April 2014

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/287214

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Page 25 of 38

26 Vol.3 No.4 / April 2014 HINTS FOR HOMEBUILDERS Deburring Aluminum Sebastian Heintz and Roger Dubbert from Zenith Aircraft demonstrate how to deburr aluminum. Using various tools, they remove sharp edges to prevent stress risers and cracks from developing. Determining V so Speed EAA Flight Advisor and Technical Counselor Joe Norris discusses V so speed. This speed is required to be determined for experimental amateur-built aircraft during the Phase 1 fl ight testing process. Blind Pulled Rivets Sebastian Heintz and Roger Dubbert from Zenith Aircraft demonstrate how the fl at headed, countersunk blind rivets used in the construction of Zenith aircraft are pulled and shaped into a low profi le dome head rivet. Layout Templates Mark Forss, manager of EAA's SportAir Workshops, demonstrates a way to transfer layout holes using a see-through plastic template. This process allows matched-hole layout of wing skins or other large parts. HINTS FOR HOMEBUILDERS VIDEOS HERE ARE SOME OF THE MOST RECENTLY ADDED VIDEOS FOR HOMEBUILDERS: SPRAY TUBES ARE a great addition to many aerosol-packaged lubricants, solvents, air, and even paint removers. They permit the application of the material right at the place necessary without getting the product all over the place. Tubes yield great control. But the spray tube is not always a right length. You can cut it off if it is too long, but what do you do if it's too short? The electronics store has the answer—heat shrink tubing. It comes in 4-foot lengths in many different colors so one can cut it to length; I use color coding for different materials. Most nozzles are a universal size. To lengthen the existing tube, add some heat-shrink tub- ing around it. You can shrink another tube at the exit. If the spray tubes are placed end to end without a gap, the result is very rigid. If you have nothing but shrink tubing between the two ends, it is very flexible. In the photo, there is a large gap between the two tubes. Safety wire has been used to provide some rigidity, plus it allows you to bend the assembly to curve it around an obstacle. If you want a long, straight assembly, tape a dowel alongside. I save the tubes and nozzles from spent cans, but be- ware that some of the tubes may have a slightly different diameter. It doesn't make any difference when building an extension, but they might not fit into the nozzle. If one nozzle is too large, try another. If it's too small, you can see how the safety wire in the inset is wrapped around the nozzle onto the tube, holding the two together. Another solution is to superglue the tube in place. I did that when a tube was needed on a can of starting fluid and the pressure of the fluid kept "blowing " the tube out of the nozzle. Spray Tube Extensions BY CY GALLE Y E A A E X P _ A p r 1 4 . i n d d 2 6 EAAEXP_Apr14.indd 26 3 / 3 1 / 1 4 9 : 4 4 A M 3/31/14 9:44 AM

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