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09-11-2016, 11:05 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by Chrysopelea
Anyone else keep breaking safety wires and springs too? I just had to replace the safety wire on 3 of my springs.
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If you are breaking safety wire on the muffler, it is being installed incorrectly.
The primary purpose of the safety wire is to prevent a broken spring from exiting the airplane (particularly important in a pusher configuration).
The wire should be installed loose enough to allow system expansion/contraction (that is why springs are used). If the wire is breaking, it is likely being installed way too tight.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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09-12-2016, 04:45 AM
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Join Date: Feb 2011
Location: Brandon, FL
Posts: 68
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On my old 2-stroke Rotax the springs would only last 25 to 50 hours until someone told me about putting a bead of hi-temp silicone on and that solved the problem.
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09-12-2016, 06:43 AM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,066
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Has anyone tried stainless steel exhaust springs from Aircraft Spruce? My springs at 160 hours look pretty bad...
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Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622 
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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09-12-2016, 07:48 AM
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Join Date: Nov 2008
Location: Gloversville, NY
Posts: 1,587
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Quote:
Originally Posted by Piper J3
Has anyone tried stainless steel exhaust springs from Aircraft Spruce? My springs at 160 hours look pretty bad...
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Yes, I replaced the original springs with the Spruce springs at two years and 155 hours. The originals were getting very rusty and showed some wear, despite using the recommended RTV to dampen vibrations. The new springs now have about the same hours on them as the originals had and they are holding up pretty well.
As to safety wiring the springs, I guess that is personal choice if you like the belt AND suspenders theory. Personally I don't see the need for it in the RV-12 installation.
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John Peck, CFII, A&P, EAA Tech Counselor, Flight Advisor.
?Master Pilot? Award, UFO Member.
RV-12 N37JP 120176 Flying since 2012.
One Week Wonder Build Team, OSH 2018.
VAF paid through 10/2019.
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09-12-2016, 08:01 AM
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Join Date: Jan 2016
Location: santa rosa CA
Posts: 90
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On my safety wired springs, I've replaced 2 springs so far, and fixed 4 safety wires, all were RTV'd (before and after), save for the last one because I didn't have any RTV handy when putting the cowling back on.
I double wrapped my safety wires, once outside the spring, and once through the spring, and pulled them tight, but not guitar string tight. Tight enough so if the spring were to break, things wouldn't move very much that's for sure.,
I recently adjusted my prop pitch (blades were over 2.5 degrees off from each other) and it SERIOUSLY smoothed things out, and I think this may have been the reason my springs and safety wires were breaking at what seems like a fast rate.
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09-12-2016, 10:36 PM
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Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,820
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500 hours and the springs look great. Only one VR failure, two EGT failures, only one tire replaced and now finally a squirrelly oil pressure sensor. By the measure of this forum my 12 is living a charmed life!
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