Original Posted By: jmcnarry(at)techplus.com (John McNarry)
Subject: Pietenpol-List: Re: Burnt props and grade 5 bolts.>LAUREN;> The threads in the Ford crank flange are COARSE thread, hence the use of>the commercial bolts. The two engine mfgr's , Lycoming and Continentalboth>use commercial bolts on their engines as do many component mfgrs.>(alternators, pumps & so on). These two Piets otherwise are reported to be>VERY nice!> You said the VW guys have had this problem for years while using the>direct drive I assume?>This friction is from the bolts not being torked enough.......I will pass>that on to see what reaction I get. Guys, this is the kind of info I need,>keep it coming!>Earl Myers>-----Original Message----->From: Lauren Williams >To: Pietenpol Discussion >Date: Saturday, October 02, 1999 10:50 PM>Subject: Burnt props and grade 5 bolts.>>>Haven't we seen this before?>>The Volkswagen engined guys have had this problem for years. They have>lost a few props too. If they don't keep their prop bolts tight, the>surface against the driving flange will char because of the friction>caused by movement between the prop and flange..>>Grade 5 bolts!!!! That's common, autoparts store stuff. I thought that>the word had gotten to everyone about using aircraft (AN) hardware in>all structural applications in homebuilts, regardless of what the 1930s>plans say. Certainly the prop bolts are the most structural fastener in>the whole plane. There are wonderful aircraft propeller bolts availiable>for all dimensions with fine threads, drilled heads for safety wire and>huge strength.>>I am afraid that I would want to look over the rest of the plane and see>if the lift and cabane strut attach fittings, the wire attach fittings,>etc. had correct AN fasteners.>>I wonder what the FAA inspector looked at on this aircraft if he didn't>look at the type of fasteners being used. A first time builder, who>hasn't been following the literature for 20 years can be forgiven a>mistake like this. What is the inspector's excuse?>>I am building a Pietenpol so that I can experience and share the>adventures of the early day aviators. I really have no intrest in>reexperiancing their "misadventures".>>I guess this got me excited!>>Lauren>>________________________________________________________________________________