Experimenter

September 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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E A A A ir Ve n t ur e O s h ko s h 2 013 S-6S, which will remain in production. The S-20 has a lot to offer high-wing enthusiasts. According to Randy Schlitter, RANS president, the side-by-side S-20 Raven can equal or exceed the performance of the S-6S. The S-20 Raven uses the S-7 wing and tail but has a new, all-welded steel fuselage. The new aluminum 7075 landing gear is CNC machined, heat treated, and shot peened for long life. The S-20 also can be switched from a tailwheel to a tricycle gear. Sliding, adjustable, and quickly removable seats together with large, wide-opening doors allow easy ingress and egress. The seat backrests recline for easy baggage compartment access, and the removable seats offer the uncommon possibility to sleep in the aircraft, if needed. The Raven wings are the same as on the S-7S, featuring one-piece, fully CNC-machined stamped ribs, CNCmachined spars, aero servo ailerons, and 26-gallon fuel tanks. RANS said the aircraft is still in development, but it is accepting pre-orders; four aircraft were sold during AirVenture. www.RANS.com The AvMap Ultra EFIS is designed for light-sport, ultralight, and experimental aircraft. It contains solid-state gyros, accelerometers, magnetic field sensors, air data sensors, and a UAV navigation motion processor. The Ultra EFIS 3.5-inch PFD screen displays attitude (roll, pitch, and heading), airspeed and altitude (pitot-static system based), wind sideslip, and vertical speed. AvMap now gives the pilot the possibility to choose the EFIS solution: standalone or integrated with EKP V. Depending on space availability, either two displays or one unique device can be chosen. The Ultra EFIS is the standalone solution for panel mounting; owners of EKP V may consider buying the A2 ADAHRS module to be used together with the cockpit docking station to complete the AvMap EFIS set. The Ultra EFIS will be on sale starting this fall at $1,200, while the complete AvMap EFIS set (EKP V plus Cockpit Docking Station and A2 ADAHRS) retails in the United States at $2,750. www.AvMap.us/avionics/instruments/UltraEFIS Beringer Introduces 'No Ground Loop' Tail Wheel AvMap Announces the Ultra EFIS AvMap, the Italian manufacturer of GPS equipment since 1994, presented the Ultra EFIS, a standalone unit providing air data, attitude, heading, and altitude reference (ADAHR) during AirVenture 2013. The AvMap Ultra EFIS is a standalone device with a 3.5inch, ultrabright, sunlight-readable LCD display. The unit is compact, 49.5 millimeters deep, and ultralight—only 145 grams. The AvMap Ultra EFIS can be easily installed in a panel fitting a standard 84-millimeter (3.3-inch) panel hole and connected to the GPS receiver and the aircraft's pitot-static system to provide reliable ADAHRS data. 26 Vol.2 No.9 / Sep tember 2013 The well-known French wheel and brake manufacturer Beringer introduced a new, patented, tail wheel assembly featuring a double pivot that does not allow a tail wheel aircraft to ground loop. Beringer technicians noted that taildragger aircraft instability increases with the square of speed. Thus, at certain speeds, even a skilled pilot is not able to master the conventional tail wheel. Fast airplanes (such as the P-51 Mustang) have a locking system that maintains the tail wheel in line with the aircraft longitudinal axis. This solves the instability problem but does not allow almost any path correction required in crosswind conditions or to counter the engine torque. According to Beringer, it has found the solution, developing a tail wheel with a double pivot mechanism. Pivot 1 (the "rear" one, in line with the wheel axis) allows precise guidance of

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