---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Wed 01/06/16: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:50 AM - Re: Re: Aileron trim (Patrick Ladd) 2. 02:40 PM - Horizontal stabilizer seals (Richard Girard) 3. 07:59 PM - Re: Horizontal stabilizer seals (Richard Pike) ________________________________ Message 1 _____________________________________ Time: 02:50:31 AM PST US From: Patrick Ladd Subject: Re: Kolb-List: Re: Aileron trim SSBoYWQgcXVpdGUgZm9yZ290dGVuIEpvaG5zIHBhdGVudCBlbGFzdGljIHRyaW0uIEpvaG4gZGVz Y3JpYmVkIGl0IG9uIHRoZSBsaXN0IHllYXJzIGFnbyBhbmQgSSBmaXR0ZWQgaXQgc3RyYWlnaHQg YXdheS4gRm9vbHByb29mLCBtYWludGVuYW5jZSBmcmVlLCBjaGVhcCwgZWFzaWx5IGluc3BlY3Rl ZC4gV2hhdCBjb3VsZCBiZSBiZXR0ZXI/IEkgZml0dGVkIG1pbmUgdG8gbXkgWHRyYSBhZnRlciBJ IGhhZCBiYWxhbmNlZCB0aGUgd2luZ3Mgd2l0aCB0aGUgQU9BIGFkanVzdG1lbnQuIFRoZSBpbmZp 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put up something for Kolbers. A few years ago I wrote a lot about my adventures trying to get a poorly built Mk III C/X to fly like a Kolb ought to. The airplane had started life as a "C" but after a crash the cage was replaced with one for an "X" and with only 25 hours on it, it had been through 4 owners by the time it came to me. I called it the "Plane from Hell". One of the things I did when I was trying to get the elevator to trim out was make seals for the horizontal stabilizer. The seals did nothing for the pitch trim problem but it gave an impressive improvement to rudder effectiveness. Originallly, the testing was done with seals made with duct tape. When I found the improvement to the rudder I decided to make more permanent seals from fiberglass. The rudder improvement I found was that the seals made it possible to pick up a dropping wing during stall with rudder alone, just like I was taught in the C172. Without the seals, neither my IIIC nor the IIIC/X would do that. I should add that by the time I reached this point I had reset the wing angle of incidence to the current recommendations so the airplane was a full "X" by that time. Anyway, with the seals in place I could hold the stick back against frame tube and pick up a wing with the rudder. In my "C" I tested it at up to 1100 lb. gross weight. With the "X" I held it at stall at a weight of 1280 lb. In both airplanes I held it for at least 1000 feet of altitude loss and it was no problem at all to keep the wings level. I didn't make any photos of the duct tape seals but I did of the seals made from fiberglass. I made them right on the aircraft using duct tape as a release agent, a standard Burt Rutan method. On the "X", since the horizontal stabilizer is straight down the boom tube, I made two seals for each side then bonded them together. If I had it to do again, I'd tape off the underside, too, shoot some house sealing foam into the gap then sand the top to shape so I could get a better form around the forward stab mounting hinge. Another thought I've had is that I could probably have made good seals that would have allowed easy folding with foam tape like that used for sealing a camper shell to a pick up bed. So, it's winter and a good time to do projects and making horizontal stabilizer seals is a good one to make your Mk III a better, safer aircraft .. Rick Girard -- =9CBlessed are the cracked, for they shall let in the light.=9D Groucho Marx ________________________________ Message 3 _____________________________________ Time: 07:59:56 PM PST US Subject: Kolb-List: Re: Horizontal stabilizer seals From: "Richard Pike" Good topic. I noticed a substantial difference in elevator effectiveness when I gap sealed the elevator on my MKIIIC to the horizontal stab (Not likely that I could gap seal it to the vertical stab...) and also added vortex generators to the underside of the horizontal stab at the 10% cord line of the stab and elevator combined cord line. Please post pictures of your results, and be sure to not resize them; we got to keep Herb happy and lazy! -------- Richard Pike Kolb MKIII N420P (420ldPoops) Kingsport, TN 3TN0 Would you consider yourself to be a good person? https://www.youtube.com/watch?v=VWcDXT6pH7A Read this topic online here: http://forums.matronics.com/viewtopic.php?p=451794#451794 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kolb-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Kolb-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/kolb-list Browse Digests http://www.matronics.com/digest/kolb-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.