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  #1  
Old 03-07-2013, 09:40 PM
Flying again!'s Avatar
Flying again! Flying again! is offline
 
Join Date: Aug 2011
Location: Keller, TX
Posts: 423
Default Melted Control Cables

I just did a condition inspection and found that the prop control cable on my -10 had melted the outside cover (it passes along the left side of the sump and up to the govenor at the front left of the O-540.

Troy Thompson who signed off on the inspection said he thought it was from heat soak. He said during a group X-country one of the RV-8s had the throttle freeze after a refueing stop. Apparently it got so hot that the inner liner melted and froze the cable.

Mine was not that bad and it still functions normally. However, I bought HeatShield 270012 Thermaflect Sleeve 1/2" ID x 3' Heat Shield Sleeve for $16 from Amazon. It is rated for 1100 degrees F. I saw some evidence of the same with the throttle and mixture cables too.

The strange thing is that the -10 has over 360 hours and I have owned it for 18 months and over 150 hours. I check the engine very carefully at each oil change and did not see any damage at the end of October during the last oil change.

Here a a couple of pictures.



[IMG][/IMG]
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  #2  
Old 03-08-2013, 12:18 AM
tim2542 tim2542 is offline
 
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Location: Redding,Ca
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Default Ground?

Is there a chance your starter current is flowing down that cable? Doesn't look like there's a real source of heat close by.
Tim
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  #3  
Old 03-08-2013, 12:49 AM
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MauiLvrs MauiLvrs is offline
 
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Quote:
Originally Posted by tim2542 View Post
Is there a chance your starter current is flowing down that cable? Tim
That would be much more likely than heat soaking...
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  #4  
Old 03-08-2013, 01:43 AM
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RV10inOz RV10inOz is offline
 
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Location: Brisbane Qld. Aust.
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Default

No.

You would really know about it every start if it was.

My prop control cable is the same. Actually it is worse. It seems to only affect the outer plastic. The inside is working perfect.

Dont stress.

BTW ours has 750 hours on it and the cable was like this from somewhere sub 100 hours. I can't recall it not being that way.
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  #5  
Old 03-08-2013, 07:06 AM
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rleffler rleffler is offline
 
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Location: Delaware, OH (KDLZ)
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Default

This seems to be a common theme amoung RV-10s that have been flying for awhile.

Tim has a good write up on his site here.

Cablecraft has another level of sheathing (Black) that adds another 50-80 degrees of protection over the green sheath models that Vans sells.

I'm just finishing my FWF and will problem add the orange firesleeve as well for extra protection.
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  #6  
Old 03-08-2013, 09:03 AM
danP danP is offline
 
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Location: Monroe, La
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check to see if you have a exhaust leak
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  #7  
Old 03-08-2013, 10:06 AM
vic syracuse vic syracuse is offline
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Default Black cables

I've replaced all of mine with the black ones mentioned above for the very same reasons.

Vic
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  #8  
Old 03-08-2013, 10:07 AM
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DanH DanH is offline
 
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Default

Recently found some melted green sheathing on one of my cables....after 220 hours. Looks like radiant heating (and your pipe is about the same distance), but I have no idea why it has showed up after this much run time. Maybe a cascading failure.....first you melt a thin spot and expose some steel, which allows the darker steel to absorb more radiant heat, which raises the temperature of the remaining plastic sheath?

Anyway, it's now wrapped in fiberfrax and shiny reflective aluminum tape.
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  #9  
Old 03-08-2013, 10:54 AM
brad walton brad walton is offline
 
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Location: Cypress, TX
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Default Express sleeve

Aircraft Spruce sells a product called Express Sleeve, PN 09-02060, which is a high temperature insulation with reflective mylar the uses hook and loop closure so you can put it around a cable, hose or wire without feeding it from one end. I have heard of RV-8s having melting problems on their throtle and mixture cables, so I put this product over mine where they are closest to the exhaust. Seems to work well.
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  #10  
Old 03-08-2013, 10:59 AM
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rleffler rleffler is offline
 
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Quote:
Originally Posted by brad walton View Post
Aircraft Spruce sells a product called Express Sleeve, PN 09-02060, which is a high temperature insulation with reflective mylar the uses hook and loop closure so you can put it around a cable, hose or wire without feeding it from one end. I have heard of RV-8s having melting problems on their throtle and mixture cables, so I put this product over mine where they are closest to the exhaust. Seems to work well.
Interesting product.

I guess I'll need to contact ACS to see what length you get for $27.95. The text states it comes in 3' and 12' lengths, but the purchase box just has a quanity of 1 by default. If that's the per foot price, it's expensive.
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