Zodiac 601 HD
Jabiru 3300
Wood Sensinich 64x47
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jaybannist(at)cs.com
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| Posted: Wed May 20, 2009 5:08 am Post subject: Canopy Hardware Question |
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Mike,
The problem is not expansion of fasteners. It is the acrylic that has the expansion and contraction that is greater than metal. You want it to be able to "float", so to speak, ir at least, to "wiggle" in relation to the frame and the fasteners. Just get flush head PK screws that fit tightly in the hole in the frame and loosely through the dished washer and the hole in the acrylic. Then don't screw them down tight to the acrylic.
Jay Bannister
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Gig Giacona
Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA
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| Posted: Wed May 20, 2009 5:15 am Post subject: Re: Canopy Hardware Question |
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If they aren't real loose you can try a dab of Lock-Tite on each screw.
Riveting the canopy can go badly real quick.
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W.R. "Gig" Giacona
601XL Under Construction
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Wed May 20, 2009 8:12 am Post subject: Canopy Hardware Question |
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I have never had a problem with my canopy screws coming loose in
nearly five years and 300 hours of flight time. If you drilled your
holes a bit too large, consider putting a dab of adhesive on the screw
threads when installing them, that should effectively lock them in
place.
On May 20, 2009, at 8:26 AM, MHerder wrote:
| Quote: |
OK, so I decided not to use pop rivets to fasten the acrylic canopy
to its frame. I've opted to use the alternate method that Zenith
has provided, using a 5/16" hole in the canopy, a dimpled washer and
a coarse thread screw. I used the exact numbers called for in the
plans.
I drilled the holes in to the tube and through the acrylic using a
#30. I have since found that a #30 is slightly too large to really
grip the screw. I don't want part of my preflight to involve
tightening all of my canopy screws, seems like I would be constantly
be chasing these.
|
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Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.
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N61BM, CH 601 XL, Stratus Subaru.
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ter_turn(at)yahoo.com
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| Posted: Wed May 20, 2009 8:43 am Post subject: Canopy Hardware Question |
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how about rivets designed for fiberglass, plastics. Larger surface area, lighter tension etc. To big and bulky?
do not archive
--- On Wed, 5/20/09, Gig Giacona <wrgiacona(at)gmail.com> wrote:
[quote]
From: Gig Giacona <wrgiacona(at)gmail.com>
Subject: Re: Canopy Hardware Question
To: zenith601-list(at)matronics.com
Date: Wednesday, May 20, 2009, 8:15 AM
--> Zenith601-List message posted by: "Gig Giacona" <[url=/mc/compose?to=wrgiacona(at)gmail.com]wrgiacona(at)gmail.com[/url]>
If they aren't real loose you can try a dab of Lock-Tite on each screw.
Riveting the canopy can go badly real quick.
--------
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=www.matronics.com/Navigator?Zenith601-List" target="_blank">http://www.ma - MATRONICS WEB FORUMS -
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[quote][b]
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Gig Giacona
Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA
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| Posted: Wed May 20, 2009 10:19 am Post subject: Re: Canopy Hardware Question |
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| ter_turn(at)yahoo.com wrote: | how about rivets designed for fiberglass, plastics. Larger surface area, lighter tension etc. To big and bulky?
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I have no idea. The thing is you may want to remove it at some point and the screws are the way to go in that case. Unless you just boarded out a way oversized bunch of holes the lock-tite ought to handle it. I'd suggest the Blue.
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601XL Under Construction
See my progress at www.peoamerica.net/N601WR |
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