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David,in my younger days I use to race in a front wheel drive Renault (1.8 mile circuit) I made my pads out of Boeing 747 brake pad material. After a half hour race the rotors were glowing red hot. I used the same stainless steel braided Teflon flex hoses, race the car for five years & never had a hose problem.
Georges B.
Date: 06/24/05 15:09:33
Subject: [FlyRotary] Re: Brake Line Incident Photos
Re "stainless steel braided line", Ed: The stuff inside the "stainless
steel braid" ain't "steel" - it's rubber and/or Teflon tubing - stuff that
will melt from heat soaking from hot calipers back into hose.
David
----- Original Message -----
Sent: Friday, June 24, 2005 2:47 PM
Subject: [FlyRotary] Re: Brake Line Incident Photos
> No Marc,
>
> The plans call for aluminum tubing all the way to the caliper fitting.
The
> design does call for a "Loop" around the landing gear rod to provide for
the
> aluminum line to flex as the caliper moves in and out - mine had this
loop.
> However, giving the poor fatigue characteristics of Aluminum, I think a
> flexible line is the only way to go. Stainless steel braided line has my
> vote. However to be fair, Van has hundreds if not thousands of RVs
flying
> with this set up. Bill, mentioned an RV-8 transiting Thailand having a
> similar brake fire recently and I have heard of others - but not many.
Its
> "too many" when it happens to you {:>)
>
> Its a pretty helpless feeling to exit the side of the runway and only be
> along for the ride {:>). My first schedule refueling stop was at
> Gunntersville, Al which has its runway running out into a lake - sure glad
I
> never got that far as you can imagine.
>
> Ed
>
>
> ----- Original Message -----
> Sent: Friday, June 24, 2005 3:33 PM
> Subject: [FlyRotary] Re: Brake Line Incident Photos
>
>
> > Ed,
> > Almost all certified installations have a flexible line section at the
> > wheel to connect from the leg al tubing to the wheel brake puck assy.
Did
> > you have that?
> > Marc Wiese
> >>
> >> Date: 2005/06/24 Fri AM 10:21:43 EDT
> >> Subject: [FlyRotary] Re: Brake Line Incident Photos
> >>
> >> Yes, John - luck and a quick acting nephew {:>). The only answer I can
> >> come up with is that the aluminum line suffered a fatigue fracture
which
> >> weakened the tube and the hydraulic pressure finally blew out the
chunk.
> >> The line has a loop to provide flexing as the caliper moves in and
out -
> >> but, flexing aluminum is not know for a long life. In all fairness,
> >> there are many RVs flying with this configuration - so the break might
be
> >> attributed to my installation (stressing the line when I put the loop
in
> >> it), material weakness, some damage I did not notice, etc. Had over
300
> >> landings before the failure.
> >>
> >> Ed
> >> ----- Original Message -----
> >> From: John Slade
> >> To: Rotary motors in aircraft
> >> Sent: Friday, June 24, 2005 9:09 AM
> >> Subject: [FlyRotary] Re: Brake Line Incident Photos
> >>
> >>
> >> Wow, Ed!
> >> You're luck the airplane wasn't consumed.
> >> My question - how did that big chunk get blown out of the brake line?
> >> Regards,
> >> John
> >> -----Original Message-----
> >> From: Rotary motors in aircraft
> >> Sent: Friday, June 24, 2005 8:58 AM
> >> To: Rotary motors in aircraft
> >> Subject: [FlyRotary] Brake Line Incident Photos
> >>
> >>
> >> For those interested (and may not have seen them) , here are a few
> >> photos of my brake line fire incident.
> >>
> >> Big chunk got blown out of brake line as can be seen from
> >> Brakelines.jpg photo. Effect of resin burning seen on wheel pant
photos.
> >> Once the line broke, the next time I depressed the brake pedal, a
> >> fireball from the wheel to over the wing resulted from spraying the
> >> hydraulic fluid over the hot brake assembly. The flash point of the
> >> fluid is only 240F! I am going to investigate some stuff with a bit
> >> higher flash point {:>)
> >>
> >>
> >> Ed
> >>
> >> Ed Anderson
> >> Rv-6A N494BW Rotary Powered
> >> Matthews, NC
> >>
> >
>
>
>
>
>
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