1. TENNESSEE SCIENCE OLYMPIAD 2014 Science Olympiad Coaches Workshop University of Tennessee October 12, 2013 Betsy White (bwhite6@utk.edu)  Elastic Launched Glider (Division C)

2. Terminology Roll- rotation about the long axis Yaw- rotation about the vertical axis Pitch- rotation about the axis through the wings Incidence (angle)- angle of wing above long axis Fuselage or “fuse”- main body Ailerons- hinged flaps on wings that control roll Horizontal stab(ilizer) or elevator- horizontal part of tail Vertical stab(ilizer) or rudder- vertical part of tail 2 Elastic Launched Glider 2014

3. Glider Design Must be able to withstand force of launch Lightweight and aerodynamic Different grains of balsa A-grain: soft, malleable B-grain: mid-range C-grain: harder, more stiff Blunt nose Ambroid cement or CA/superglue (easily softened with acetone) Key element: incidence (0-0) Elastic Launched Glider 2014 3 Not legal

4. Launch Elastic Launched Glider 2014 4 1. Hold the launcher in one hand and glider attached to the elastic loop in the other. 2. Stretch the elastic the desired amount, and hold the system vertically. 3. Slightly offset glider horizontally away from launch handle (less likely to hit it) 4. Tilt the system 10-20° from vertical (for easier transition into its glide) 5. Roll the glider (rotate it about long axis) about 45° for corkscrew ascent 6. Launch and pray. Stick launchers allow for wrapping to adjust band length PRACTICE! Find a grip/launch technique that works

5. Rules/Specifications Wood, foam, carbon fiber, glue, paper, plastic film, tape Non-metal ballast (i.e. clay) Must weigh more than 3.0g but less than 10 g Kits are ok, no components w/ pre-glued joints or pre-covered surfaces Wingspan not to exceed 30cm 28cm Blunt nose (chapstick cap test) Launch handle less than 1m long (excluding elastic) Elastic: non-metallic, remain in contact w/ glider during launch Labeled with team name Flight logs Eye protection at all times in the competition area 5 Elastic Launched Glider 2014

6. Flight logs Four parameters for at least 10 flights prior to competition Required data parameters for each flight: 1. Estimated/recorded peak flight height 2. Approximate length of elastic loop (relaxed) 3. Flight time Some suggested parameters are: (pick 1 or add your own) Orbit diameter Launch angle Cross section of elastic loop Height at transition to glide pattern 6 Elastic Launched Glider 2014

7. Competition Six Five minute flight period 5 official flights using 1 or 2 gliders or launch handles Must declare as “official” before launch Start time: glider leaves launch handle Stop time: any part of glider touches floor/obstruction No extra time for repair/recovery Base score: sum of two three longest flights Tie-breaker: longest non-scored flight Must be launched from launch handle by a single competitor, floor level ViolationDeduction Flight Logs are Incomplete10% deduction from each flight time Flight Logs are not turned in30% deduction from each flight time Building Violation2nd tiered (scored below all legal devices) Penalties 7 Elastic Launched Glider 2014 BONUS: State and National Level 30% bonus on time aloft if in canard configuration

8. Materials/Resources Science Olympiad Student Center http://scioly.org/wiki/index.php/Elastic_Launched_Glider Freedom Flight Models http://www.freedomflightmodels.com YouTube: Science Olympiad - Elastic Launch Glider 2 http://www.youtube.com/watch?v=Mp5YCny0r44 8 Elastic Launched Glider 2014