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The Cialitron by LevTech

The Cialitron by LevTech. OPERATION. 30 minutes continuous use by single operator Maximum operator payload of 200lbs Steering column mounted thrust throttle Operator adjusted lift power Standing position Dual rudder steering. SAFETY. Lift power adjusted prior to mounting

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The Cialitron by LevTech

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  1. The Cialitron by LevTech

  2. OPERATION • 30 minutes continuous use by single operator • Maximum operator payload of 200lbs • Steering column mounted thrust throttle • Operator adjusted lift power • Standing position • Dual rudder steering

  3. SAFETY • Lift power adjusted prior to mounting • All motors started and checked prior to mounting • Pre-operation inspection of steering and skirt integrity • Protective gear to be worn • Fan-blade housing • Initial trials conducted with supervision and balance assistance

  4. LIFT FAN ANALYSIS • Air flow vs. rpm curves for various fan manufacturers require a 12 inch fan, 6 and 8 blades, and fixed pitch of 10-15 degrees • A fan of this size needs to rotate at approximately 3600 rpm

  5. LIFT ENGINE • Air pressure and lift calculations with a fan efficiency of 70% and a motor efficiency of 85% require a 2.5HP motor • The lawn mower engine is oversized by approximately 0.3HP to compensate for pressure losses in the skirt, fan, and platform assembly

  6. THRUST ANALYSISFORCES ON HOVERCRAFT • Reynold’s #: • Air Drag: • Exposed surface, plate approximation: 1.1mX1.6m • μkassumed to be ~ 0.04

  7. THE GOVERNING EQUATION • Newton’s 2nd Law: • After solving differential eq. and taking t to gives max velocity • Select a fan that satisfies the constraints

  8. SELECTION OF FAN AND MOTOR • 30’ diam. 2 blades, 6 hp, 1725 max rpm, 9500 max cfm, 13 degree pitch • Eq. yields 6 max mph • The important properties that affect hover speed: weight, kinetic friction, and fan volumetric flow rate and diameter

  9. SELECTION OF THRUST ENGINE • Gas engine with at least 4.5 hp • Engine inefficiency: need 5.5-6 hp • 6.4 hp, ¾’’ diameter shaft, 4 stroke, electric start, on/off start, choke, and throttle • 16.9 L x 13 W x 13.8 H, 55 lbs

  10. PLATFORM DIMENSIONS • Dimensions for the plywood platform are 2.5’ x 6.25’ • 6” extended outrigger system maintains the necessary space for all equipment and the rider • Balance was a contributing factor in the sizing of the platform

  11. BOARD DIMENSIONS

  12. STRESS ANALYSIS • Max Moment = PL/4 • Max Stress MY/I = 535 PSI • Yield Stress of wood = 4,350 PSI • Safety Factor ~ 8

  13. TOTAL WEIGHT

  14. CONTROLS • Rudders swing side to side by moving handlebars • Rudders attached with door hinges and supported by rod • Throttle cables for lift and thrust engine attached to handlebars

  15. SKIRT DESIGN • Pliable and Durable • Material: Reinforced nylon from a whitewater raft • Attached to outrigger and base to form semi-circle ring • Reinforced holes

  16. BUDGET *We currently have a useable engine for lift, but, since it cannot be left on the Cialitron after the final demonstration, we are looking for a permanent engine

  17. WAIVER AND RELEASE Since our project has a notable risk of injury to the person and property of the rider, we thought it best to draft a waiver releasing Columbia University from liability for any/all injury sustained while riding the Cialitron. All members of LevTech have signed this waiver. Any person wishing to ride the Cialitron must sign a waiver.

  18. Where do we go from here? Next Steps: • starting fabrication of the parts for which we currently have materials (including the lift engine) • ordering parts from McMaster et al. • continuing our aggressive search for engines that fit within our budget • increasing the intensity of our donation campaign

  19. REFERENCES • Baker, Russell, et al. “Solar Splash 2002 Columbia University Technical Report Boat #13.” Columbia University, 1 May 2002. • Beaty, William J. “Ultra Simple Hovercraft.” Science Hobbyist. 1997 <http://www.amasci.com/amateur/hovercft.html>. 27 Jan 2005. • “A Comparison of Different Hovercraft Lift, Thrust and Transmission Systems.” Airlift Hovercraft.<http://www.airlifthovercraft.com/HC%20Lift%20&%20Thrust%20Systems.htm>. 29 Jan 2005. • “Episode 17: Elevator of Death, Levitation Machine.” Mythbusters. 6 Oct 2004. The Discovery Channel, 29 Jan 2005. • “Hovercraft Theory.” Ben’s Hovercraft. 24 Sept 2003 <http://www.rchovercraft.com/theory.html>. 27 Jan 2005. • Kurtus, Ron. “Determining the Coefficient of Friction”. School for Champions. 15 Dec 2002. 8 Feb 2005. <http://www.school-for-champions.com/science/frictioncoeff.htm>. • McMaster-Carr Supply Company. 2005. 8 Feb 2005. <http://www.mcmaster.com/>. • P. Ponk Aviation. “Propeller Tip Speed Calculator.” Hoverhawk. 10 Feb 2005. <http://www.hoverhawk.com/propspd.html>. • Vawter, Richard. “Drag Force in a Medium.” Western Washington University. Dec 2005. 10 Feb 2005. <http://www.ac.wwu.edu/~vawter/PhysicsNet/Topics/Dynamics/Forces/-DragForce.html>. • White, Frank M. Fluid Mechanics. Fifth Edition. New York: McGraw-Hill, 2002.

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