VAF Forums

VAF Forums (https://vansairforce.net/community/index.php)
-   RV General Discussion/News (https://vansairforce.net/community/forumdisplay.php?f=2)
-   -   Christen Hose and Fittings Kit ? What am I Missing? (https://vansairforce.net/community/showthread.php?t=64169)

pierre smith 10-27-2010 04:58 AM

Contact Tom Swearingen..
 
...at TS Flightlines. All he needs is lengths and diameters. He recently made me new stainless braided, firesleeved hose with stainless fittings for my -10, fuel and oil lines, for only $389!!

http://www.tsflightlines.com/

Best,

Capflyer 10-27-2010 08:45 AM

In our area we have a chain of hydraulic/pneumatic hose & fittings shops called Calliflower. I'm sure there are similar types of places in your area. They deal with all types of hoses and fittings for the trades and are extremely reasonably priced compared to the usual suspects.

When I've needed hoses I go there and have them custom made. They will also pressure test the hoses for you. They have so many different types of hoses and fittings its like a candy store for guys like us.

Danny King 10-27-2010 01:39 PM

Christen special fittings
 
Iron Flight,

Make sure you get the special plug for the oil feed line at the swivel fitting, the special positive G lower sump pickup fitting, and oil return/ inverted breather sump fitting.

I also recommend you switch from the standard inverted oil pickup to the vacuum pump pad inverted oil pickup fitting. I got that one from Bart at Aero Sport Engines.

Toobuilder 10-27-2010 02:32 PM

May be just one data point, but be very aware of the hose you do use. When I bought my Hiperbipe one of the hoses found chaffed on the pre buy inspection. A new hose was fabbed on the spot with brand new off the roll Aeroquip hose by an A&P. 3 hours into the flight home, my oil pressure dropped to ~30 PSI, requiring a landing at the nearest airport. Long story short, the new hose collapsed on itself internally due to suction (no visible defect from outside) and seriously restricted flow. I've never even heard of that before.

Based on this, this is one area where I think it's good to buy high quality hose from the start (and another reason why I avoid hose unless absolutely required).

frankh 10-27-2010 05:16 PM

What?
 
I'd be very interested in what is causing so much suction to collapse the hose in the first place.. Its not normal to deisgn an oil sysytem that will make that much suck..Reason being is if you get any kind of leak you could airlock your oil pump and seize the engine.

Sure you didn't have a partially plugged strainer at the end of that pipe?

Frank

Toobuilder 10-27-2010 05:27 PM

The strainer is between the hose and the pump. Even if clogged, that would lessen the suction seen by the hose. It failed because it was bad hose.

TS Flightlines 10-27-2010 06:18 PM

Michael--what kind
 
of hose was the one that collapsed?
Tom

Flybipe 10-27-2010 07:23 PM

"And do make your own hoses - they are the exact same thing!"
 
Oh, and when you do make your own hoses for your certified Christen inverted oil system and your engine siezes because you used the wrong hose or fitting from Walmart and it failed, starving the engine of oil, Aviat's gonna get dragged into court on that one too!

Sue first, settle later!

Given the nearly 1:1 ratio of lawyers-to-idiots in this country, it's amazing anyone manufactures anything anymore : )

Toobuilder 10-27-2010 08:18 PM

Quote:

Originally Posted by TS Flightlines (Post 479760)
of hose was the one that collapsed?
Tom

Don't know the PN, but it was not teflon lined... Just basic rubber with stainless outer braid. Looks like Stratoflex 156.

I still have the hose to show people who stop by the hangar.

Toobuilder 10-29-2010 12:15 PM

Tom (and anyone else),

Here's pictures:



#10 hose as removed from the airplane. One fitting removed in an attempt to figure out what happened.



Cut hose. Failed area is about 4 inches long - starts about 2" from the fitting end.



Section through the failed area.

Airplane has 1600 hours on it with no failure of this kind before or since. I suspect a bad batch of hose.


All times are GMT -6. The time now is 07:52 AM.