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  #1  
Old 10-16-2011, 09:54 PM
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Ironflight Ironflight is offline
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Default RV-3: F-1 Style Fuel Tank Vents

Here?s a quick picture of the vents we are going to try on the RV-3 project. Instead of running the vent lines into the cockpit and up (then back down) the sidewalls, we decided to give the F-1 Rocket ?coiled vent tube? a try. Pretty simple to execute, and I have heard of no reported problems for the Rocket guys with this design.



We?ll let folks know how it works once we have some flight experience with it!

Paul
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  #2  
Old 10-16-2011, 10:40 PM
Paul Thomas Paul Thomas is offline
 
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That's what I'm planning to do on my -7, although I'm not planning on the vent extending that far.
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  #3  
Old 10-16-2011, 10:42 PM
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Ironflight Ironflight is offline
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Quote:
Originally Posted by Paul Thomas View Post
That's what I'm planning to do on my -7, although I'm not planning on the vent extending that far.

I did puzle a bit over how long I wanted the vent, and in the end, copied the ones on my RV-8. We can always cut them down or replace them with somehtign fancier in teh future!
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  #4  
Old 10-16-2011, 10:54 PM
molson309 molson309 is offline
 
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I have these on my F1. For what it's worth, the only negative I have found is that I cannot fill the tanks to the brim or an impressive amount will vent when the fuel expands due to temperature changes. I can also notice a fuel smell when leveling off after a climb when the tanks are near full. Burn a little off, however, and this all goes away. My RV, which has the Van's standard vent arrangement (the loop inside the fuselage with its apex high above the wing) will also spurt fuel when full, but not to the same extent as my F1.

Mark Olson RV-7A F1-EVO Rocket
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  #5  
Old 10-16-2011, 11:06 PM
Paul Thomas Paul Thomas is offline
 
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How many loops do you have in your vent line Mark?
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Old 10-16-2011, 11:23 PM
molson309 molson309 is offline
 
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I used 2 loops, similar to the picture above. I read on one of the Rocket Forum threads that this tended to minimize fuel venting, especially in turbulence.
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  #7  
Old 10-17-2011, 12:57 AM
Paul Thomas Paul Thomas is offline
 
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I have heard that 3 loop would help prevent some of the issues you've mentioned, but I'd imagine that those cases are rare as the added volume from the third loop is minimal. I'm going to use two loops.
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  #8  
Old 10-17-2011, 06:25 AM
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f1rocket f1rocket is offline
 
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You need to add these!



You can find them here: http://www.aircraftextras.com/
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  #9  
Old 10-17-2011, 07:30 AM
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Ironflight Ironflight is offline
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I looked at (drooled over) some of the cool vents like those Randy, but alas...the tank flange is just too narrow to comfortably drill holes for the AN fittings. And down here where the mud-dauber's live, it's nice to have a tube over which to slip a cover!

Those things are pretty neat though....
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RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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  #10  
Old 10-18-2011, 09:05 AM
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swisseagle swisseagle is offline
 
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Default Where is the open end in the fueltank?

Hello

I just remember this, the Vans serie of planes are designed as tailwheel plane. So the tube ends in the fueltank in front of the filler opening. This is the highest spot when the tailwheel is on the bottom.

If you build a nosewheel, then the highest spot is closer to the spar. If you fill a A-Version up really full, then the tube opening is underneath the fuellevel.
If you put the plane into the sun, then the air in the tank expands and push out quite an amount of fuel!

Really look where the opening is, otherwise do not fill higher than the opening.

Regards, Dominik
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