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  #1  
Old 08-13-2022, 05:58 PM
yeogene yeogene is offline
 
Join Date: Aug 2022
Location: Astor, Fl
Posts: 1
Default RV12 rear window spider cracked

Hello from a new to the forum and a almost RV12 owner. I stopped flying in 1993 as a PPSEL working on my instrument rating. Now retired and able to fly again as a Rec pilot in a eLSA and was lucky enough to fly a RV12 before I bought a plane kit.

Anyhow, I am in the process of buying is low hour bird that has the back window spider web cracked above the fuel filter. Builder tells me it is from fuel splashing and is common.

Is it common?

Is it a concern other than looking bad?

If I purchase a new piece from Vans is it a direct fit?

This plane does not have Nav lights, I like them for the safety component.

If I but the nav only light from Vans does that include the fiberglass and mounting brackets as well.

Is there a more cost effective option?

Plane is in the local Rotax certified shop right now getting a 100 hour inspection and ADSB in out installed and should be done soon.

Thank you in advance for your thoughts
Gene
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  #2  
Old 08-13-2022, 06:28 PM
cactusman's Avatar
cactusman cactusman is offline
 
Join Date: Oct 2012
Posts: 549
Default

I would say that everyone is gonna have to replace their original Lexan rear window unless they keep it in a perfect climate controlled hangar.

I just replaced mine with the form fitting plexiglass one. No problems at all.

The new one works much better.
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John
RV12 Built and Flying
RV10 Started
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  #3  
Old 08-13-2022, 06:58 PM
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DaleB DaleB is offline
 
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,361
Default

Quote:
Originally Posted by yeogene View Post
Is it common?
Yes, fairly common. Gasoline hitting the drilled or cut edges of the polycarbonate window causes it.

Quote:
Is it a concern other than looking bad?
Not that I know of. It's not going to get any better, though.

Quote:
If I purchase a new piece from Vans is it a direct fit?
Yep. I installed the pre-molded acrylic replacement, it's great. You will need to drill it, unless you go off-script like I did and put it in with Sikaflex. I don't know if they still sell the flat polycarbonate rear window, but do yourself a favor and just don't.

Quote:
If I but the nav only light from Vans does that include the fiberglass and mounting brackets as well.
Call and ask them...

Quote:
Is there a more cost effective option?
Yep. I installed Kuntzelman nav lights on mine, after installing the Van's fiberglass wingtip fairings. Everythign works fine, but it was a lot of work. Were I to do it again I'd probably buy the kit from Van's.
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Dale

Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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  #4  
Old 08-13-2022, 07:36 PM
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Mike S Mike S is offline
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 16,498
Default Welcome to VAF

Quote:
Originally Posted by yeogene View Post
Hello from a new to the forum ----------

Thank you in advance for your thoughts
Gene
Gene, welcome aboard the good ship VAF
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Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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  #5  
Old 08-13-2022, 09:43 PM
12vaitor 12vaitor is offline
 
Join Date: Aug 2012
Location: Panama City, FL
Posts: 237
Default

You may want to download the updated RV-12 Section 40 KAI on Van's web site to see what is involved with installing the lighting kit.

If the original builder did not include the wiring for the lights through the ribs, you will have to fish the wires. Depending on how old the kit was, you may want to also upgrade the wing electrical connectors to newer AMP style self-aligning connectors. The strobes can induce noise in the headset audio if you do not install the noise filtering capacitors.

Last, it you want a white position light on the tail you are pretty much on your own to come up with a solution. I put mine on the fiberglass cap that goes on the VS. I think Van did something similar on his personal RV-12.

John Salak
RV-12 N896HS
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  #6  
Old 08-14-2022, 08:20 AM
mdoyle mdoyle is offline
 
Join Date: Jun 2005
Location: Xenia, OH
Posts: 166
Default Vanís lighting kit

I used Vanís lighting kit to install lights on my legacy RV 12. I highly recommend them. I also installed the new style wing electrical connectors.
This is pretty time consuming, and you will be cutting holes in your wings for the landing light and the strobe/navigation lights.
I also installed the plexiglass rear window, not a big job, but you will be trimming the center rear of the window to clear a brace.
Vanís instructions for all of these are very good, you just need to follow the closely.
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RV-12
RV-9A, Under Construction
Xenia, OH 45385
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  #7  
Old 08-14-2022, 09:59 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,320
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I changed out my rear window after 4 years due to crazing and went to the new molded version. Six years later, no issues.
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  #8  
Old 08-14-2022, 10:56 PM
pilotyoung pilotyoung is offline
 
Join Date: Jan 2018
Location: Birmingham, AL
Posts: 263
Default RV-12 rear window spider cracked

Mine developed these spider cracks about 4 years ago. I have not changed it yet as I don't think it is an air worthy item. But I will change it one of these days.

I think it is a common problem from fueling.
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John D. Young, RV-12 Owner
Serial Number 120022, N6812Y
Bought it as a flying airplane in Feb. 2018
Just passed 300 hours flight time in RV-12, and 10,000 hours mostly in corporate jets. I am a CFI; CFII; MEI; and a Advanced Ground Instructor, CFIG; and hoping to be able to help new RV-12 owners by doing some transition training for new builders and owners in RV-12's.
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  #9  
Old 08-15-2022, 07:47 AM
John-G John-G is offline
 
Join Date: Jan 2012
Location: Northeast Ohio
Posts: 772
Default

The crazing will happen eventually anyway .... fuel just makes it happen quickly.

My RV-12 has always been kept in a hangar and has never been parked outside, except for the occasional fly to a restaurant for a breakfast or burger & fries outing.

The rear window has never been cleaned with any kind of chemical cleaner and I hand fuel using a Mr Funnel ... have never spilled a drop of fuel.

If the light is right, one can easily see the signs of crazing beginning where the Lexan makes the bends to meet with the sides of the fuselage. I seemingly have no surface cracks yet ... but the stress marks are clearly visible.
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http://www.dogaviation.com/

RV-12 Wings, Empennage, Fuselage, Finishing, Avionics and Powerplant kits all completed
Now Flying!!

Donation paid until September 2023
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  #10  
Old 08-15-2022, 10:16 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,320
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The bending of the flat lexan into a curve puts a lot of stress on it which probably makes crazing inevitable as John says. Thatís why I wanted the molded window to avoid at least that contributor.
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