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  #11  
Old 09-19-2010, 11:12 PM
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Snowflake Snowflake is offline
 
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Quote:
Originally Posted by rocketbob View Post
Got some photos today in an email that showed the root cause of Relentless losing its prop ... Loss of oil pressure caused the prop to run away.
Now that's what I call a runaway prop!

Are those photos you can share? I'd be interested...
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  #12  
Old 09-19-2010, 11:39 PM
asav8tor asav8tor is offline
 
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Steel. You can get them at a hydraulic supply dealer.... Many of them in the bins say "china". I pass on those however.
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  #13  
Old 09-20-2010, 02:54 AM
Captain Avgas Captain Avgas is offline
 
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Quote:
Originally Posted by Toobuilder View Post
I rarely see anything BUT aluminum used in the oil cooler or engine case.
Well that's true of most RVs, but that's simply because that's what Vans supplies with their FWF kits. As always Vans components are purely price driven. In the end it's cheaper (and easier) for builders to use what they have been given rather than discard their fittings and source the much more expensive AN steel fittings (virtually twice the price).

Personally I opted for steel. And thanks to RocketBob for the heads up.
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  #14  
Old 09-20-2010, 04:48 AM
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Thanks everyone for your replies. Based on everyone's input I decided to go with steel oil cooler fittings. The failure on Relentless sealed the deal. Thanks again.
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  #15  
Old 09-21-2010, 05:11 PM
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Location: Waco, Texas
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Has anyone experienced corrosion when using steel fittings in an aluminum hole? I'm considering using steel fittings to terminate my hard aluminum lines at the firewall pass-thru. But I am a bit concerned about corrosion forming in the fuel line and going undetected for long enough for it to cause some serious problems.

Thanks,
Phil
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  #16  
Old 09-21-2010, 09:09 PM
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DCat22 DCat22 is offline
 
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Quote:
Originally Posted by Snowflake View Post
Now that's what I call a runaway prop!

Are those photos you can share? I'd be interested...
I think that is the plane in these pics? http://www.vansairforce.com/communit...2762&page=2#17 (while the thread is here)

Also, showing the fitting: http://www.kevineldredge.com/Network...ensive!!!.html
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  #17  
Old 10-05-2010, 12:29 PM
PaulR PaulR is offline
 
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Location: Geneva, AL
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Default General Consesus FWF

I'm getting ready to hang my engine and was reviewing this thread. Is the general consensus to use steel fittings in all the required places in the Accy case? If so, can one find the special fittings for the OP and FP lines in steel, or do you have to make them? I have them for the oil cooler, but just thought about the rest of them.

Thanks
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  #18  
Old 10-05-2010, 02:14 PM
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skylor skylor is offline
 
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Default Not From a Broken Fitting!

Quote:
Originally Posted by rocketbob View Post
Got some photos today in an email that showed the root cause of Relentless losing its prop was due to oil starvation from a broken aluminum AN fitting for one of the oil cooler lines on the accessory case. Loss of oil pressure caused the prop to run away.
I should have rebutted the above statement sooner. I spoke to the crew chief for Relentless a couple of days after their spectacular engine failure. They DO NOT believe that the broken oil fitting in the back of the accessory case caused the failure. They have pretty strong evidence that the first failure was actually the oil filter mount casting (stock lycoming). They think that the filter mount failed from fatigue from the "G" loads and it and the filter fell onto the fitting/oil hose below it. The filter and the broken part of the aluminum casting were found somewhere out on one of the runways near the location where the oil loss was experienced. There was a witness mark on the filter where it was believed to have hit the oil fitting. Also note that they were using one of the "long" filters in this plane which would certainly increase the cantilevered loads on the filter mount.

Skylor
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  #19  
Old 10-05-2010, 03:09 PM
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DanH DanH is offline
 
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The crew chief is probably confused about the order of events. Failure of an oil filter casting due to flight G loads is unlikely. Failure due to the very high accelerations of a severe vibratory inbalance is quite possible:

http://www.relentlessairracing.com/z...&w=1905&h=1057
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  #20  
Old 10-05-2010, 03:32 PM
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skylor skylor is offline
 
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Quote:
Originally Posted by DanH View Post
The crew chief is probably confused about the order of events. Failure of an oil filter casting due to flight G loads is unlikely. Failure due to the very high accelerations of a severe vibratory inbalance is quite possible:

http://www.relentlessairracing.com/z...&w=1905&h=1057

Are you sure about that? The filter mount casting was pretty thin in one of the mounting bolt locations, and the broken casting showed some discoloration in that particular location as if there may have been a crack propagating for some time prior to the failure. Since the filter itself is cantilevered off of the mount and they were using the long filter, the mount would certainly see significant loads during in flight "G" loads.
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