VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.


Go Back   VAF Forums > Main > RV General Discussion/News
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 10-24-2012, 02:47 AM
skyyking skyyking is offline
 
Join Date: Dec 2005
Location: Kenosha WI
Posts: 52
Default Canopy cracking when pulling rivets

Folks, I am worried when I go to pull the AACQ-4-4 rivets on the canopy frame it will crack the canopy. As you are aware, you can't control the pressure. I need to ask therefore; if any of you out there have had any problems, especially on the forward portion of the canopy frame where the rivet makes direct contact with the plexi.

Thanks!
Reply With Quote
  #2  
Old 10-24-2012, 02:55 AM
lucaperazzolli's Avatar
lucaperazzolli lucaperazzolli is offline
 
Join Date: Sep 2006
Location: Trento, northern Italy
Posts: 641
Default

clean everything, deep breath, HOT plexy canopy, slightly deburr holes, run slowly, everythings will go !

Warm the canopy !!!!

2c
__________________
Luke
Trento, northern Italy
RV-8 QuickBuild, Catto 3 blade Prop, YO-360-A1A. Status : I-LUKE is Flying - 400 h. and counting
http://www.rv8.it

CrewRV8 team leader

https://youtu.be/VhAkhuqZMQA

https://www.youtube.com/watch?v=he9AFHRO1OY

=VAF= 2021
Reply With Quote
  #3  
Old 10-24-2012, 03:10 AM
Andy Hill's Avatar
Andy Hill Andy Hill is offline
 
Join Date: Dec 2005
Posts: 978
Default

I hear that the rivets crack the canopy when:
  • You don't use the correct rivets (which are particularly "soft")
  • They are "old" (=hardened)
When we did ours, had no issue, avoiding above. Of course, you will have plenty of spare plexi and AL, so do some practice with some spare riverts if you are not confident

As Luke says, "slightly deburr" holes. We went one further and used fine sandpaper to polish the holes such that the "countersink" corners were all smooth...
__________________
Andy
Reply With Quote
  #4  
Old 10-24-2012, 07:59 AM
aerovin aerovin is offline
 
Join Date: Nov 2007
Location: Lincoln, CA
Posts: 138
Default

I just did all those on my RV-8 canopy. OAT about 90 degrees. No problem and after I did a few I could anticipate when the rivet would pull and held the puller accordingly.
__________________
Scott Thompson
RV-8 N9324Z (flying as of 8/30/15)
http://www.aerovintage.com/rv8/rv8-index.htm
Reply With Quote
  #5  
Old 10-24-2012, 08:25 AM
MarkW's Avatar
MarkW MarkW is offline
 
Join Date: Sep 2011
Location: Edgewater, FL. X50
Posts: 1,177
Default

Like Andy says. You will find that the recommended rivets require very little pull pressure. It therefore puts little pressure on the plexi.
__________________
Mark
RV9 - N14MW - Flying
G3X - ECI Titan I0-320
Catto three blade prop
http://www.mykitlog.com/MarkW

Last edited by MarkW : 10-24-2012 at 08:34 AM. Reason: mis-spelling
Reply With Quote
  #6  
Old 10-24-2012, 11:28 AM
flyboy1963's Avatar
flyboy1963 flyboy1963 is offline
 
Join Date: Oct 2008
Location: Lake Country, B.C. Canada
Posts: 2,434
Default WHY does it crack?

The times I've pop-rivetted plexi, a crack occurred when the rivet flared in the hole, not from the actual pulling together of the plexi to the support.
that said, be sure they are in TIGHT contact, and if you have used a washer or shim of any kind, ensure the rivet length is correct so it flares in the tube, not in the washer, or you get a false 'pull', and it may come out later.

all the comments on the warm or hot plexi, deburring and fresh rivets I'm sure are valid....remove any stress points.
I'd be concerned if the canopy were 5 or 10 years old also, as it hardens with age, or if stored in light or at hi temps, the moisture and/or plastic resins leach out in some way. ( IMO)
__________________
Perry Y.
RV-9a - SOLD!....
Lake Country, BC
Reply With Quote
  #7  
Old 10-25-2012, 09:39 AM
12vaitor 12vaitor is offline
 
Join Date: Aug 2012
Location: Panama City, FL
Posts: 198
Default

I also did the sandpaper polish after countersinking the holes. I also wet set all of the rivets with proseal before pulling them. All work was done in 90+ temps, so hopefully the future cracking potential is low.
Reply With Quote
  #8  
Old 10-25-2012, 10:24 AM
Mel's Avatar
Mel Mel is offline
 
Join Date: Mar 2005
Location: Dallas area
Posts: 11,224
Default

As others have said, first make sure you use the correct rivets.
They should be aluminum!
Use a hand puller, NOT a pneumatic puller. That way you CAN more easily control the pressure.
I've done many and have never had a problem.
__________________
Mel Asberry, DAR since the last century. Over 1,000 certifications accomplished. Discount for Veterans, Law Enforcement, Fire Fighters.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
Reply With Quote
  #9  
Old 10-25-2012, 11:48 AM
jimbower jimbower is offline
 
Join Date: Aug 2006
Location: St. Louis, MO
Posts: 162
Default

I know this is not about rivets, but I used no rivets in my canopy...everything is #6 screws, no cracks.

Jim Bower
St. Louis
RV-6A (flying)
Reply With Quote
  #10  
Old 10-25-2012, 12:30 PM
rvpilot's Avatar
rvpilot rvpilot is offline
 
Join Date: Jan 2005
Posts: 342
Default Could go rivetless....

And glue it! No holes to drill, no rivets to pull.
Plenty on the forums about this!
__________________
Bill Waters
Based KCVC (Covington, GA)
RV6A - Gone, but not forgotten!
RV8 - Gone too, now winning races in the RV Gold Class!
RV4 - Flying!!!
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 08:06 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.