One thing I find interesting is how many people know/say that
you shouldn't use aluminum tubing for things like primer
lines that run between the engine and the cockpit, just for
the fact that aluminum can crack when it work hardens...yet
at the same time, many people don't believe this is a problem
with the brake lines around the gear legs. The gear leg/brake
area will flex far more drastically than most engine to
firewall lines will.
I think it's a no-brainer too....definitely flex lines out
around the wheel area. They should give a lifetime of service.
Tim Olson - RV-10 N104CD
do not archive
Ed Anderson wrote:
> Hi Bob,
>
> Hi Bob,
>
> In my case I followed the plans exactly, the apparent cause was fatique of
> the aluminum tubing which on the old RV-6A kits was bent to wrap around the
> gear leg to provide some "flex" as brake calipers worked in an out. Mine
> blew out a chuck of the tubing wall approx 1" long and 1/2 the circumference
> of the tube. I mean the line did not just break at a point; it fractured
> and blew out this segment.
>
> Here is a photo of the tubing. You can see the long piece of the sidewall
> taken out. There are several possibilities about why it broke. It had been
> in use for 5 years and over 250 hours of flying time, numerous landings.
> 1. Material defect - possible but unlikely after 300 hours
> 2. Tubing damaged (rock or something) - again possible, but there was no
> evidence of a dent or scratch that I could see
> 3. Possibly I work harden the aluminum tubing as I bent the loop around the
> axis.
>
> But, in any case, my nephew was taking a video when the line broke and a
> fire ball rose above the wing when the fluid ignited - exciting times
> commenced at that point. That was the same instant my right brake peddle
> went to the floor and I ended up exiting the runway - fortunately into a
> shallow ditch - managed to get the prop turned horizontal before hitting it.
>
> So damage was limited to my brand new Michelin tire and tube and the wheel
> pant.
>
> I have heard of several similar incidents - few when you consider the
> thousands of Rvs out there with aluminum tubing - however, take it from me
> once, is more than enough if it happens to you.
>
> Best Regards
>
> Ed
>
>
>
> Ed Anderson
>
> Rv-6A N494BW Rotary Powered
>
> Matthews, NC
>
> eanderson@carolina.rr.com
>
> http://www.andersonee.com
>
> http://www.dmack.net/mazda/index.html
>
> http://www.flyrotary.com/
>
> http://members.cox.net/rogersda/rotary/configs.htm#N494BW
>
> http://www.rotaryaviation.com/Rotorhead%20Truth.htm
>
> -----Original Message-----
> From: owner-rv-list-server@matronics.com
> [mailto:owner-rv-list-server@matronics.com] On Behalf Of Panama Red
> Sent: Wednesday, November 18, 2009 10:54 AM
> To: rv-list@matronics.com
> Subject: Re: Brake Fire wasBrakes
>
>
> I think I might have missed something. Why are so many RVs having brake
> fires, requiring the redesign of the entire brake system?
>
> I have been flying my RV for 8 years with the brakes built exactly to the
> plans. Just wondering, should I ground my RV and redesign the entire brake
> system?
>
> Bob
> RV 6 "Wicked Witch of the West"
> ----- Original Message -----
> From: <dave.gribble@mchsi.com>
> To: <rv-list@matronics.com>
> Sent: Wednesday, November 18, 2009 10:08 AM
> Subject: Re: Brake Fire wasBrakes
>
>
>>
>> Hi Ed - thanks for posting.... can you post the part number / source /
>> approximate $$ of the thicker rotors?
>>
>> Thanks again,
>>
>> dave
>> -------------- Original message ----------------------
>> From: "Ed Anderson" <eanderson@carolina.rr.com>
>>>
>>> I whole heartedly agree with Ed Holyoke about replacing the MIL-H_5606
>>> with
>>> the Mil-H-8328. Being one of those who had experience with a brake fluid
>>> fire while using the older MIL-H_5606, I never realized until after the
>>> incident that its' flash point was just a bit above the boiling point of
>>> water. Fortunately I only lost a wheel pant an tube/tire out of the
>>> incident.
>>>
>>> I also replace the aluminum tubes ( the side of the right brake line blew
>
>>> a
>>> chunk out and sprayed the hot rotor with brake fluid) with stainless
>>> steel
>>> braided brake lines and replace the brake rotors with a set that had
>>> double
>>> the thickness of the standard RV brake rotor. Doubling the mass with the
>>> same amount of heat effectively reduces the temperature of the mass.
>>>
>>> The thicker rotors provided an unexpected side benefit in that brake fade
>>> even after a hard stop is gone and the pads wear more evenly and last
>>> longer.
>>>
>>> But, of all my changes the switch to the MIL-H-8328 is the cheapest and
>>> probably the most effective in reducing probably of brake fluid fire.
>>>
>>> YMMV
>>>
>>> Ed
>>>
>>> Ed Anderson
>>>
>>> Rv-6A N494BW Rotary Powered
>>>
>>> Matthews, NC
>>>
>>> eanderson@carolina.rr.com
>>>
>>> http://www.andersonee.com
>>>
>>> http://www.dmack.net/mazda/index.html
>>>
>>> http://www.flyrotary.com/
>>>
>>> http://members.cox.net/rogersda/rotary/configs.htm#N494BW
>>>
>>> http://www.rotaryaviation.com/Rotorhead%20Truth.htm
>>>
>>> -----Original Message-----
>>> From: owner-rv-list-server@matronics.com
>>> [mailto:owner-rv-list-server@matronics.com] On Behalf Of Ed Holyoke
>>> Sent: Wednesday, November 18, 2009 1:36 AM
>>> To: rv-list@matronics.com
>>> Subject: Re: Brakes
>>>
>>>
>>> And Viton O-rings at the calipers. They're rated for higher temps.
>>>
>>> Pax,
>>>
>>> Ed Holyoke
>>>
>>> Kelly McMullen wrote:
>>>>
>>>> If you mean Mil 5606, consider an improvement:
>>>> "Standard" brake fluid for GA aircraft is MIL-H-5606. This fluid has
>>>> been around forever and works fine, but can be improved upon.
>>>> MIL-H-83282 was introduced a few years back and is a synthetic
>>>> upgrade. It performs better in every regard, but of special interest
>>>> is the flash point. 5606 has a flash point of around 225 whereas
>>>> 83282 is around 425. This can be a factor with RVs because there have
>>>> been several reported cases of brake fires on RVs and some have taken
>>>> the whole aircraft with it. Do yourself a favor, upgrade the standard
>>>> MIL-H-5606 to MIL-H-83282: Royco 782 or Aero Shell 31.
>>>>
>>>> Tom Gummo wrote:
>>>>>
>>>>> On the non pressure side, they are nice as you can see if there is
>>>>> RED fluid in the lines.
>>>>>
>>>>> Tom Gummo
>>>>> Harmon Rocket II
>>>>> 370 hours and still smiling.
>>>>>
>>>>>
>>>>> ----- Original Message ----- From: "Kelly McMullen"
>>>>> <kellym@aviating.com>
>>>>> To: <rv-list@matronics.com>
>>>>> Sent: Tuesday, November 17, 2009 6:32 PM
>>>>> Subject: Re: Brakes
>>>>>
>>>>>
>>>>>>
>>>>>> http://www.bonacoinc.com/
>>>>>> I believe they have kits for your RV, but the website has little
>>>>>> info beyond what hose and fittings they have available.
>>>>>>
>>>>>> Norman Hunger wrote:
>>>>>>> Hi everybody, I'm poking around my long dormant resurrected kit and
>>>>>>> noticing the right side optional brake pedal lines are white
>>>>>>> plastic. Does any one sell a kit to do this with nicer lines? Can
>>>>>>> small AN fittings be used here?
>>>>>>>
>>>>>>> I was reading about a brake pedal improvement where the short pivot
>>>>>>> point bolts are replaced with AN3-60 bolts. The result is one bolt
>>>>>>> all the way across the bottom of the pedal instead of a single bolt
>>>>>>> on each side. The better alignment of the single bolt shaft reduces
>>>>>>> the possibility of binding and makes the pedals operate smoother.
>>>>>>> Is this true?
>>>>>>>
>>>>>>> I also read some time back about one complaining about draggy
>>>>>>> brakes and the need to upgrade the springs on the master cylinders
>>>>>>> for stronger ones. Is this true?
>>>>>>>
>>>>>>> And what about the brakes? My Vans wheels and brakes and tires are
>>>>>>> now about ten years old. Is it worth while to install Grove wheels
>>>>>>> and brakes? Do they work better?
>>>>>>> http://www.groveaircraft.com/56-1a.html
>>>>>>>
>>>>>>> Who makes the best tires?
>>>>>>>
>>>>>>> Thanks for your support....
>>>>>>> Norman Hunger
>>>>>>> RV6A Delta BC
>>>>>>> Do not archive
>>>>>>> Nov 17-09 - 15
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> __________ Information from ESET NOD32 Antivirus, version of virus
>>>>>> signature database 4615 (20091117) __________
>>>>>>
>>>>>> The message was checked by ESET NOD32 Antivirus.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>> __________ Information from ESET NOD32 Antivirus, version of virus
>>> signature
>>> database 3267 (20080714) __________
>>>
>>> The message was checked by ESET NOD32 Antivirus.
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
>
>
> __________ Information from ESET NOD32 Antivirus, version of virus signature
> database 3267 (20080714) __________
>
> The message was checked by ESET NOD32 Antivirus.
>
>
>
>
> __________ Information from ESET NOD32 Antivirus, version of virus signature
> database 3267 (20080714) __________
>
> The message was checked by ESET NOD32 Antivirus.
>
>
>
>
> ------------------------------------------------------------------------
>
