---------------------------------------------------------- Zenith601-List Digest Archive --- Total Messages Posted Thu 08/14/08: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:34 AM - Re: Corrosion protection (dalemed) 2. 02:20 PM - Re: Corrosion protection (Thruster87) 3. 03:11 PM - Re: Re: Corrosion protection (David Downey) 4. 10:21 PM - Re: Corrosion protection (Thruster87) ________________________________ Message 1 _____________________________________ Time: 08:34:14 AM PST US Subject: Zenith601-List: Re: Corrosion protection From: "dalemed" carlossa52(at)gmail.com wrote: > ... > Look at it this way: you will not regret having your plane primed, while not having it primed may cause regret. > I'm not so sure of that. I've used primer on my tail surfaces - zinc oxide brushed on some and a self etching spray on some others. I have some regrets because I'm not sure I've done it properly. Have I properly prepared the surface? Have I put on the proper thickness? These are nagging questions that I wouldn't have if I hadn't primed. I've heard that airplane manufacturers used to be (back in the 40s and 50s at least) prohibited from priming surfaces before they were mated. Surfaces were primed after assembly or not at all. These days, we seem to be encouraged to prime before assembly. I guess this is all part of the educational aspects of homebuilding! Cheers, -------- Dale Flying Cessna 170B Building Zenith 601XL Read this topic online here: http://forums.matronics.com/viewtopic.php?p=198570#198570 ________________________________ Message 2 _____________________________________ Time: 02:20:11 PM PST US Subject: Zenith601-List: Re: Corrosion protection From: "Thruster87" I've heard that airplane manufacturers used to be (back in the 40s and 50s at least) prohibited from priming surfaces before they were mated. Surfaces were primed after assembly or not at all. These days, we seem to be encouraged to prime before assembly. I 'm part of an old farts club that restores vintage a/c like the C47 and most of the parts were primed prior to assembly.In the next hangar they are restoring warbirds like the P47 and they were primed.One interesting thing was the way they de-burred the parts by just using a sanding disc as you can still see the scratches [looks like 80-100 grit].Seems like they were in a hurry and it appears [they havn't come across any]they didn't develop any stress fractures due to this method of de-burring. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=198614#198614 ________________________________ Message 3 _____________________________________ Time: 03:11:24 PM PST US From: David Downey Subject: Re: Zenith601-List: Re: Corrosion protection just remember that they did not understand fatigue well until after the war in the beginning of the jet era. Also, the old transports and fighters wer e "throwaway" hardware with very short specification lives. I don't think I would allow a bad practice then to define/over ride todays understanding a nd evidence. David L. Downey Harleysville-(SE) PA, USA --- On Thu, 8/14/08, Thruster87 wrote: From: Thruster87 Subject: Zenith601-List: Re: Corrosion protection I've heard that airplane manufacturers used to be (back in the 40s and 50s at least) prohibited from priming surfaces before they were mated. Surfaces were primed after assembly or not at all. These days, we seem to be encouraged t o prime before assembly. I 'm part of an old farts club that restores vintage a/c like the C47 and most of the pa rts were primed prior to assembly.In the next hangar they are restoring warbird s like the P47 and they were primed.One interesting thing was the way they de-burred the parts by just using a sanding disc as you can still see the scratches [looks like 80-100 grit].Seems like they were in a hurry and it appears [they havn't come across any]they didn't develop any stress fractures due to this method of de-burring. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=198614#198614 =0A=0A=0A ________________________________ Message 4 _____________________________________ Time: 10:21:03 PM PST US Subject: Zenith601-List: Re: Corrosion protection From: "Thruster87" Early 50's models of the de Havilland Comet suffered from catastrophic metal fatigue, causing a string of well-publicised accidents. As they found out how stress risers are a lot more critical on pressurized aircraft but do not under estimate there importance. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=198688#198688 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message zenith601-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Zenith601-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/zenith601-list Browse Digests http://www.matronics.com/digest/zenith601-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.