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Old 09-24-2021, 09:20 AM
Freemasm Freemasm is offline
Join Date: Nov 2017
Location: Orlando
Posts: 482
Default Tank vents

RV style vents versus the single or double loop wing root Rocket vents.

Not picturing it. Can you fill the tanks configured with the Rocket wing root vents without having the tanks siphon to below the vent pick-up? Just learn to live without completely filling the tanks?

What is the Rocket community experience?

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Old 09-24-2021, 10:44 AM
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Jpm757 Jpm757 is offline
Join Date: May 2013
Location: Sherman, CT
Posts: 984

I am using the rocket style "loops" on my -7 and have had no issues. They exit the bottom wing fairing via a bulkhead fitting and JD Air fuel vents. No siphoning whatsoever.
RV6 #20477 completed 1991 sold.
RV7 #72018 N767T first flight 11/21/2017
(KOXC)Oxford, CT, (0NY0)North Creek, NY.
1941 J3 Cub skis, floats.
Building Javron Super Cub.
2020 dues gladly paid.
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Old 09-24-2021, 10:53 AM
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9GT 9GT is offline
Join Date: Jan 2010
Location: Southern Michigan
Posts: 2,154

The RV-10 has the vent line come out of it the tank a couple inches and a 90* bend down and straight out. No loops or bizarre cabin entry. I think one thing of most importance is to get the vent line opening in the tank turned up and as close to the top of the tank skin as possible leaving enough clearance to vent without siphoning off gas from a filled tank. I left about 1/16Ē clearance on mine. I removed the interior vent lines on my RV-9A project and will go with a couple loops in the wing roots with the vent lines before dropping down and then exiting.
David C.
Howell, MI
RV-10: #41686 Under Construction
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2021
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Old 09-24-2021, 05:08 PM
F1 Rocket F1 Rocket is offline
Join Date: May 2008
Location: Melboring, FL
Posts: 224

Double loop in the wing root. Itís never been an issue.
F1 Rocket #25
N14ZM "Dreamer"
Melboring, FL
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Old 09-24-2021, 06:46 PM
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airguy airguy is online now
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,546

In my 9A I use the rocket style double loop on the outboard tanks with a bottom skin Bonaco 45-degree cut vent entrance, works great with no siphon. I use flow-through venting from the outboards to the inboards.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2021 dues paid
N16GN flying 850 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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Old 09-25-2021, 12:33 PM
andoman andoman is offline
Join Date: Jul 2006
Location: Payson, AZ
Posts: 32

The original vents on the RV4 had chaffed through where they passed through a loose adel.
I replaced them with the Rocket style vents: No siphoning and I have over filled them a few times.
I built an early 7A and find the Rocket vents to be superior in every way to the Van’s design.
However: I acquired a Rocket project that already had the Van’s vents installed. The Rocket vents aren’t superior enough to motivate me to redo them.
"The plane won't build itself..." RV-7A N7.62MM sold
-RV4 purchased. Extensive refurbishment complete. ďTakes off by itís self, flys hands off, lands by itís self...Ē
-HRII project: paint and panel to go!

Last edited by andoman : 09-25-2021 at 12:36 PM.
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