Latest news June 13, 2006 OSTIV Lectures - day four After a “rest day”, we began the fourth day of the OSTIV Congress with Tony Segal’s presentation “ASK-13 Glider Impact Test – Nosewheel or Skid”. Tony described the results of dropping an ASK-13 equipped with a nose skid compared with those of the same glider having the skid replaced with a nose wheel. It was concluded that a wheel reduces the loads on the pilot’s spine to the extent that serious spine injuries can be avoided.
For the second presentation of the day, Gerhard Waibel presented the paper “A Few Words on Airbrakes” from it’s absent author, Jozsef Gedeon. Various airbrake concepts were reviewed, and the advantages and disadvantages of each concept were considered. The historically interesting and unusual concepts of shutter-type airbrakes, as well as bat-type airbrakes were also described. Ultimately the Schempp-Histh type airbrake was recommended as a good overall compromise.
The paper “ASK-21: Spin Training with Tail Weight” by Jannes Neumann was then presented. This paper dealt with the importance during flight training of demonstrating to the student the longitudinal stability characteristics of the sailplane as they are affected by center-of-mass location. In addition, using tail weight during spin training, so that the glider will behave with the instructor as it will with the solo student, was emphasized. It should go without saying that flight instructors need to be trained in these procedures.
Herbert Pirker then presented his paper “6 Features Revealing Pre-declaring to be a Betting and NOT a Sporting Performance”. This paper dealt with the issue of whether pre-declaring should or should not be a requirement for certain sporting flights. It was argued that the need for pre-declaring Barron Hilton Cup and De-Centralized Competition flights should not required.
