REFLECTOR: Turbo heat was Re: Aileron Cables(Fire-sleeving)

[Brian Michalk]

I'm turbonormalizing now.  I don't have plans to make any boost until a 
few hours into flight testing.  No boost, no heat.  So far the 
temperature dots like the ceramic coating.


Scott Derrick wrote:

> That turbo is going to get white hot when producing boost..  Its an 
> awesum sight watching a turbo at night!
>
> Less than an inch, whoooo thats close for a turbo!  1700 degrees!
>
> I'd do some long(3-5 min) full power runups and as long a high 
> speed(full power) taxi tests as you can to verify you won't cook the 
> firewall.
>
> Scott
>
> michalk wrote:
>
>>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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>>
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>>
>>  
>>
>
>-- 
>
>-
>    The most effectual engines for [pacifying a nation] are the public papers... [A despotic] government always [keeps] a kind of standing army of newswriters who, without any regard to truth or to what should be like truth, [invent] and put into the papers whatever might serve the ministers.
>
>    Thomas Jefferson to G. K. van Hogendorp
>    Oct. 13, 1785. (*) ME 5:181, Papers 8:632 
>  
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