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  #11  
Old 10-21-2019, 06:39 AM
sailvi767 sailvi767 is offline
 
Join Date: Sep 2010
Location: Charlotte NC
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I wish I had talent to design things like this!
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  #12  
Old 10-21-2019, 08:42 AM
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Snowflake Snowflake is online now
 
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This looks like a really good solution, but i'm wondering how you make the trapezoidal hole and the two holes on either side of it without dropping aluminum shavings into the fuel tank...
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1996 RV-6 "Tweety" C-FRBP (formerly N196RV)
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  #13  
Old 10-21-2019, 11:57 AM
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Bill Boyd Bill Boyd is offline
 
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Default We'll have to wait for the video.

But I don't personally think aluminum dust from a carbide burr would be anything my fuel filter element (or sump drain) couldn't safely handle in the expected amounts.
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Bill Boyd

Hop-Along Aerodrome (12VA)
RV-6A - N30YD - flying since '98
RV-10 - N130YD reserved - under construction

donating monthly to the VAF - thanks, Doug
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  #14  
Old 10-21-2019, 12:05 PM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
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Default I used...

I used these and they worked great...

http://hotelwhiskeyaviation.com/fuel-bung-kits
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Bob
Aerospace Engineer '88

RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...

Dues Paid 2018,...Thanks DR+
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  #15  
Old 10-21-2019, 01:13 PM
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Hartstoc Hartstoc is offline
 
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Location: Sebastopol,CA
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Quote:
Originally Posted by emsvitil View Post
What am I missing....

Why won't the AN thru-bolt back out?
Well, two reasons. First, the O-rings are substantially compressed, so act much like a spring washer to greatly increase breakout force required to loosen it. Second, the fuel line secured via the flair fitting would lock the assembly. If any concern remains, it would be very easy to drill the hex head and a meaty section of the outer flange for safety wiring it, so ultimately this will not present a problem.

Thanks for the question!- Otis
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Otis Holt-
RV-7A (bought)
Built Monnett Moni
Frmr Test Pilot/Author CAFE APR's:
RV-8A, S-7C, Europa, Glastar.
-2019 VAF donation!!-
"RV-Fun is inversely proportional to RV-Weight!"
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  #16  
Old 10-21-2019, 01:15 PM
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Hartstoc Hartstoc is offline
 
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Quote:
Originally Posted by Darin Watson View Post
This does look like an excellent solution to return line retrofit, or as noted service of the finger stainer.

If I were you I would consider partnering (i.e. license out your design for a small "royalty") to Aircraft Extras, Anti-Splat, JD Air Parts or other reputable 3rd party.
Thanks for the kind words. My hope is to do exactly as you suggest, and I appreciate the list of candidates.- Otis
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Otis Holt-
RV-7A (bought)
Built Monnett Moni
Frmr Test Pilot/Author CAFE APR's:
RV-8A, S-7C, Europa, Glastar.
-2019 VAF donation!!-
"RV-Fun is inversely proportional to RV-Weight!"
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  #17  
Old 10-21-2019, 01:22 PM
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Hartstoc Hartstoc is offline
 
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Quote:
Originally Posted by maniago View Post
Good job Otis! Awesome for blind access.

FWIW, I used a Stat-o-seal, $5; tho I had access to fish the inside nut thru the tank neck, and get a rachet wrench with extension on to the nut to hold it. Depending on how your edges are formed, a hole near enough to the tank edge could be used as a flat for said inside nut..... Doesnt take much to squeeze the seal.

https://www.speedwaymotors.com/Goodr...-AN,34188.html

Dowty seals are a similar tech, tho typically used in a threaded hole application, similar to how an ORB fitting works.
Thanks- I understand that Ross Farnhamís EFI customers have had good luck with the Stat-O-seal, bit access to the tank interior is required for this, and Iím also a bit concerned about its small area transmitting damaging vibratory stresses to the tank wall in some situations, possibly leading to a tank rupture. -Otis
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Otis Holt-
RV-7A (bought)
Built Monnett Moni
Frmr Test Pilot/Author CAFE APR's:
RV-8A, S-7C, Europa, Glastar.
-2019 VAF donation!!-
"RV-Fun is inversely proportional to RV-Weight!"
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  #18  
Old 10-21-2019, 01:25 PM
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Hartstoc Hartstoc is offline
 
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Quote:
Originally Posted by Snowflake View Post
This looks like a really good solution, but i'm wondering how you make the trapezoidal hole and the two holes on either side of it without dropping aluminum shavings into the fuel tank...
Iíll be following up on this in due course. I do have a good method that I will be sharing. Right now my time is very limited due to fire damage to one of my buildings. Really quite easy to do with a little care, though.- Otis
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Otis Holt-
RV-7A (bought)
Built Monnett Moni
Frmr Test Pilot/Author CAFE APR's:
RV-8A, S-7C, Europa, Glastar.
-2019 VAF donation!!-
"RV-Fun is inversely proportional to RV-Weight!"
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  #19  
Old 10-21-2019, 01:35 PM
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Hartstoc Hartstoc is offline
 
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Quote:
Originally Posted by rocketman1988 View Post
I used these and they worked great...

http://hotelwhiskeyaviation.com/fuel-bung-kits
My earliest designs were along these lines, with a chopped ring inserted to reinforce the backside of the tank skin. In the end, the installation is much more difficult and involves a lot of messy pro-seal, cure time, etc. I like that my unit can easily be disassembled at any time, and that it traps the tank wall so securely. Certainly no flange should ever be attached to the external tank tall without appropriate reinforcement from the inside.- Otis
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Otis Holt-
RV-7A (bought)
Built Monnett Moni
Frmr Test Pilot/Author CAFE APR's:
RV-8A, S-7C, Europa, Glastar.
-2019 VAF donation!!-
"RV-Fun is inversely proportional to RV-Weight!"
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  #20  
Old 10-21-2019, 01:44 PM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
Posts: 1,765
Default Well...

"...Certainly no flange should ever be attached to the external tank tall without appropriate reinforcement from the inside..."

Well, I guess we will see...

There are a bunch of ER tanks out there flying and I have yet to hear of anyone complaining about lack of "an appropriate reinforcement from the inside".

I do like your idea though...I would have been all in...four years ago. ;>}
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Bob
Aerospace Engineer '88

RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...

Dues Paid 2018,...Thanks DR+
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