09 Jun 2025, 09:22 [ UTC - 5; DST ]
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Post subject: Re: possible to adapt single point refuel nozzle to standard Posted: 08 Feb 2016, 16:46 |
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Joined: 10/03/13 Posts: 553 Post Likes: +158 Location: KGJT
Aircraft: Kitfox
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Not sure if it helps, but often the single point connector is attached with a quick disconnect fitting, so that it can be removed and swapped for a overwing nozzle.
There would be a couple challenges with using a fuel farm that is solely designed to be single point. First, they only pump fuel when the "dead man" button is pressed and at least with the system I used to use, the flow rate was very high- which make overwing fueling exciting for the guy holding the nozzle.
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Post subject: Re: possible to adapt single point refuel nozzle to standard Posted: 10 Feb 2016, 01:08 |
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Joined: 04/22/15 Posts: 6 Post Likes: +2 Location: Lincoln Nebraska
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My first post on this site. This is something I know about as I spent many years working for the airline fuel vendor at Phoenix Sky Harbor.
It's possible and I think there is equipment for sale that can make it possible. Aside from a nozzle with a single point connection, the two big items that are needed is a pressure regulator and something for the deadman control.
Pressure regulator: You would need something to restrict the the flow of fuel out the overwing nozzle to a manageable rate by backing up the pressure behind the nozzle. Single point fueling works off pressure not a set gaklons per minute rate. Pressure fueling equipment will keep increasing the flow rate until the set psi is reached. (Typically 40psi) Out of an overwing nozzle that can turn the flow to fire hose velocity. Example: On a 737NG the single point refuel rate can be as high as 450gpm with all 3 tanks open. Close the center tank and it will drop to 260-280gpm into the wings. I think 30 to 40gpm is the most one would want to have come out of the overwing nozzle.
Dead man: there are two types of dead man controls I am familiar with. One is pneumatic that is controlled by a squezze clamp with or pull rope. I guess one could just use squeeze the deadman with one hand and fuel with the other but that sounds tricky. However IF you use an overwing nozzle the deadman I think can legally be bypassed or blocked as the nozzle does not allow for flow when not squeezed. Technically that is what happens on a tanker that has both single point and overwing nozzle , when the overwing nozzle utilized. The other type of dead man I know of is one that utilizes current through a scully connection and a electronic squeeze trigger. These are only utilized on refuelng tankers and I wouldn't even think about rigging up a way to block that off.
With all that said, I don't think it would be practical but it is possible.
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Username Protected
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Post subject: Re: possible to adapt single point refuel nozzle to standard Posted: 10 Feb 2016, 01:49 |
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Joined: 11/15/09 Posts: 1856 Post Likes: +1353 Location: Red Deer, Alberta (CRE5/CYQF)
Aircraft: M20E/Bell47
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Username Protected wrote: My first post on this site... Nothing to add to this thread except...John Welcome to BeechTalk! Glenn
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