 E.A.A. CHAPTER 1230 NUT TREE |
HOMEBUILDER'S
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| PROJECTS BY AIRCRAFT RV SERIES GLASS STAR RANS AIRCRAFT ZODIAC SONEX Aercoupe PROJECTS BY BUILDERS MEMBER'S AIRCRAFT PAGES TECHNIQUE SECTION HOMEBUILDER'S LINKS NEW NEW
NEW NEW NEW
RV7 Empennage kit 10/2008
*RV6/6A Tail and Wing Kits*
For Sale 3/8/2008
AHRS Mount Kit for RV-7/9
Part Number = IF AHRS MOUNT Price = $30.00 Thirty Dollars from Vans. Any reasonable offer will be accepted.
Jon Hussey
Vacaville CA
707-451-2565
Technical Links
Aeroelctric- Bob Nuckells
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NEW WANT ADS/BUY &
SELL LISTINGS BELOW This Month' s featured technique session is by Jerry Pryce. His lecture was given at our November meeting. Next month we could feature your ideas right here. CONTRIBUTE!! FORMING PLEXIGLASS Plexiglass can be bent cold. You can even force it into a curved frame, for example, but the minimum radius of the bend or curvature must be at least 180 times the thickness of the acrylic sheet. You can bend a 1/16-inch thick sheet into a 22-inch circle. The minimum bending or curving radius, then, for 1/16-inch sheet is 11 inches, and for 1/8-inch plexiglass, 22 inches. If the desired curvature for your piece is NOT circular or somewhat sharper than the minimum bend radius mentioned, you would have to resort to heat forminG. An acrylic sheet is a thermoplastic material; it can (when heated to approximately 340 degrees F) be stretched, shaped or formed into almost any shape you want. As it cools, it will harden again, retaining its formed shape. DRAPE-FORMING OF PLEXIGLASS For small windshields and sharply curved landing light covers, etc., the kitchen oven may be used provided that you can arrange for diplomatic immunity from your wife or significant other. Most standard kitchen ovens can accommodate plastic pieces up to 18 inches long. A typical exercise in drape-forming a landing light cover is illustrated in the accompanying Figure 2. BASIC HEAT FORMING Remove the masking paper before any heat forming operation. When you put the plexiglass in the oven, never lay it on a bare metal tray, rack, or form, as that will result in "mark-off" areas. Your wood or plaster forms should be prepared by covering them with cotton flannel cloth. Avoid excessive or prolonged heating of the plexiglass. For simple forming operations, preheat the oven to about 250 degrees F and slip your mold and all into the oven. Heat it for 5 minutes or until the plexiglass droops and limply embraces the form. Remove the form and plexiglass from the oven, and using cotton gloves, make sure that the plexiglass stays snugged down around the form as the acrylic piece cools. Do not remove the plexiglass from the form until it has cooled below 175 degrees F. All acrylic sheets will shrink approximately 2% when heated, therefore if there is a requirement for a dimensionally accurate piece, it might be best to make the piece slightly oversize, and later trim it to the exact dimensions
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