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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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 Posted: Sat Jul 09, 2011 9:11 pm Post subject: External Brake Lines - crack |
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Understand. The Cardinal is a bit unique among Cessnas, with its
construction and design. Many planes use short flex lines between wing
tanks and hard lines in fuselage, for easy disconnect and absorbing
wing flex. IIRC those swivel joints for the RG are a bit of a
maintenance pain, although they don't need frequent attention. The
brake flex lines on my Mooney are a piece of cake. Every 10-15 years
when they get hard, just remove, make new lines and reinstall. They
get significant flex every time the gear goes up or down.
Just comes down to using good quality material with design that can
give with flex without work hardening. Obviously builder's choice of
what they want to use.
On Sat, Jul 9, 2011 at 9:50 PM, William Curtis <wwc4(at)njit.edu> wrote:
| Quote: | Kelly,
I think we are all in agreement that the 3003 versa tube is crap and 5052
would be much better. Also, when I said NO flexible lines are used in the
Cardinal fuel system, I meant from the firewall back. Naturally, firewall
forward is one place where flexible lines are standard.
William
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD |
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pietflyr(at)bellsouth.net
Guest
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| Posted: Sun Jul 10, 2011 3:06 am Post subject: External Brake Lines - crack |
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Yet even Cessna hard lines can have problems. My Cessna 140 brake lines
cracked and leaked at the top of the landing gear strut and had to be
replaced. Of course, this was after over 4000 hours and 53 years of
service, the last two of which were flying off a rough grass field. I do
think that the key is using 5052 tubing rather than 3003 - 5052 has
significantly higher fatigue strength. It is also critical to make good
smooth flares without over flaring.
Jack Phillips
#40610 Wings
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jcumins(at)jcis.net
Guest
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| Posted: Mon Jul 11, 2011 8:51 am Post subject: External Brake Lines - crack |
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I believe that Vans is using poor quality tubing. In production aircraft
they use 5052 based alum tubing. Vans supplies 301 based soft tubing. So I
have decided to not use any tubing material from Vans and order all 5052
tubing that one can get a good flare on with out the worries of cracking
like the 301 based tubing.
I will use Teflon hosed with fire sleeve on all fluid hoses in the engine
compartment.
Just my 3 cents worth
John Cumins
President
707-425-7100
707-425-7576 Fax
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