Experimenter

December 2013

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.

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Hangar Debrief the aircraft continues the loop to the inverted position, we are still reading 4g on the g meter but our radial g (centripetal force) is now 5g. Thus we have a 2g (radial) reversal from the bottom of the loop to the top of the loop while maintaining a 4g load factor. Figure 3 So in the real world when Ole Hotshot pulled up and started his roll, it was like being on the bottom of the loop. He has to overcome the constant 1g gravitational pull, but when he becomes inverted, Mother Earth is now helping. Additionally he probably lost airspeed as he increased the g load; and this subsequently increased the aircraft pitch rate, so his turning radius was decreased. Now the aircraft was inverted, so the summation of g reversal, decreasing airspeed, and increasing pitch rate caused the aircraft nose to rapidly point to Mother Earth and reach a point from which aerodynamic recovery was impossible. Aerobatic pilots and fighter pilots are well versed in this law of physics, but all too many GA pilots are not, and when they venture into the occasional aerobatic maneuver, even something as basic as Ole Hotshot's roll, they are in danger of inflicting damage to themselves as well as the aircraft. Keith Phillips is a member of the EAA Homebuilt Aircraft Council. He regularly flies his SX-300 from the Spruce Creek Air Park. EAA Webinars What would you like to learn? SportAir Workshops Get Hands-on. Get the skills you need from the experts you trust. Dates EAA SportAir Workshops Offered Location January 18-19........... RV Assembly ..............................................................Frederick, MD January 18-19........... Sheet Metal & Gas Welding .......................................Lakeland, FL Interactive. Educational. Mobile. EAA offers a series of free live webinars moderated and presented by aviation experts on a variety of topics. Register today! EAA.org/webinars January 25-26 .......... Composite Construction, Fabric Covering,............... Oshkosh, WI Sheet Metal, Electrical Systems, Fundamentals of Aircraft Construction, Gas Welding, & What's Involved in Kit Building February 8-9 ............. Composite Construction, Fabric Covering,.........Chesapeake, VA Sheet Metal, Electrical Systems, Gas Welding, & What's Involved in Kit Building February 22-23......... Gas Welding ..................................................................Lakeland, FL March 22-23 ............. Composite Construction, Fabric Covering,.........Watsonville, CA Sheet Metal, Electrical Systems, & What's Involved in Kit Building Visit SportAir.org to register today or call 1-800-967-5746 for details. EAA Webinars are supported by 40 Vol.2 N o.12 / December 2013 EAA SportAir Workshops are sponsored by

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