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6 Local Lift Coefficient over Span ( Circular Planar Wing Fig. E. E. lii! - ' ' .. 924 00 *70 0 0e [2 "OSr 2O 00'0383 001 =] 0 -to 00 g No. 10. l at 90o angle of attack. -- 5* 0 5 -- e xp good agreement with experiment near the tip of wing unlike near the center of wing. )hows usin geneintrasl equtioprsnt ment experimentro even near the tip of h distri-uino rsure igN. metwit~h resotie angle of ofattackishonnFg. wing. The same50 tendency the lift denis obtained for the other wings. 11. 2. Agreement between theory and euperiment is not good nearusi t eip.

Ods, the li:fting surface theory was discussed from the view point of application to marine propellers. The conclusions are as follows. (1) Results of numerical calculations by the three methods for the same hydrodynamic model show good agreement with each other except snme regions. The agreement between numerical result and exoeriment is satisfactory. s the rzsuits the evaluation of the theory becomes clear. (2) The advantage and disadvantage of the three methods become clear by the investigation into the numerical results by the methods.

4k j=! 5) can be perforred analyticalto ly, which is the principal advantage of Metro 2. 5) in the ma;in body has a singular behavior for s-0 as w1 +w2 ivle h itn ufc tion. 5 )is transformed with sepathe singularity shown above. 5) is easy because singularities are not included in the integrands. 8) . rpolatj:,. formula, and singular integration is performed analxcically[15]. Y. Koyama has presented us with a very interesting and enlightening paper. Within the limits imposed by the choice of the Y methods there is very little to add to the statements in the paper except that:(1) The use of Tikhonov's regularisation method 1),2) might have avoided the problems arising from the logarithmic singularity near the edge or the tip of the blade, (2) It might be beneficial to use Lighthill's leading edge correction 3) or its extended version to resolve the singulai behaviour at the leading edge which, after inspecting the computed results, might also improve the results of the Method 3.

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