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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-863216@logan.com>
Subject: Re: [FlyRotary] fuel/brake lines fittings
Date: Sun, 4 Dec 2005 21:58:20 -0500
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----- Original Message ----- 
From: "Ernest Christley" <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, December 04, 2005 9:22 PM
Subject: [FlyRotary] fuel/brake lines fittings


> Ed Anderson wrote:
>
>> No question you normally want to use fittings of matching metals. 
>> However, there has been some discussion about very small aluminum 
>> fittings (such as -3) not having much reserve strength (compared to 
>> larger aluminum fittings and of course steel fittings).
>>
>> The Cleveland calipers I use come tapped for an (AN-4) - 1/8NPT fitting. 
>> I use this fitting to screw into the caliper.   Then I use -4 Steel hose 
>> Fittings that mates with a -3 brake hose (strange I know, but they make 
>> them).  Since the standard fittings for the Clevelands are the above 
>> mentioned AN -4 - 1/8 NPT fittings, I use the aluminum -4 fittings (NPT 
>> on one end) to screw into the aluminum calipers and screw the -4 steel 
>> hose fitting onto the AN portion of the caliper fitting.  All the brake 
>> fittings on the RVs are -4(which I already had installed), so I stuck 
>> with that (except for the -3 hose).  You can certainly use -4 lines, but 
>> I found them to feel a bit mushy for my taste and prefer the smaller -3 
>> hose.
>>
>> My 0.02 worth
>
> Ed, can I get you to give me 0.03 worth? 8*)
>
> I've order 3/16 (-3) aluminum tube for the 'middle' runs that will 
> interface with well anchored bulkhead at both ends.  The ends will 
> obviously have to be flared connections.  Are you saying there are 
> aluminum fittings that will interface the -3 flared tube with -4 
> connections?
No, that is not what I intended to say {:>).

 There are AN-3 aluminum fittings for flared aluminum tubing.  You need a 
tube nut AN-819 and a tube sleeve AN-818 for a 3/16" line end.  Then to 
connect  that to your flexible -3 SS braided hose on one end you would need 
and AN-3 hose fitting and then ideally an AN-3/1/8NPT fitting to screw into 
your caliper.  However, I used the AN-4 1/8NPT right angle fitting to screw 
into to my caliper because that is what Van provided with the kit.  That is 
why I needed the strange AN-4   to -3 hose fitting in order to use the -3 SS 
braided hose brakeline.

  On your bulkhead end, you would  need a AN-3 fitting for the flare nut of 
the 3/16" aluminum line to screw on to.  IF you are using the AN-4 fittings 
for your bulkhead and caliper fittings then there is no way I am aware of 
that you can use 3/16" aluminum line and have a AN-4 flare nut (at least I 
have not found any such adapter) , you would have to use 3/8" aluminum 
tubing.  However, if you use -3 SS braided line from bulkhead to caliper 
then you can use the steel AN-4 /-3 Hose adapter and connect the -3 brake 
line to the AN-4 fittings.

Here is a source for steel AN-3/1/8NPT that could be screwed into the 
calipers and then you would be -3 all the way.  There are AN-3 1/8NPT 
aluminum fittings but I have heard stories (no first hand evidence as I did 
not use them) that aluminum fittings that small do not have much reserve 
strength and I am hesitant to use them.

Here is the URL  http://www.rjays.com/Brakes/brk-fttgs-01.htm  check out the 
adapters part no. ALL50000.

Hope I have not confused the matter more

Ed