REFLECTOR: Aileron Cables(Fire-sleeving)

[michalk]

I am taking a different approach.

My cables to the engine do not have any plastic sleeving.  I ordered 
them specifically that way so that heat melting things would not be an 
issue.  The aileron cables are a different story.

Rather then wrap things outright, I am going to measure the various 
temperatures and then apply fixes where needed.  I took care in the 
initial plans which includes ceramic coatings, and hope that is all I 
will need.  I have made a heat shield for the wire bundle, but am not 
sure if I will use it if the temperatures stay low.

Alex wrote:
> Brian- are you running exhaust wrap on your turbo? I have started to install
> it on mine as well, has an aluminum foil-like exterior- will probably wrap
> the cables in the same material for good measure- probably the radiant heat
> from exhaust is not so much of a problem as an actual fire back there-
> although I would figure that the metal cables would be fairly functional
> even if the plastic melted off-  
> 
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> Behalf Of michalk
> Sent: Tuesday, April 10, 2007 12:20 PM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: Aileron Cables(Fire-sleeving)
> 
> 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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