REFLECTOR: Aileron Cables(Fire-sleeving)
michalk
michalk at awpi.com
Tue Apr 10 12:19:37 CDT 2007
Thank you.
I have always wondered how the laws of thermodynamics were allowing us
to protect those cables.
I think ceramic coating the exhaust is easier, cheaper, lighter and more
reliable than installing heat shields.
I placed a temperature dot on the firewall which is less than an inch
from the turbo exhaust. The dot turns colors at 140C. I have had five
engine runs so far and the dot has not changed colors.
It will be interesting to see what happens when I start making boost.
Laurence Coen wrote:
> All,
>
> Fire-sleeving will work on things like liquid carrying lines, (oil and
> fuel), because the liquid flow cools the line and the fire-sleeve slows the
> transfer of heat into the line. Putting it on the aileron cables will slow
> the melt-down but not prevent it. Using a heat shield is a better solution.
>
> Larry Coen
> N136LC
>
> ----- Original Message -----
> From: "Keith Hallsten" <KeithHallsten at quiknet.com>
> To: "'Velocity Aircraft Owners and Builders list'" <reflector at tvbf.org>
> Sent: Monday, April 09, 2007 3:19 PM
> Subject: Re: REFLECTOR: Aileron Cables
>
>
>> About year 2000 it was determined experimentally (at the moment I forget
>> by
>> who) that the original aileron push-pull cables could seize if overheated
>> (by say, an exhaust leak) in flight. [The plane was landed successfully
>> with rudders alone.]
>>
>> This got the collective attention of the reflectorites and a bunch of us
>> went in on a group buy of higher- temperature-rated push-pull cables. At
>> that time it was also emphasized by all that we should be fire-sleeving
>> the
>> portion of the cables that is on the engine side of the firewall. I
>> believe
>> that Velocity subsequently began providing a higher temperature-rated
>> push-pull cable for their kits, but I'm not sure about that.
>>
>> I don't know if anyone tested the original push-pull cables with
>> firesleeve
>> in a fire or major exhaust leak (no one wanted to volunteer), so it's not
>> known whether that is sufficient. You could be that volunteer and let the
>> rest of us know how it works out!
>>
>> Keith Hallsten
>>
>>
>> -----Original Message-----
>> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
>> Behalf Of lawrence epstein
>> Sent: Monday, April 09, 2007 4:37 PM
>> To: reflector at tvbf.org
>> Subject: REFLECTOR: Aileron Cables
>>
>> I know that years ago it was determined that the Aileron push-pull cables
>> had to be fire sleeved on the engine side of the firewall. I have the
>> original cables. Do these need to be replaced entirely, or can I just put
>> fire sleeve over them?
>>
>> Larry Epstein
>>
>>
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>
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