Shoebox Design Challenge No Extras
- 1. Fly the Dream!Fly the Dream!
- 2. The Four Forces of Flight
- 3. Review - Gliders • Have No Powered Thrust • Typically have a LONG wing span • Usually very LIGHT • Built to Reduce Drag
- 4. What can we Control on our Gliders? • Mass • Placement of wings for MAXIUM LIFT • Angle of Wing • Aerodynamic to REDUCE Drag
- 5. How Do We Control Lift? • Bernoulli's Principle • Angle of Wing http://www.grc.nasa.gov/WWW/K-12/airplane/foil2.html
- 6. Bernoulli's Principle • Bernoulli's Principle states - as the velocity (speed) of a fluid (air) increases, the pressure exerted by that fluid (air) decreases. Airplanes get a part of their lift by taking advantage of Bernoulli's principle. Race cars employ Bernoulli's principle to keep their rear wheels on the ground while traveling at high speeds. • If wings were flat – Air would travel from front of the wing - back of the wing covering the same distance over the same time • However - Wings are Curved on top – So the air takes longer to travel over the top of wing to catch up with the air moving under the wing • Faster air on Top / Slower air on Bottom
- 7. Bernoulli's Principle • Bernoulli's Principle – Air on top is moving so FAST it can NOT add pressure (LESS / LOW AIR Pressure) – Air on bottom is moving SLOWER so it adds pressure (MORE / HIGH Pressure) • Lower Pressure on TOP and High Pressure on BOTTOM creates LIFT
- 8. Bernoulli's Principle • Activities – Funnel and Ball – Umbrella Bag
- 9. How Do We Control Lift? • Bernoulli's Principle • Angle of Wing http://www.grc.nasa.gov/WWW/K-12/airplane/foil2.html
- 10. Angle of Wing
- 11. How do we Control Drag? • Which is more aerodynamic? – A Hummer or a NASC Car
- 12. How do we Control Drag? • How about between Tony Stewart and Dale Earnhardt Jr. • NASA wants to know the subtle differences
- 13. Testing Drag • NASA can use either a Wind Tunnel or Fluid Dynamic Lab to understand the aerodynamics of a plane – Wind tunnels use wind to match “real time” velocity and speed – Fluid Dynamic Labs use water moving at a slow speeds
- 15. Shoe Box has to remain INTACT Four (4) Sides and bottom Can slit sides of box to insert wings NO PROPELLERS – Nothing to add power or thrust Can use any kind of material you want (duck tape, news paper, yard sticks, etc) And of Course – A Shoe Box
- 16. - Glide Slope Ratio Distance / Height Thrown - Aspect Ratio Length of wing / Width of wing - Higher the number the better the design