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Old 04-01-2021, 02:08 PM
Zero4Zulu Zero4Zulu is offline
Join Date: Nov 2008
Location: Scio,Oregon
Posts: 276
Default New Fuel caps.

Finished up a couple custom fuel caps for My 6A.

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I designed these for easier removal and semi-tamper resistant. I don't have to use a pry bar to lift the lever. They have top flipper handle that pulls up easily, that starts the main lever coming up. Then you flip the main lever to relieve the O-ring pressure and the cap can be removed. I incorporated a locking feature that requires a 1/4 turn with a custom tool. Material is 6061Al. and 17-4 stainless steel.

Just another project I dreamed up for product ideas...
Steve S.
Rebuilding RV6A
Scio, OR
EAA Ch. 292
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Old 04-01-2021, 02:13 PM
KayS KayS is offline
Join Date: Jul 2009
Location: lake constance
Posts: 358

Neat!!!! How's your aircraft looking if your fuel caps are like that?
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Old 04-01-2021, 02:28 PM
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Zuldarin Zuldarin is offline
Join Date: Mar 2013
Location: Snoqualmie, wa
Posts: 404

Wow, those look nice! Are you going to sell those or if not, share the design? I know of a few people who would love those as a replacement.
Snoqualmie WA
RV-9A Sold
RV-10 Building - Working on the last 90%
2021 donation sent!
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Old 04-01-2021, 02:47 PM
D Weisgerber's Avatar
D Weisgerber D Weisgerber is offline
Join Date: Sep 2019
Location: Ionia Michigan
Posts: 243

Those look great, the rest of your airplane must be outstanding.
Are these the older style caps? I would like to buy a couple like that for my RV8, If anybody makes them. Mine are the newer style that have a 1/4 turn to remove.
RV6 N7219d
Sam James cowl
first flight May 2, 1997
RV8 #83830 tail done, wing done, fuselage done.
Working on the finish kit.
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Old 04-01-2021, 03:02 PM
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jrock836 jrock836 is offline
Join Date: Nov 2020
Location: Burleson, Texas
Posts: 189

Beautiful.. I'd buy one!
Van's RV-12 #120566 - ELSA - N49DD
Hawkins Field (35TT ) Godley, TEXAS!

LSRI-A for N49DD
EAA #1409566 / AOPA Member
Private Pilot since '79!
Retired LEO - Served 28 years
Honorably Discharged USNR - MA2
PADI Master Scuba Instructor / SDI OW Instructor
Scuba Equipment Technician (PT Retirement Job)

If you can walk away from a landing, its a good landing. If you can use the aircraft the next day, its an outstanding landing. Chuck Yeager

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Old 04-01-2021, 03:51 PM
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RV7A Flyer RV7A Flyer is offline
Join Date: Jul 2013
Location: US
Posts: 2,414

I would totally buy a set of those!
2019 Dues paid!
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Old 04-01-2021, 03:59 PM is offline
Join Date: Jan 2017
Location: Battle Ground WA
Posts: 186

Better not forget to latch and it falls through somebodies roof. OOPS!!!
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Old 04-01-2021, 04:31 PM
BillL BillL is offline
Join Date: Sep 2007
Location: Central IL
Posts: 5,891

It appears these still expand the o-ring between two conical surfaces within the neck to secure them. Please clarify. If so, then Krytox will ensure they don't stick, ever.

Now the obvious . . . a beautiful design execution!! - The locking feature is clever and useful.

EDIT: Thanks for the update post on the action of the cap. The although the external friction of the handle contributes to the force required to latch, it does nothing for the release. The root cause of this cap design is the sticking of the wedge to the o-ring in the compressed state. As the cones draw together the o-ring must expand sliding between the cones. This means when full activated (expanded) the o-ring is stuck to the cones and this is the root cause failure mode for having to push on the pin to release the cap. Krytox is more than a fancy name. The key characteristic to Krytox demonstrated success is it's insolubility in gasoline. All other lubricants dissolve. EZTurn simply sticks.

This is no way detracts from the beauty, function and execution of your design! It is just not a solution for the primary root cause of sticking.

Lord Kelvin:
I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.

Last edited by BillL : 04-02-2021 at 07:10 AM.
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Old 04-01-2021, 05:14 PM
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Av8safe Av8safe is offline
Join Date: Jun 2019
Location: Valparaiso, Indiana
Posts: 78
Default Put me on the waitlist

Those look fantastic! If you do go to production I would be interested in a pair for my RV7. Looking forward to seeing pictures of your build and other custom feature craftsmanship.
RV-7 #72497
Lycoming IO-360-M1A, Catto 3-blade,
Dual GRT HX, Garmin 530W, SL30, GTX327
TruTrak II VSGV, EchoUAT
2021 Dues (Plus) Paid
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Old 04-01-2021, 05:19 PM
Zero4Zulu Zero4Zulu is offline
Join Date: Nov 2008
Location: Scio,Oregon
Posts: 276

These work the same way the Vans cap with the same O-rings and nylon tapered washers. One thing that makes these work so nicely is the little plate under the latch is heat treated hard 440 stainless so the friction between the two dissimilar materials is less.
Steve S.
Rebuilding RV6A
Scio, OR
EAA Ch. 292
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