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01-14-2014, 08:50 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by sonny-m
I am just wondering what is actually causing the crazing. Could it be that nasty corn stuff they put in auto fuel that the rear window doesn't like.
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Yes. That seems to be the primary problem.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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01-14-2014, 09:02 PM
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Join Date: Dec 2011
Location: Georgetown, Texas
Posts: 184
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Nasty corn stuff and Proseal
Scott, I think I've picked up somewhere that the ethanol in our fuel attacks Pro Seal. Any evidence of that? Hope not.
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Dick Gossen
gossend@gmail.com
Flying: EAB RV-12 with Aeromomentum AM15-HP engine
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01-14-2014, 10:53 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by gossend
Scott, I think I've picked up somewhere that the ethanol in our fuel attacks Pro Seal. Any evidence of that? Hope not.
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Not that it does, but it can. but is dependent on numerous factors.
It has been discussed here in the forum previously. The most critical factor is time. Do not let ethanol fuel sit in the tank during periods of extended storage.
Van's official position was published in Sevice Bulliten 13-3-21 located HERE
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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01-15-2014, 07:51 AM
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Join Date: Mar 2010
Location: Raleigh, NC
Posts: 863
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Quote:
Originally Posted by rvbuilder2002
Not that it does, but it can. but is dependent on numerous factors.
It has been discussed here in the forum previously. The most critical factor is time. Do not let ethanol fuel sit in the tank during periods of extended storage.
Van's official position was published in Sevice Bulliten 13-3-21 located HERE
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Sevice Bulletin: typo or Freudian slip? 
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01-15-2014, 10:44 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by WingedFrog
Sevice Bulletin: typo or Freudian slip? 
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You guys hold me to a pretty high standard (perfection?), don't you?
Just click on the link... it should make it clear enough... 
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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01-15-2014, 01:24 PM
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Join Date: Jan 2006
Posts: 905
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Scott, I am not trying to give you a hard time as I really appreciate all you do for us. Following your comment on expansion I was curious so checked it out. If one filled to a full 19.8 gal AND there was a 15 degree C increase in temp after the tank fuel would expand to 36 oz more and overflow a little at the fill neck. So you are correct when those circumstances occur. I normally shoot for 18 to 19 gal as I don't like overflows, and even with a big bump in temp. after the fill no problem. However I never before appreciated the role played by temp increases in the equation. Food for thought.
Dick Seiders
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01-15-2014, 03:19 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by dick seiders
Scott, I am not trying to give you a hard time as I really appreciate all you do for us. Following your comment on expansion I was curious so checked it out. If one filled to a full 19.8 gal AND there was a 15 degree C increase in temp after the tank fuel would expand to 36 oz more and overflow a little at the fill neck. So you are correct when those circumstances occur. I normally shoot for 18 to 19 gal as I don't like overflows, and even with a big bump in temp. after the fill no problem. However I never before appreciated the role played by temp increases in the equation. Food for thought.
Dick Seiders
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It is not uncommon for even more temp change than that... cold fuel pumped from an under ground tank in the morning, and then the airplane sits in the sun all day at a fly-in. Couple that with a situation where the tank was 100% topped off (either accidently, or on purpose, for departure on a long cross country leg towards home) and it is very easy to have happen.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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01-25-2014, 10:14 PM
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Join Date: Oct 2008
Location: Napa, Calif
Posts: 274
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I was wondering why the fuel vent has an air line as well as the vent line? I will be installing it soon, but was curious why the second line. I don't mean this to sound like a criticism of the engineering. I just like to know as much as I can about my airplane and how and why it works. Anyone have an answer? Thanks.
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01-26-2014, 05:14 AM
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Join Date: May 2008
Location: Friday Harbor, Wa
Posts: 300
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The second smaller line is a siphon breaker(preventer)
__________________
MRT890
120042 RV-12
N112XP
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01-26-2014, 08:45 AM
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Join Date: Aug 2008
Location: Texas, Fort Worth
Posts: 1,237
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Quote:
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The second smaller line is a siphon breaker(preventer)
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To add just a little bit more. Consider you are going on a long x-country and you fill the tank all the way up to the top of your filler neck then your fuel would be higher than the vent hose so a siphon could occur. 
__________________
John
RV12 N1212K
Flying Since June 2010
1020 Hours as of 9/30/2017
Johnrv12@icloud.com
RV14 Wing, arrived and building at Rdog's new Hanger at 16X
S/N 140014
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