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  #1  
Old 09-18-2022, 07:23 PM
Flying Canuck Flying Canuck is offline
 
Join Date: Jan 2015
Location: Red Deer, Alberta, Canada
Posts: 671
Default Safety Wiring my prop

I had my Whirlwind 200RV prop away for tear down and reinstalled it this afternoon. Managed to get it on and torqued without too much trouble. I then tried to safety wire the bolts and got the first bolt wired but then I couldn't get the 0.032 wire to feed through the hole in the bolt head. It's the welded nut style bolt head with short tubes connecting to the hole in the bolt shank. I was able to get 0.025 into the hole in the middle, but not the required 0.032.

Are there any proper ways to deal with this? I was thinking of finding a 0.040" drill bit and reaming a path through, is this appropriate? I can't replace the bolts since they are factory inserted.

I'll call Whirlwind tomorrow, but just thought someone here may have encountered this and worked through it (sorry, pun intended I guess).
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Claude Pitre
RV-9A #91081, C-GCPT
Dynon SkyView HDX, IO-320 and WW 200RV C/S. Flying as of August 6, 2018

Added GPS 175 and authorized for IFR April 1, 2021

Interactive map of all of my flights here
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  #2  
Old 09-18-2022, 09:24 PM
schristo@mac.com's Avatar
schristo@mac.com schristo@mac.com is offline
 
Join Date: Sep 2007
Location: WA
Posts: 998
Default Mark it when torqued…

Mark the position when torqued then back it off as needed to get the safety wire through, then tighten back to the mark.
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Stephen

RV7 powered by a lycoming thunderbolt IO-390
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  #3  
Old 09-18-2022, 09:56 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 1,377
Default

Sounds like the roll pins that Hartzell props use, and they specify .032 safety wire though the roll pins. I wouldn’t drill the roll pins for .040.. you’ll probably break the drill bits trying it.
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  #4  
Old 09-18-2022, 10:15 PM
scsmith scsmith is offline
 
Join Date: Jan 2008
Location: Ashland, OR
Posts: 3,259
Default

DO NOT try to drill the holes.

You can back the nut off, feed safety wire through, and then re-torque, or re-tighten to a mark.

Quitely under our breath, I can admit that lots of people believe it or not do not safety-wire their props. But with the technique described above, it is not too hard, and personally I can't image not doing it.
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Aeronautical Engineer
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IO-360 A1A
WW 200RV
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  #5  
Old 09-18-2022, 10:21 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
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Default

Another trick for feeding the safety wire is to make a loop of wire and use it like a snare tool and place the loop under the roll pin. Then you feed a straight piece though the bolt, and pressing the straight piece, you pull the snare and it brings the wire with it.
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  #6  
Old 09-19-2022, 12:24 AM
erich weaver's Avatar
erich weaver erich weaver is offline
 
Join Date: Aug 2006
Location: santa barbara, CA
Posts: 1,834
Default

Love my WW prop, but boy do I hate safety wiring the prop bolts.

I asked WW if I could use Nordlock washers as an alternative but they do not recommend it for the 200RV prop. Not sure what the reasoning was.
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  #7  
Old 09-19-2022, 12:30 AM
Flying Canuck Flying Canuck is offline
 
Join Date: Jan 2015
Location: Red Deer, Alberta, Canada
Posts: 671
Default

Thanks for the quick feedback, drilling seemed too brute force to me, glad to see that there's a way to do it right. I too can't imagine not safety wiring the prop. It's a shame that it's difficult, but it's got a very important job.
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Claude Pitre
RV-9A #91081, C-GCPT
Dynon SkyView HDX, IO-320 and WW 200RV C/S. Flying as of August 6, 2018

Added GPS 175 and authorized for IFR April 1, 2021

Interactive map of all of my flights here
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  #8  
Old 09-19-2022, 01:39 AM
rv8ch's Avatar
rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
Posts: 5,007
Default

Quote:
Originally Posted by erich weaver View Post
Love my WW prop, but boy do I hate safety wiring the prop bolts.

I asked WW if I could use Nordlock washers as an alternative but they do not recommend it for the 200RV prop. Not sure what the reasoning was.
I think one of the advantages of Nord-Lock washers and one of the disadvantages of safety wire is that it's very easy to check to make sure a bolt is still torqued properly with the Nord-Lock.

I've seen bolts that have not moved, but became loose over time due to compression of the materials. But what a hassle to remove safety wire just to find out all the nuts/bolts are still tight!

My plan is to switch to Nord-Lock wherever not disapproved, so I took out a second mortgage on my house and bought an assortment of sizes from ACS.
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  #9  
Old 09-19-2022, 06:25 AM
maxmirot maxmirot is offline
 
Join Date: Feb 2022
Location: Hereford
Posts: 92
Default

Nord-lock with Torque seal should cover inspection concerns.
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  #10  
Old 09-19-2022, 08:21 AM
Walt's Avatar
Walt Walt is offline
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 6,905
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Quote:
Originally Posted by scsmith View Post
Quitely under our breath, I can admit that lots of people believe it or not do not safety-wire their props. But with the technique described above, it is not too hard, and personally I can't image not doing it.
Put me in that “believe it or not” camp, waste of time IMO. Put a torque wrench on them at CI if you’re worried about it.
I’ve seen sheared bolts that would visually appear fine, until you put a wrench on them.
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EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
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RV7A built 2004, 2000+ hrs, New Titan IO-370, Bendix Mags, MTV-9 prop
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Last edited by Walt : 09-19-2022 at 08:28 AM.
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