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  #16  
Old 02-12-2007, 02:48 PM
SteveWrightNZ SteveWrightNZ is offline
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Quote:
Originally Posted by Marc Zeitlin View Post
Assuming that you use flexible lines to attach sensors, what then would be the objection to aluminum fittings? That's the question.
I still would not trust them, for the same reason. Also, they cannot be tightened properly since you will destroy them, then you are forced to use overt amounts of lubricants such as thread tape and other nasty teflon sealants(sic). Steel fittings can be wound up tight and hit with the hammer and they still wont break.

You don't have to use alloy fittings for the small oil and fuel lines - steel ones arent that much heavier as the fittings are small. Larger coolant line fittings are much wider and less likely to have a resonant point.

S
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  #17  
Old 02-12-2007, 03:30 PM
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rv6ejguy rv6ejguy is offline
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On turbine engines, pretty much everything is steel fittings with stainless line. While it is good to look at preventing fuel and oil leaks through better hardware, it is important to look at simple things like SCAT hose connections running through the firewall with aluminum valves for cabin heat. This will melt through in seconds and allow a high volume of smoke and flames to propagate through.

A recent RV ground fire caused by a fuel leak melted through the belly skin in less than 45 seconds. In flight, if you can't stop the flow of fuel, you are probably dead from a fuel fire. Any and all precautions should be taken.
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  #18  
Old 02-12-2007, 03:31 PM
Marc Zeitlin Marc Zeitlin is offline
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Originally Posted by SteveWrightNZ View Post
I still would not trust them, for the same reason. Also, they cannot be tightened properly since you will destroy them, then you are forced to use overt amounts of lubricants such as thread tape and other nasty teflon sealants(sic).
You have obviously never used AN 37 degree flared fittings.
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  #19  
Old 02-12-2007, 03:37 PM
SteveWrightNZ SteveWrightNZ is offline
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You have obviously never used AN 37 degree flared fittings.
obviously, but [rant deleted]* sigh.

* yep, a whole paragraph.

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  #20  
Old 02-13-2007, 06:53 PM
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MarbleTurtle MarbleTurtle is offline
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Any problem with steel fittings inserted into aluminum surrounds?
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