Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 22, No. 1 (February 2009) 59-68   

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  COMPARISON FINAL VELOCITY FOR LAND YACHT WITH A RIGID WING AND CLOTH SAIL
 
 
M. Khayyat* and M. Rad

Department of Mechanical Engineering, Sharif University of Technology
P.O. Box 11165-9567, Tehran, Iran
khayyat@mech.sharif.edu – rad@sharif.edu

* Corresponding Author
 
 
( Received: April 07, 2008 – Accepted in Revised Form: September 25, 2008 )
 
 

Abstract    The powering requirement of a land yacht is one of the most important aspects of its design. In this respect the wind tunnel testing is an effective design tool. In fact, changing the parameters of the vehicle and testing the changes in the wind tunnel will give us a better understanding of the most efficient vehicle, and yet it is time consuming, expensive, and has inherent scaling errors. Another set of design tools are Computational Fluid Dynamics and parametric prediction. Computational Fluid Dynamics (CFD) codes are not yet wholly proven in its accuracy. Parametric prediction is the starting point for most engineering studies. It will be used to calculate the land yacht’s performance and provide a steady-state trim solution for the dynamic simulation. This tool is absolutely self validating. In present work, parametric prediction tool has been used for velocity prediction of a radio control land yacht with a rigid airfoil and cloth sail. The lift and drag coefficient of the rigid wing and cloth sail are obtained from the wind tunnel. The results show that the maximum velocity of the land yacht model with rigid wing is higher than cloth sail which occurs at 100 to 130 degree angle, courses.

 

Keywords    Land yacht, Sail Craft, Velocity Prediction Program, Aerodynamic

 

References   

1. Khayyat, M. and Rad, M., “Land Yacht Aerodynamic Performance”, Proceedings of the 13th AnnualInternational Conference on Mechanical Engineering, ISME 2005, Isfahan, Iran, (17-19 May, 2005).

2. Larsson, L.and Eliasson, R. E., “Principles of Yacht Design”, 2nd Ed., International Marine, Camden, ME, U.S.A., (2000).

3. Martin, D., “PCSAIL, A Velocity Prediction Program for a Home Computer”, 15th Chesapeake Sailing Yacht Symposium, Annapolis, Maryland, U.S.A., (2001), 99-116.

4. Marchaj, C. A., “Aero-hydrodynamics of Sailing”, Camden, ME: International Marine, (1988).

5. Smith, M. J., Komerath, N., Ames, R., Wong, O. and Pearson, J., “Performance Analysis of a wing With Multiple Winglets”, Applied Aerodynamics Conference, 19th, AIAA, Anaheim, CA, U.S.A., No. 2407, (June 11-14, 2001).

6. Khayyat, M. and Rad, M., “Some Experimental Studies on Performance of a Rigid wing Land Yacht Model in Comparison with VPP”, International Journal of Science and Technology, (http://www.scientiairanica.ir/), (2008).

7. Davidson, K. S. M, “Some Experimental Studies of the Sailing Yacht”, Transactions of the Society of Naval Architects and Marine Engineers, Vol. 44, (1936), 441-453.

8. Birchill, J., “The Windform Sail”, The Ancient Interface II, Proceedings of the Second AIAA Symposium on the Aer/Hydronautics of Sailing, AIAA Lecture Series, AIAA Los Angeles, Vol. 9, (1970), 59-73.





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