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  #1  
Old 09-15-2017, 11:03 AM
amirgreenfield amirgreenfield is offline
 
Join Date: Aug 2013
Location: Israel
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Default RV-14 inverted flight

Anyone can tell me anything about inverted flight fuel supply in RV14?
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  #2  
Old 09-15-2017, 02:33 PM
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mill2978 mill2978 is offline
 
Join Date: Aug 2011
Location: Erie, CO (KEIK)
Posts: 201
Default 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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  #3  
Old 09-15-2017, 06:09 PM
TASEsq TASEsq is offline
 
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Location: Melbourne, Australia
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Default

Quote:
Originally Posted by mill2978 View Post
as long as the fuel tank has a flop tube for pickup the rest of the EFII system doesn't care/know
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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  #4  
Old 09-16-2017, 10:40 AM
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czechsix czechsix is offline
 
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Location: Spring Hill, KS
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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.
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  #5  
Old 09-18-2017, 11:00 AM
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Erimo Erimo is offline
 
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Location: Marcoussis, France
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Default

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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  #6  
Old 09-20-2017, 07:35 AM
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bkervaski bkervaski is offline
 
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Location: Birmingham, Alabama
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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 ..
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  #7  
Old 09-20-2017, 08:01 AM
Kyle Boatright Kyle Boatright is offline
 
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Location: Atlanta, GA
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Quote:
Originally Posted by bkervaski View Post
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 ..
It isn't an issue on gentleman's aerobatics.
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  #8  
Old 09-20-2017, 08:08 AM
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M McGraw M McGraw is offline
 
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Location: Greenback, TN
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Default Brake reservoir

Quote:
Originally Posted by bkervaski View Post
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 ..
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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  #9  
Old 09-20-2017, 08:10 AM
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bkervaski bkervaski is offline
 
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Okay, that's a fantastically simple mod, thanks!

http://reservoirdog.alexap.com/index.html
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Last edited by bkervaski : 09-20-2017 at 08:12 AM.
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  #10  
Old 09-20-2017, 09:43 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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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.
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