VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-10
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #11  
Old 03-01-2018, 07:23 AM
9GT's Avatar
9GT 9GT is offline
 
Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,465
Default

One of the common links to the crazing problem is the use of Weldon. I realized this early on when I joined this forum and started reading all the posts about it. No way would I go near the stuff building my RV-10. When I had my C-152, I replaced all the transparencies and had to fabricate and install a thick plexi mounting block for the compass. I used Weldon to glue the block to the windscreen and within a couple months crazing started to develop under the mounting block. Sickening to see all my hard work and money I spent for the new windscreen being slowly blemished by a glue! When I was in the Canard camp, the Rutan method of bedding the transparencies in thick epoxy/flox mix, then topping with a couple layers of BID tape was the standard installation process. I never read a report of this leading to crazing, and the Cozy MKIV transparencies look as good today as the day we installed them almost 15 years ago. That's how I installed the transparencies in my RV-10, and I am confident the the new owner will never need to replace them for crazing reasons.
__________________
David C.
Howell, MI

RV-9A: Under Construction. N161RV (Reserved)
RV-10: N959RV Completed 12/29/2013 SOLD 08/23/2016

"Donor Exempt" but donated through Dec. 2018

Last edited by 9GT : 03-01-2018 at 07:25 AM.
Reply With Quote
  #12  
Old 03-01-2018, 08:32 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,719
Default

The only instances of crazing I have seen with the use of Weldon was when localized pressure was induced by the use of clamps.

Weldon was originally chosen, not because it was the only thing that would work, but because that is what Lancair used on the ES and 4P at the time.

It was assumed that if it was good enough for a pressurized aircraft it would be good for the RV-10.

Static load tests of the cabin top proved that the strong bond produced by the Weldon provided structural benefits for cabin integrity (further evidenced by the need for a router to remove a wind screen or side window).
__________________
Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
Reply With Quote
  #13  
Old 03-01-2018, 10:44 AM
9GT's Avatar
9GT 9GT is offline
 
Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,465
Default

Quote:
Originally Posted by rvbuilder2002 View Post
The only instances of crazing I have seen with the use of Weldon was when localized pressure was induced by the use of clamps.

Weldon was originally chosen, not because it was the only thing that would work, but because that is what Lancair used on the ES and 4P at the time.

It was assumed that if it was good enough for a pressurized aircraft it would be good for the RV-10.

Static load tests of the cabin top proved that the strong bond produced by the Weldon provided structural benefits for cabin integrity (further evidenced by the need for a router to remove a wind screen or side window).
No clamps or anything when I glued the two plexi pieces together yet it still crazed. Any ideas why?
__________________
David C.
Howell, MI

RV-9A: Under Construction. N161RV (Reserved)
RV-10: N959RV Completed 12/29/2013 SOLD 08/23/2016

"Donor Exempt" but donated through Dec. 2018
Reply With Quote
  #14  
Old 03-01-2018, 11:00 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,719
Default

Quote:
Originally Posted by 9GT View Post
No clamps or anything when I glued the two plexi pieces together yet it still crazed. Any ideas why?
No
Other than maybe the FAA has more influence than we could ever imagine, when changes are made to Certificated aircraft, that weren't part of the original type certificate?
__________________
Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
Reply With Quote
  #15  
Old 03-01-2018, 12:57 PM
Canadian_JOY Canadian_JOY is offline
 
Join Date: Aug 2007
Location: Ontario, Canada
Posts: 1,734
Default

For a good tutorial on how to install windshields using Silpruf sealant, a product similar to Sikaflex, go to youtube and search on "Glastar windshield installation". There is a series of videos on this topic, narrated by Zach Chase of Fibertech Composites of Stuart, Florida. He's a master of the technique.

By the way, this technique has been used on many Glasair aircraft, including the low-wing Glasairs, Glastars and the Sportsman. So far there has been one reported failure of the adhesive bond, and that failure has been attributed (by the aircraft builder himself) to the use of Silpruf which was within the last few days of its shelf life.
Reply With Quote
  #16  
Old 03-01-2018, 03:33 PM
9GT's Avatar
9GT 9GT is offline
 
Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,465
Default

Quote:
Originally Posted by rvbuilder2002 View Post
No
Other than maybe the FAA has more influence than we could ever imagine, when changes are made to Certificated aircraft, that weren't part of the original type certificate?
Actually these were type certificated parts and the Weldon was specified and supplied by the manufacturer of the windscreen for installing the compass mount that came with it. I just needed to modify the compass mount taht was supplied by the mfg. because it required a bit of modification to fit the really cool SIRS mounting holes pattern. The mount did not craze, just the windscreen. The crazing started under the mount/glue location and slowly spread to about an inch beyond the mount. One of the common denominators of crazing is the use of Weldon. May or may not be builder/application error but I wouldn't touch that stuff again with a 10' pole after my experience. And I followed manufacturers instructions to the letter.
__________________
David C.
Howell, MI

RV-9A: Under Construction. N161RV (Reserved)
RV-10: N959RV Completed 12/29/2013 SOLD 08/23/2016

"Donor Exempt" but donated through Dec. 2018
Reply With Quote
  #17  
Old 03-04-2018, 03:40 PM
Freightdawg's Avatar
Freightdawg Freightdawg is offline
 
Join Date: Apr 2013
Location: New Albany, IN
Posts: 151
Default

Quote:
Originally Posted by vic syracuse View Post
Carol said she wouldn't go to Alaska with me this summer unless I replaced it. Too much beautiful scenery to miss.
I hope you'll be sharing a complete trip report with the rest of us(?)
__________________
Jeff Rich
RV-10 Kind of all over the place in the plans. Need to get out to the airport.
N313KC reserved
In the garage for now, KJVY this summer...this fall...whenever they finish building the hangar
Reply With Quote
  #18  
Old 03-05-2018, 08:06 AM
dmaib's Avatar
dmaib dmaib is offline
 
Join Date: Jan 2006
Location: New Smyrna Beach, FL
Posts: 1,322
Default

Nine years (installed mid-2008) and 1050 hours and my windscreen still looks pretty much like new. Used Weldon and followed Vans instructions very carefully. Plexus has been used almost exclusively for cleaning.
__________________
David Maib
RV-10 N380DM
New Smyrna Beach, FL
VAF Paid 1/10/2018

"In '69 I was 21, and I called the road my own"
Jackson Browne






Last edited by dmaib : 03-05-2018 at 08:08 AM.
Reply With Quote
  #19  
Old 03-05-2018, 05:32 PM
greghale greghale is offline
 
Join Date: Jan 2006
Location: TULSA, OK
Posts: 51
Default windshield replacement

I had to replace mine. I have the process I used on my web site.
http://www.nwacaptain.com/windshield.html

Hope this helps.
Reply With Quote
  #20  
Old 03-05-2018, 06:51 PM
carolsyracuse carolsyracuse is offline
 
Join Date: Oct 2006
Location: locust grove, ga
Posts: 114
Default possible cause of crazing

We contacted LP Aero plastics regarding the crazing on our RV10 windshield. They said the cause was the use of automobile reflective inserts on the inside of the plexiglass. They said there is a chemical reaction from the materials in the sunshields that causes the crazing.

Even Bruce's custom cover's does not recommend the use of their internal sun shields for more than a couple of hours at a time..."We would only recommend using sun shields 'HeatShields' for temporary use during day trips or for a couple of hours at a time during a short layover. If used too frequently over time, the silver reflective surface can cause damage to your Plexiglas windscreen and laminated windshields as it traps heat in between your glass and the HeatShield."
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 08:44 AM.


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.