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  #11  
Old 08-20-2021, 10:18 AM
D Weisgerber's Avatar
D Weisgerber D Weisgerber is offline
 
Join Date: Sep 2019
Location: Ionia Michigan
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Quote:
Originally Posted by Walt View Post
Why not just run hard lines down the legs like the plans call for?
Would way be easier than pulling the gear.
It looks like he has the airfoil shaped gear legs so he probably isn't using gear leg fairings, so there wouldn't be anyway to cover the lines.
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  #12  
Old 08-20-2021, 11:39 AM
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riseric riseric is offline
 
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Quote:
Originally Posted by D Weisgerber View Post
It looks like he has the airfoil shaped gear legs so he probably isn't using gear leg fairings, so there wouldn't be anyway to cover the lines.
Confirmed
The Airfoiled Gear has an internal oil line in the leg.
And no fairings needed.
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  #13  
Old 08-20-2021, 12:55 PM
jrs14855 jrs14855 is offline
 
Join Date: Apr 2008
Location: Lake Havasu City AZ
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Default fitting

Look for a 90 degree street elbow. NAPA has them as well as MSC Hard to tell from the photo but I think they would work. if the first one you find doesn't work look for a different manufacturer. They vary considerably. You may need to customize a wrench to fit. Then a straight AN fitting or a special hose with a male pile thread on the hose end. I personally don't like the nylo flow tubing but that would also work.
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  #14  
Old 08-20-2021, 01:01 PM
jrs14855 jrs14855 is offline
 
Join Date: Apr 2008
Location: Lake Havasu City AZ
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Default fitting

search JEGS 63082 for a picture of the type fitting I mentioned. Don't worry about the brass or the non AN fitting, they were used for the oil pressure line on some certified Pitts aircraft.
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  #15  
Old 08-20-2021, 01:44 PM
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rv8ch rv8ch is offline
 
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Quote:
Originally Posted by moespeeds View Post
There is one possibility that I came up with in the shower this morning.

In the race cars we use an Aramid PTFE brake hose that's ultra flexible. I'm wondering if I could cut out that elbow fitting, put in a straight fitting, then replace the hard line with an Aramid hose with a 90* fitting on the end...

I'll order a -4 straight and the 90* fitting so I can assemble on the bench and test the clearance.
My recommendation - get a buddy to help you get the aircraft securely up off the wheels and pull the gear leg. It will take two people about a day to do it. You will spend a lot of effort to find out what Tom said - there ain't enough room in there to do it another way, unfortunately, and if you mess it up, you'll have to pull the gear leg anyway. Also, if you don't have the "good" nuts on those gear bolts, it would be a good time to install them.
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  #16  
Old 08-20-2021, 02:12 PM
jrs14855 jrs14855 is offline
 
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Default fitting

I didn't mention the obvious, that the 90 degree fitting needs to be cut off as far away from the gear as possible. Die grinder with thin disc or cutoff blade. Then some vice grips to remove the remainder. The street elbow with AN 616 straight fitting will only require a small change in the tube length. or can the hole that the tube goes thru be elongated and the tube be moved slightly?
The nylo flow with brass fittings may be the best option. My main objection to the nylo flow is the heat from the brakes which will not be an issue here.
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  #17  
Old 08-21-2021, 07:13 AM
TS Flightlines TS Flightlines is offline
 
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Well, there "is" an alternative, that hasnt been tested, nor engineered for that matter. Now I'm not saying do this, "but" on the inside of the gear tower, mark an area (if you can get to it through the lightening holes) and open up an elongated hole somewhat where the fitting would be. Purpose is so the fitting could be turned out and in without hitting the floor.

I would think---me thinking out loud which is a BAD thing (right Ken?), there is enough substantial tower structure in the area that opening an elongated hole 1x1.5 inches would solve the issue. Getting access to do this, well thats another story.
Just saying. Alternative to pulling the gear legs.

Oh and response to Jim's statement about variances in fittings, yes in industrial to a point, NO to actual Mil-Spec AN/MS/NAS fittings. Industrial generally meets a SAE spec, although alot of industrial manufacturers have there own versions that resemble a standard fitting. Real AN/MS/NAS fittings all match the same drawings, thats why they are interchangeable, and are include in FAA, Standard Part. "Some" of the old Eaton Weatherhead fittings that NAPA used to sell (I think they have mostly gone to Gates now) did interwith change a MS number, as shown in their catalogs. Check that now, or just use a real Mil Spec fitting, OR one that meets the drawings for dimensions. Careful----some look a like fittings are not the approved material!.

Tom
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Last edited by TS Flightlines : 08-21-2021 at 07:23 AM.
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  #18  
Old 08-21-2021, 10:34 AM
jrs14855 jrs14855 is offline
 
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Location: Lake Havasu City AZ
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Default fitting

The reason I mentioned the brass automotive fitting is that it requires less clearance than the AN equivalent. If you find the right automotive or industrial fitting the clearance requirement is almost the same as a straight AN fitting. The only issue with the automotive street elbow is that you will probably need one or more modified wrenches. A offset open end wrench, with different angles on each end, might also work.
The parts would be:
90 degree street elbow
AN914-1D if you keep the aluminum tubing
For Nylaflow tubing:
Aircraft Spruce part number 05-04349( this is heavy wall tubing rated at 2500 psi. Used for decades on EAB for brake lines)
Fitting is 268P
This would be so much easier than removing the gear.
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  #19  
Old 08-23-2021, 05:16 PM
BMallory BMallory is offline
 
Join Date: Nov 2019
Location: Guyton, Georgia
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Banjo fitting
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  #20  
Old 08-24-2021, 08:11 AM
TS Flightlines TS Flightlines is offline
 
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Brian, NPT banjos are tough to come by, but a great idea. The tapered port in the gear leg is the issue. You'd need a custom NPT stem with a hex to secure it in the gear leg---installed height may be a factor--, then a straight stem for the banjo. A NPT male to ORB Female bushing could work, but again the clearance may not allow all of that to get in the confined space.

Even a NPS (NPT swivel) fitting probably wouldnt clear, AND with only an internal O'Ring to seal the stem, from experience the can leak at low pressures.
A NPT Male to Straight thread (7/16-20) insert might work, but you'd have to pull the gear to install it anyway.

The Banjo is a good idea though---if during the manufacture of the gear leg, the port were a straight thread instead of an NPT tapered one.

Tom
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Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7A Tail Kit Completed, Fuse started-Pay as I go Plan, on hold while we develop new products for RV builders
Ridgeland, SC
www.tsflightlines.com, www.asflightlines.com
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