---------------------------------------------------------- RV9-List Digest Archive --- Total Messages Posted Sun 04/29/07: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:22 PM - fin (Chenoweth) 2. 07:01 PM - Re: fin (Harold Kovac) ________________________________ Message 1 _____________________________________ Time: 04:22:38 PM PST US From: "Chenoweth" Subject: RV9-List: fin Let me start with the questions first and then the story. The question: Is the rear spar of the fin straight enough when a straight edge laid along the hinge brackets is aft of the center one by about 1/32 inch? How about if it's out of line by more than 5/64 but less than 3/32? These are apparently my two choices. The story: If I mount the fin per the drawing, front spar ahead of hold-down bracket and fin pushed forward so that the hold-down bracket just contacts the flanges on the fin's bottom ribs, the rear fin spar is firmly against the 712 bulkhead but the out of true is the over 5/64 amount I mentioned above. Which, by the way, is the amount it turned out to be out of true when I built it. At that point the rudder seemed to work ok with it. If, however, I mount the fin with the forward spar behind the hold-down bracket and with the bracket just touching the flange of the fin's bottom rib, the rear fin spar does not seat against the 712 - it's about 1/32 aft of it at its top. But I get the less than 1/32 out-of-true measurement in the hinge line. Based on the way I'm making the up elevator stop having the rear fin spar not contact the 712 is not a problem because I can position the stop slightly aft to make good contact with the spar and still have it function properly with the elevator horns. Any answers/comments you'd care to make would be very much appreciated. Bill RV9 Albion, Maine ________________________________ Message 2 _____________________________________ Time: 07:01:58 PM PST US From: "Harold Kovac" Subject: Re: RV9-List: fin Hi Bill, I checked mine with a drilled acorn/cap nut, string thru the drilled hole with a weight. Mine came out with about a 1/64th" off center error.....seems easier than a straight edge & worked with flaps too. Harold, RV9A Fuselage wiring ----- Original Message ----- From: Chenoweth To: rv9-list@matronics.com Sent: Sunday, April 29, 2007 7:21 PM Subject: RV9-List: fin Let me start with the questions first and then the story. The question: Is the rear spar of the fin straight enough when a straight edge laid along the hinge brackets is aft of the center one by about 1/32 inch? How about if it's out of line by more than 5/64 but less than 3/32? These are apparently my two choices. The story: If I mount the fin per the drawing, front spar ahead of hold-down bracket and fin pushed forward so that the hold-down bracket just contacts the flanges on the fin's bottom ribs, the rear fin spar is firmly against the 712 bulkhead but the out of true is the over 5/64 amount I mentioned above. Which, by the way, is the amount it turned out to be out of true when I built it. At that point the rudder seemed to work ok with it. If, however, I mount the fin with the forward spar behind the hold-down bracket and with the bracket just touching the flange of the fin's bottom rib, the rear fin spar does not seat against the 712 - it's about 1/32 aft of it at its top. But I get the less than 1/32 out-of-true measurement in the hinge line. Based on the way I'm making the up elevator stop having the rear fin spar not contact the 712 is not a problem because I can position the stop slightly aft to make good contact with the spar and still have it function properly with the elevator horns. Any answers/comments you'd care to make would be very much appreciated. Bill RV9 Albion, Maine ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv9-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV9-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/rv9-list Browse Digests http://www.matronics.com/digest/rv9-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.