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Header tank fittings

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Dillfamily(at)sbcglobal.n
Guest

Posted: Tue Jan 03, 2006 6:10 pm Post subject: Header tank fittings



Let's see if I can ask this question without looking as stupid as I feel. I am trying to purchase NPT and AN fittings to install a behind the seat header tank in my model 2. One of the guys provided me with a used tank without fittings and I am trying to order what I need. I went into the local auto parts store and the guy matched a fitting with one of the holes and called it a 3/8" fitting. I can see with my eyes that the hole is bigger than a half inch, but didn't question him about it. (I bought some fittings from him that fit, but they are brass and I would rather switch to aluminum). Now, with ruler in hand, I am measuring that hole to be 5/8", but I see the chart in the Aircraft Spruce book which sizes the fittings by the "theoretical I.D. of fittings". I could conceive that they are referring to the inner diameter of the line that the fitting attaches, but there are pictures in the catalogue that, if to scale, contradict that notion. If I have made any sense so far, could somebody give me a clue about how to identify the sizes I need to fit the Skystar header tank.

Also, I see that the Skystar instructions call for rubber wing tank feed lines all the way to the header tank. I was thinking that aluminum would be superior for reasons of weight and durability, am I correct about that? I would, of course, have to use rubber for the (approximate) first foot out of the wing tanks to allow the wings to fold.

Capt Jeffrey R. Dill

(860) 295-8372 home

(860) 985-4315 cell

I

( )

O O

N767JD Model 2

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jdmcbean(at)cableone.net
Guest

Posted: Tue Jan 03, 2006 6:27 pm Post subject: Header tank fittings



3/8 NPT (National Pipe Thread) .. I would go with the brass fittings you

have they will be just fine.

Have a Safe New Year !!

John & Debra McBean

www.sportplanellc.com

"The Sky is not the Limit... It's a Playground"

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lcfitt(at)sbcglobal.net
Guest

Posted: Tue Jan 03, 2006 7:01 pm Post subject: Header tank fittings



Jeffery,

If you bought 5/8 fittings and they fit, use those dimensions for the AN

fittings - 10D as the part suffix.

The actual fitting - the threaded part- is much larger than the fractional

designation. I don't know how it works, but that is the way it does. It

might have to do with the inner diameter of the tubing or pipe. I am sure

some plumbing guru will make us all a little bit smarter on that part.

Lowell

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kingjohne(at)adelphia.net
Guest

Posted: Tue Jan 03, 2006 7:43 pm Post subject: Header tank fittings



Jeffrey,

Go with the aluminum tubing except for the area, except for the first foot out of the wing tanks to allow the wings to fold. That's what I did and it has worked very well.

--

John King

Warrenton, VA

Dill Family wrote:

Also, I see that the Skystar instructions call for rubber wing tank feed lines all the way to the header tank. I was thinking that aluminum would be superior for reasons of weight and durability, am I correct about that? I would, of course, have to use rubber for the (approximate) first foot out of the wing tanks to allow the wings to fold.

Capt Jeffrey R. Dill

(860) 295-8372 home

(860) 985-4315 cell

I

( )

O O

N767JD Model 2

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bnn(at)nethere.com
Guest

Posted: Tue Jan 03, 2006 8:40 pm Post subject: Header tank fittings



At 07:01 PM 1/3/2006, you wrote:

 	  Quote: 	
		  If you bought 5/8 fittings and they fit, use those dimensions for the AN

fittings - 10D as the part suffix.

	


Lowell,

Correct me if I'm wrong, but isn't there some concern with getting

the right angles? I believe any brass compression fittings you'd get at the

local auto parts or hardware store are 45 degree flares. And I believe that

AN fittings are 37 degree flares. Aren't the two incompatible? And don't

you have to make sure you have the flare tool that matches the fitting? (I

realize this doesn't apply to pipe fittings.)

PS I also did 1' of flex and the rest aluminum. I think it's a much neater

way to go, and was surprisingly easy to do. (I used 3/8" for both tank

feeds, and 1/4" for the vent.) My wings fold without having to fiddle with

the fuel lines.

Guy

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morid(at)northland.lib.mi
Guest

Posted: Wed Jan 04, 2006 5:23 am Post subject: Header tank fittings



Jeff, all pipe thread (NPT) fittings are measured via inside diameter (ID).

The 3/8" fittings you bought were the correct size. There are several ways

to plumb the tank. You can use the brass fittings with barb ends so that

the hose runs all the way from the tank to the header. This is a perfectly

acceptable way of doing it and is the way the manual states. It also allows

lots of flexibility in the line. The downside is that if you have a leak

that you need to repair, it can be very difficult to remove the fuel line

from the barbed fitting and usually destroys the end of the hose.

Another way is to install a 3/8 nptXflare fitting and use aluminum the way

you would like to do below. If you use AN aluminum fittings then you need a

37 degree flare tool. They're pricey, but usually can be borrowed. The

easiest way is to use brass fittings so that you can use a standard 45

degree flare that are available pretty much anywhere. Nothing wrong with

it. The downside is slightly more weight. The advantage to using the flare

fittings is that you can remove the fitting to service the header tank

without destroying the hoses. If I were to do this again, I'd probably go

this route.

Use high quality hose fitting sealer. Locktite, Oatey, Permatex are a few

brands and have many to choose from. Just ensure the one you use is

compatible with the materials you're sealing.

Hope this helps a little.

Deke

 	  Quote: 	
		  

Let's see if I can ask this question without looking as stupid as I

feel. I am trying to purchase NPT and AN fittings to install a behind the 	


seat header tank in my model 2. One of the guys provided me with a used tank

without fittings and I am trying to order what I need. I went into the local

auto parts store and the guy matched a fitting with one of the holes and

called it a 3/8" fitting. I can see with my eyes that the hole is bigger

than a half inch, but didn't question him about it. (I bought some fittings

from him that fit, but they are brass and I would rather switch to

aluminum). Now, with ruler in hand, I am measuring that hole to be 5/8", but

I see the chart in the Aircraft Spruce book which sizes the fittings by the

"theoretical I.D. of fittings". I could conceive that they are referring to

the inner diameter of the line that the fitting attaches, but there are

pictures in the catalogue that, if to scale, contradict that notion. If I

have made any sense so f!

 	  Quote: 	
		   ar, could somebody give me a clue about how to identify the sizes I need

to fit the Skystar header tank. 	


 	  Quote: 	
		  

Also, I see that the Skystar instructions call for rubber wing tank

feed lines all the way to the header tank. I was thinking that aluminum 	


would be superior for reasons of weight and durability, am I correct about

that? I would, of course, have to use rubber for the (approximate) first

foot out of the wing tanks to allow the wings to fold.

 	  Quote: 	
		  

Capt Jeffrey R. Dill

(860) 295-8372 home

(860) 985-4315 cell

I

( )

O O

N767JD Model 2

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rjdaugh(at)rapidnet.com
Guest

Posted: Wed Jan 04, 2006 5:53 am Post subject: Header tank fittings



Jeffery,

Pipe fittings are referred to according to their nominal inside diameter.

So those are 3/8" fittings. Metal tubing on the other hand refers to the

outside diameter.

I went with a tygon tubing. I find some comfort in being able to actually

see the fuel or bubbles in the tubes.

Randy

.

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lcfitt(at)sbcglobal.net
Guest

Posted: Wed Jan 04, 2006 7:29 am Post subject: Header tank fittings



Yes you are right, I didn't think of that as I was thinking of the bushing

and barb fittings. If you are using aircraft tooling the 'Aircraft Spruce

fittings would work. I think they are available in both aluminum and brass.

Lowell

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rliebmann(at)comcast.net
Guest

Posted: Wed Jan 04, 2006 7:43 am Post subject: Header tank fittings



I am turning my computer off for about 3 days......Remodeling the computer

area.

Thanks, Ron N55KF

DO NOT ARCHIVE

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