---------------------------------------------------------- RV8-List Digest Archive --- Total Messages Posted Sat 09/06/08: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:24 PM - Dimpling of Elevator Trim Tab Piano Hinge ???? (Garey Wittich) 2. 04:06 PM - Re: Dimpling of Elevator Trim Tab Piano Hinge ???? (Carl Froehlich) 3. 05:16 PM - Re: Dimpling of Elevator Trim Tab Piano Hinge ???? (Gordon or Marge) ________________________________ Message 1 _____________________________________ Time: 02:24:34 PM PST US From: Garey Wittich Subject: RV8-List: Dimpling of Elevator Trim Tab Piano Hinge ???? Greetings: Ref: Elevator Trim Tab PIANO HINGE Anybody have any idea why Vans recommends Dimpling the Elevator Skin, machine countersinking the Trim Tab Spar and then attaching the Elevator Trim Tab Piano Hinge ?? Why not dimple the Elevator Skin (per Vans directions), DIMPLE the Trim Tab Spar and DIMPLE the Piano Hinge ?? This does away with the machine countersinking the Elev Trim Tab SPAR ???? Just wondering. Thanks, Garey ________________________________ Message 2 _____________________________________ Time: 04:06:16 PM PST US From: "Carl Froehlich" Subject: RE: RV8-List: Dimpling of Elevator Trim Tab Piano Hinge ???? The piano hinge cannot be dimpled. The material used to make it does not dimple well. The way the plans tell you to do this works well. Carl Froehlich RV-8A (450 hrs) RV-10 (fuselage) -----Original Message----- From: owner-rv8-list-server@matronics.com [mailto:owner-rv8-list-server@matronics.com] On Behalf Of Garey Wittich Sent: Saturday, September 06, 2008 5:24 PM Subject: RV8-List: Dimpling of Elevator Trim Tab Piano Hinge ???? Greetings: Ref: Elevator Trim Tab PIANO HINGE Anybody have any idea why Vans recommends Dimpling the Elevator Skin, machine countersinking the Trim Tab Spar and then attaching the Elevator Trim Tab Piano Hinge ?? Why not dimple the Elevator Skin (per Vans directions), DIMPLE the Trim Tab Spar and DIMPLE the Piano Hinge ?? This does away with the machine countersinking the Elev Trim Tab SPAR ???? Just wondering. Thanks, Garey ________________________________ Message 3 _____________________________________ Time: 05:16:35 PM PST US From: "Gordon or Marge" Subject: RE: RV8-List: Dimpling of Elevator Trim Tab Piano Hinge ???? -----Original Message----- From: owner-rv8-list-server@matronics.com [mailto:owner-rv8-list-server@matronics.com] On Behalf Of Garey Wittich Sent: Saturday, September 06, 2008 5:24 PM Subject: RV8-List: Dimpling of Elevator Trim Tab Piano Hinge ???? Greetings: Ref: Elevator Trim Tab PIANO HINGE Anybody have any idea why Vans recommends Dimpling the Elevator Skin, machine countersinking the Trim Tab Spar and then attaching the Elevator Trim Tab Piano Hinge ?? Why not dimple the Elevator Skin (per Vans directions), DIMPLE the Trim Tab Spar and DIMPLE the Piano Hinge ?? This does away with the machine countersinking the Elev Trim Tab SPAR ???? Just wondering. Thanks, Garey Garey: You can dimple the hinge. The material is fairly soft but the tendency when dimpling is to distort the hinge leaf. It can be difficult to straighten and the hole spacing can be compromised. Even leaving the hinge pin in place and the opposing leaf attached is not sufficient if the dimpling is too rambunctious. There is plenty of material for machine countersinking. With regard to your earlier post about panel oilcanning, I have noticed the problem and have no good explanation for it. I suspect the sequence of riveting in a long string plays a role and have had best results by starting to rivet in the center of a long string and working toward each end. At least you don't chase all the tolerances to one end that way. Perhaps the way the sheet metal has been handled enters into it. It doesn't take much to create a tiny stretch in the sheet which could cause such behavior. Gordon Comfort N363GC ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv8-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV8-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/rv8-list Browse Digests http://www.matronics.com/digest/rv8-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.