Demonstrations

Coanda Effect and Angle of Attack - Airplane Wing

Code Number :	2C20.50
Disclaimer:	Reprinted by permission of Dick Berg, University of Maryland, for use on this website. The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources. Further information regarding legal liability in use of demonstrations and labs will be found on the web site Injuries in School/College Laboratories in USA. The University of Iowa Disclaimers: University of Iowa Disclaimer All Rights Reserved..
Condition :	Good
Principle :	Bernoulli's Principle
Area of Study :	Heat & Fluids
Equipment :	Pasco cart with attached airplane wing, Plexiglas Stick with a sheet of stiff paper attached (Airplane Wing), Styrofoam airplane, Airhog Airplane.
Procedure :	Hold up the Plexiglas stick and turn it so that the paper curves in an arc. Blow air across the top with a plastic hose and watch the paper rise into the air flow. (Airplane Wing). Adjust the wing on the Pasco cart so that blowing air across it causes the cart to move to the side. The model airplanes are used to show curvature of airplane wings for real flying models. For more complete discussions and information about airfoils, angles of attack, coanda effect, and common misconceptions visit some of the websites listed in the references. The Max-Air plane is a battery powered plane. While it can be used in free flight, it is probably a wise idea to connect it to the tether in the classroom. Charge and discharge it once from the external battery pack to build up the internal NiMH batteries. After that, each second of charging should run the motor for a second. In LR1 if doing free flight, charge for no more than 5 to 6 seconds. When connected to the tether, charge for 20 seconds or less.

Web Sites

Discussion of the Physics of Airfoils:

Discussion of the Coanda Effect and Reverse Magnet:

http://jef.raskincenter.org/published/coanda_effect.html

Discussion of Common Misconceptions:

References

Harold Cohen and David Horvath, "Two Large-Scale Devices for Demonstrating a Bernoulli Effect," TPT, Vol. 41, # 1, p. 9, Jan 2003.

Clifford Swartz, "Bernoulli and Newton," TPT Vol. 41, # 4, April 2003, p. 196-197.

"Figuring Physics", TPT, Vol. 40, # 1, Jan. 2002, p. 58.

George P. (Jack) Williams, Jr., "Figuring Physics", TPT, Vol. 40, # 3, Mar. 2002, p. 132.

Chris Waltham, "Figuring Forces", TPT, Vol. 40, # 4, Apr. 2002, p. 199.

Charles N. Eastlake, "An Aerodynamicist's View of Lift, Bernoulli, and Newton," TPT, Vol. 40, # 3, p. 166, March 2002.

Chris Waltham, "Flight without Bernoulli," TPT, Vol. 36, # 8, p. 457- 462, Nov. 1998.

Bruce D. Bedford, Letters to the Editor, "The Flying Controversy," TPT, Vol. 33, # 6, p. 324, Sept. 1995.

Robert P. Bauman, "The Author Replies," TPT, Vol. 33, # 6, p. 325, Sept. 1995.

Robert. P. Bauman, Rolf Schwaneberg, "Interpretation of Bernoulli's Equation," TPT, Vol. 32, # 8, p. 478, Nov. 1994.

Martin Gardner, "Bernoulli's Principle", TPT, Vol. 31, # 5, May 1993, p. 304.

George Gerhab, Charles Eastlake, "Boundary Layer Control on Airfoils", TPT, Vol. 29, # 3, Mar. 1991, p. 150.

Klaus Weltner, "Bernoulli's Law and Aerodynamic Lifting Force", TPT, Vol. 28, # 2, Feb. 1990, p. 84.

George D. Freier, "Lift and Flow", TPT, Vol. 28, # 8, Nov. 1990, p. 518.

Klaus Weltner, "Author's Response", TPT, Vol. 28, # 8, Nov. 1990, p. 518.

Klaus Weltner, "Aerodynamic Lifting Force," TPT, Vol. 28, # 2, p. 78, February 1990.

Robert Kasting, "Airplane Dynamics: Engine Thrust, Engine Braking, and Wing Lift." TPT, Vol. 26, # 2, p. 122, February 1988.

Michael Monce, "Further Physics of Aircraft Flight", TPT, Vol. 26, # 4, Apr. 1988, p. 202.

George Gerhab, "Physics of the Stability of a Biplane", TPT, Vol. 25, # 9, Dec. 1987, p. 571.

George J. Flynn, "The Physics of Aircraft Flight," TPT, Vol. 25, # 6, p. 368, September 1987.

Albert A. Bartlett, "Bernoulli on a Large Scale", TPT, Vol. 21, # 6, Sept. 1983, p. 376.

Carl G. Bachhuber Evan Twombly, "A Magnetic Analogue of an Airfoil", TPT, Vol. 14, # 7, October 1976, p. 417.

Frank Stark, "Falls/Falls?", TPT, Vol. 11, # 5, May 1973, p. 313.

Norman F. Smith, "Bernoulli and Newton in Fluid Mechanics", TPT, Vol. 10, # 8, Nov. 1972, p. 451.

J. M. Wild, "Airplane Flight," TPT, Vol. 4, # 7, p. 295, October 1966.

David Auerbach, "On the Problem of Explaining Lift", AJP, Vol. 56, # 9, Sept. 1988, p. 853.

Klaus Weltner, Response to "On the Problem of Explaining Lift", AJP, Vol. 56, # 9, Sept. 1988, p. 853.

Jay S. Huebner and Salem Jagannathan, "Explaining Airfoil Lift in Introductory Physics", AJP, Vol. 56, # 9, Sept. 1988, p. 855.

Klaus Weltner, "A Comparison of Explanations of the Aerodynamic Lifting Force," AJP, 55, (1), January 1987.

Richard Field, "How Do Wings Work? A Few More Thoughts", Physics Education, March 2004, p. 215.

Holger Babinsky, "How Do Wings Work?", Physics Education, Vol. 38, (6), Nov. 2003, p. 497.

Ken Zetie and Holger Babinsky, 'Follow-up: How do Wings Work?", Physics Education, March 2004, p. 215.

"Back Scatter- Airplane Vortices", Physics Today, Vol. 61, # 2, Feb. 2008, p. 88.

John D. Anderson, Jr. "Ludwig Prandtl's Bounday Layer", Physics Today, Dec. 2005, p. 42.

M- 301: Richard Manliffe Sutton, Demonstration Experiments in Physics.

C. L. Stong, "Hang Gliding, or Sky Surfing, with a High-Performance, Low-Speed Wing," The Amateur Scientist, December, 1974.

4.31: Jearl Walker, "Lifting an Airplane," The Flying Circus of Physics with Answers.

"135, Lift Without Bernoulli," Christopher P. Jargodzki and Franklin Potter, Mad About Physics, p. 50,192.

"How Can a Boat Sail Into the Wind?" Reader's Digest: How in the World.

Janice VanCleave, "Ramp," 201 Awesome, Magical, Bizarre, & Incredible Experiments, p. 102.

Neil A. Downie, "23: Cable Yacht," Vacuum Bazookas, Electric Rainbow Jelly and 27 Other Saturday Science Projects, p. 190.

Mail Questions and Comments to: Dale Stille