---------------------------------------------------------- RV-List Digest Archive --- Total Messages Posted Sun 01/25/09: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:42 AM - Re: Re: Routing Elevator Trim Tab Servo Wires (Mike Schulz) 2. 06:44 AM - vinyl adhesive remover (Frazier, Vincent A) 3. 08:26 AM - Re: Improvements to "Hinged" wingtip installation (John Barrett) 4. 09:36 AM - Re: Routing Elevator Trim Tab Servo Wires (Charles Kuss) ________________________________ Message 1 _____________________________________ Time: 06:42:00 AM PST US From: "Mike Schulz" Subject: RE: RV-List: Re: Routing Elevator Trim Tab Servo Wires I'm not that far along yet so I hope this doesn't sound dumb but what does the wire go to, and what does it do? Mike Schulz Pro Fish Enterprises, LLC 4878 Edgewater Drive Mound, MN 55364 612-590-8604 -----Original Message----- From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of Matt Dralle Sent: Sunday, January 25, 2009 1:09 AM Subject: RV-List: Re: Routing Elevator Trim Tab Servo Wires At 10:01 PM 1/24/2009 Saturday, you wrote: > >Greetings: > >Looking for a better solution than routing the Trim Tab Servo wires thru the hole in the Elevator Spar (where the long Servo Motor Screw goes). > >Does anybody have any pictures or diagrams of the Wire Routing of the Trim Tab Motor wires in the Elevator to the Horizontal STABILIZER to the fuselage. > >Not much given on this subject on Matronics. > >Thanks, Garey Santa Monica, CA Hi Garey, I just did this task. I simply drilled a 1/4" hole above the servo screw hole and added a little black plastic bushing. Attached is a picture. Best regards, Matt Dralle RV-8 #82880 N998RV (res) Building Time Since July 2008: 728.75 Hours ________________________________ Message 2 _____________________________________ Time: 06:44:21 AM PST US Subject: RV-List: vinyl adhesive remover From: "Frazier, Vincent A" **** SNIP ***** Subject: RV-List: Removing White Vinyl Protective Material Guys, Do you have good shortcuts for removing this stuff? I have material on the leading edges of both wings. I've been using a heat gun with a tongue depressor that has been squared off and sharpened on sander. The project is slow - I can removed 1/4 to 1/2 wide strip with each pass. The wood does not scratch the aluminum but there is a very thin adhesive film still on the wing. I plan to use MEK outside later this spring to remove the residuals. (It's -10 here in MN this morning.) The archives haven't yielded any good suggestions... Thanks in advance for any ideas. Joe ****** SNIP ******* I use an adhesive remover in my graphics business that works great to remove vinyl adhesive and other sticky stuff. It is safe to use, much less dangerous than MEK or other solvents, although technically it is flammable. The really nice feature of this product is that it is specifically designed to be safe on plexiglas. Contact me directly if you want to order some. Vince Frazier vfrazier@usi.edu www.flyboyaccessories.com ________________________________ Message 3 _____________________________________ Time: 08:26:14 AM PST US From: "John Barrett" <2thman@cablespeed.com> Subject: RV-List: Re: Improvements to "Hinged" wingtip installation I read with interest the discussion presented I think by Mark Phillips of a technique for using hinges on the wingtip to avoid the multiple screws for attachment apparatus. In the Lancair world many have been using a similar technique for several years and it has been shown to be much more esthetic, lighter weight and, as the author suggested, more durable because the paint doesn't get dinged up and scratched during service events. The difference is that in our world of plastic airplanes, metal hinges are replaced with graphite ones to save additional weight, to decrease substantially installation work and to increase durability by replacing metal to composite bonds with composite to composite adhesive bonds that will not be subject to deterioration under vibration and stress loads. The dilemma faced with RV aircraft that use composite wingtips and cowls attached to metal fuselage and wings is that there is a greater challenge to bond these dissimilar materials and to decide where the interface is best chosen - between aluminum hinge and composite wingtip or between composite hinge and aluminum wing? In my experience I have learned that aluminum surfaces corrode into aluminum oxide, which then wears away a minute layer during vibration and stress. With metal hinges, this relentless constant process results in an increasingly sloppier fit that starts at day one. Sometimes it results in unsightly black streaks on the aircraft surface radiating from the source in the direction of the airflow during flight. Sometimes it results in broken hinge tabs over time after the attached part develops greater play when forces are applied. Carbinge graphite hinges don't exhibit these characteristics. They have nylon sleeve bearings that don't wear. They save weight and the bonding attachment is continuous all along the joint rather than point attached at measured intervals. Modern high peel strength adhesives are available that can provide very acceptable margins of safety when bonding to aluminum in applications like wing tip attachment. As long as the metal is prepped appropriately, the shear strength of the bond will be powerful enough to easily suspend the entire wing from the hinge; in fact it could support the entire aircraft. For more detail and discussion of the technique with photos and additional ideas about Carbinge Keepers to improve esthetics and ease of service use, see www.carbinge.com. There is a page on wingtip installation as well as discussion on cowl attachment. There is information on the engineering tests we used to establish load limits for the device. If you look at the photos you will note the samples were attached to aluminum tabs that the testing device actually grabbed on to. These were attached using the same high peel strength adhesives recommended for installation of Carbinge and the adhesive bonds performed flawlessly during all tests. Please note this is a shameless plug for a product. Read what you see here in that context, but realize that the writer has knowledge of many installation examples that have been successful for up to ten years over thousands of hours of flight time in aircraft that perform at speeds and in environments markedly more stressful than RV's are ever expected to achieve. Regards, John Barrett Leading Edge Composites ________________________________ Message 4 _____________________________________ Time: 09:36:20 AM PST US From: Charles Kuss Subject: Re: RV-List: Routing Elevator Trim Tab Servo Wires Garey, Drill a hole in the inboard elevator rib close to the elevator mounting weldment. Pass the wires inboard thru the rib. Attach the wiring to the round tube part of the weldment and then bring the wiring forward. Using this method, you impart a twisting type of bend along the length of the wires, rather than a pure bending. Vans has also mentioned numerous times that additional holes in the spar will weaken it. Charlie Kuss --- On Sun, 1/25/09, Garey Wittich wrote: > From: Garey Wittich > Subject: RV-List: Routing Elevator Trim Tab Servo Wires > To: rv-list@matronics.com, rv7-list@matronics.com, rv8-list@matronics.com > Date: Sunday, January 25, 2009, 1:01 AM > > > Greetings: > > Looking for a better solution than routing the Trim Tab > Servo wires thru the hole in the Elevator Spar (where the > long Servo Motor Screw goes). > > Does anybody have any pictures or diagrams of the Wire > Routing of the Trim Tab Motor wires in the Elevator to the > Horizontal STABILIZER to the fuselage. > > Not much given on this subject on Matronics. > > Thanks, Garey Santa Monica, CA > > > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV-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/rv-list Browse Digests http://www.matronics.com/digest/rv-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.