REFLECTOR: XL FG Hi Temps/ Siezed Aileron Cable

[Mark Magee]

Sid,
Your pic labeled "Burned Cable" looks eerily like my first seized cable and
the damage it had. I believe I need to begin confirming a pin-hole leak in
the stbd side exhaust manifold. I wonder if this is not a good time to
consider going to 3 straight down pipes per side? Certainly the straight
down pipes have far fewer welds. No?

Mark

On Wed, Nov 9, 2011 at 10:15 PM, sbjknox <sbjknox at earthlink.net> wrote:

> From: "Scott Derrick"
>
>
> Subject: Re: REFLECTOR: XL FG Hi Temps/ Siezed Aileron Cable
>
>
>  Shielding of the exhaust manifold is recommended where the aileron cables
>> come in close proximity to the exhaust stack.
>>
>
> In the past I have had two experiences with siezed aileron cable.  The
> first was from a broken exhaust pipe that sprayed hot gas on the cable
> (also melted aileron servo housing).
> The pipe broke at the point of 'strengthened weld' in the photo "Exhaust
> mod.jpg". The original pipe was designed by monkeys as that long sweeping
> curved portion was un-braced and just waiting to vibrate and break... which
> it did.
> Couldn't move the ailerons but with rudders and  little wind, landing was
> non-event.
>
> I modded the pipe to have a 'vibration damper' (see photo) and added a
> second safety cable.
> I also added a SS heat shield on both sides.
>
> The second time was from a gas-fed engine fire during climb-out.  I had no
> clue something bad was happening back there until the engine started
> missing,  I called the tower and turned back not much concerned at that
> point because I knew I could make the field but when the ailerons started
> getting stiff I knew I had a fire and the pucker-factor jumped an order of
> magnitude!  I made it back with no further problem other than a very rough
> engine from the burned ignition wires (see photo "Burn Damage.jpg").  The
> fire was out by then and the ailerons were locked solid.
>
> Originally  there was no fire sleeve on the cables but of course there is
> now!
> And a "sniffle valve" (spelling?) was installed.  Had one been installed
> before, that fire would not have happened.
>
> Sid Knox
> Oklahoma
>
> Velocity  173 RG  N199RS
> Starduster  N666SK
> KR2         N24TC
> W7QJQ
>
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