JAN 2015

Experimenter is a magazine created by EAA for people who build airplanes. We will report on amateur-built aircraft as well as ultralights and other light aircraft.

Issue link: https://experimenter.epubxp.com/i/449720

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Page 25 of 32

26 Vol.4 No.1 / Januar y 2015 HINTS FOR HOMEBUILDERS Knife Trimming Composites EAA Technical Counselor Mike Busch demonstrates how to trim a layup while in the green state not fully cured. Removal of Stainless Steel Pulled Rivet Brian Carpenter from Rainbow Aviation Services demonstrates a technique to remove a stainless steel pulled rivet. Drilling Holes in Composites EAA Technical Counselor Mike Busch demonstrates the use of a hole saw to cut accurate holes in cured composite materials. Locating Blind Holes EAA Technical Counselor Mike Busch provides a tip to help locate holes without the use of a hole-fi nder tool. HINTS FOR HOMEBUILDERS VIDEOS HERE'S SOME OF THE MORE RECENT VIDEOS ADDED TO EAA'S CADRE OF MORE THAN 400 HOMEBUILDER HINTS VIDEOS: MY NEXT DOOR NEIGHBOR and I were talking one day about our J-3 Cubs and their construction. My Cub was built in Lock Haven, Pennsylvania, and his was built in Ponca City, Oklahoma. He has owned several Cubs and is knowledge- able about them and other Short-Wing Pipers. He mentioned that some steel-tube fuselage structures were treated internally with smoke rather than oil for cor- rosion control. So I scratched my head and asked more questions. He explained that you could drill a small hole in a section of tubing and add a small amount of boiled linseed oil. Then heat it with your torch and that would fill the entire tube up with smoke. When the smoke cools down, it will leave a film of oil on the inside walls of the tubing. That sounded a whole lot better to me than spending hours sloshing oil around in the tubing and trying to recover it. So I went home and drilled a 1/8-inch hole at each end of a section of tubing. I then heated the tubing underneath one of the holes and added a few drops of oil. I angled my torch so it would push the smoke down the tube and a few seconds later and … voila! Smoke started puf ng out the hole on the other end like a toy train. I quickly closed the holes with a rosette weld and moved to another section. This might be old school to some, but I hadn't heard of it before. Seemed to work on. Build on! Smoke those Tubes! An alternative to oil BY KE VIN CONNER, REPRINTED FROM THE HAT Z NEWSLE T TER

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