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09-15-2017, 10:03 AM
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Join Date: Aug 2013
Location: Israel
Posts: 3
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RV-14 inverted flight
Anyone can tell me anything about inverted flight fuel supply in RV14?
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09-15-2017, 01:33 PM
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Join Date: Aug 2011
Location: McMinville, OR (KMMV)
Posts: 244
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Are you going with a stock FWF?
It depends on what you plan to install FWF.
A friend's RV-14 has the EFII system, this uses dual electric fuel pumps. As far as fuel goes as long as the fuel tank has a flop tube for pickup the rest of the EFII system doesn't care/know it's inverted.
Are you looking for sustained inverted flight or sportsman level aerobatics?
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09-15-2017, 05:09 PM
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Join Date: Aug 2017
Location: Melbourne, Australia
Posts: 279
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Quote:
Originally Posted by mill2978
as long as the fuel tank has a flop tube for pickup the rest of the EFII system doesn't care/know
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I read on here that you can't put a flop tube in the -14 tanks (but I can't remember the reason!).
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09-16-2017, 09:40 AM
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Join Date: Mar 2006
Location: Spring Hill, KS
Posts: 365
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I wonder if you'll be happy with how the -14's airfoil works inverted. I recall years ago hearing Van say that one reason he selected the 23000 series NACA section for the 3/4/6/7/8 models is because it works reasonably well inverted. I suspect the -14 airfoil won't do too well inverted since it had very different design goals (originally designed for the -10). Anybody have any data points on how it flies inverted?
The mission of the 14 is more geared toward comfortable XC and oh by the way you can also do loops, rolls, and spins, but if you're wanting to do more serious acro including negative G I'd recommend a 7 or 8.
__________________
Mark Navratil
Spring Hill, KS
RV-8A N2D #80583 - built/flew/sold
RV-14A #140017 - wings complete, empacone in progress...
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09-18-2017, 10:00 AM
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Join Date: Jul 2015
Location: Marcoussis, France
Posts: 125
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I asked to Van's the same question. The answers were : the fuel tanks don't accept flop tubes and the '14 pass the positive G aerobatic figures. So any fuel and oil inverted system is required.
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09-20-2017, 06:35 AM
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Join Date: Mar 2017
Location: Birmingham, Alabama
Posts: 1,643
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I don't think you need anything beyond stock for occasional loops and rolls?
.. which brings up the question on how to keep the stock brake reservoir from leaking ..
__________________
RV-14A #140376
N196 (Flying)
2019 Bronze Lindy
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09-20-2017, 07:01 AM
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Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,218
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Quote:
Originally Posted by bkervaski
I don't think you need anything beyond stock for occasional loops and rolls?
.. which brings up the question on how to keep the stock brake reservoir from leaking ..
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It isn't an issue on gentleman's aerobatics.
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Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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09-20-2017, 07:08 AM
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Join Date: Dec 2012
Location: Greenback, TN
Posts: 534
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Brake reservoir
Quote:
Originally Posted by bkervaski
I don't think you need anything beyond stock for occasional loops and rolls?
.. which brings up the question on how to keep the stock brake reservoir from leaking ..
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Contact Alex Peterson for a check valve that screws into the top of the reservoir. I think he calls it a Reservoir Dog. Could be wrong on the name, I bought mine a few years ago.
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Marvin McGraw, 5TN4
RV-14. #140039 Complete
Flight hours: 500+
2020 Dues Paid
The Dues Paid note is a reminder for me
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09-20-2017, 07:10 AM
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Join Date: Mar 2017
Location: Birmingham, Alabama
Posts: 1,643
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Okay, that's a fantastically simple mod, thanks!
http://reservoirdog.alexap.com/index.html
__________________
RV-14A #140376
N196 (Flying)
2019 Bronze Lindy
Last edited by bkervaski : 09-20-2017 at 07:12 AM.
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09-20-2017, 08:43 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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If the aerobatics you are doing are all positive G's (required to keep the engine running and healthy if no inverted fuel and oil system is installed) then there is no need to do anything different with the brake reservoir cap.
The same (positive G) forces that keep the oil and fuel in the proper place will do the same with the brake fluid as well.
BTW, an inverted fuel pick-up capability was never planned for the design of the RV-14 because its primary mission profile is cross country travel with the ability to get upside down occasionally if desired (for 99.9% of people that means positive G's aerobatics only).
The standard fuel pick-up design works fine for this.
For the other .1%, they could redesign the fuel pick-up to a flop tube installation.
__________________
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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