Milgram 



MAST 



SAIL 1 ARC 

 MAX CAMBER 50% BACK CAMBER = I90FT CHORD=l 55FT. 



Alphaj»0,0 degrees 



CLj=1.5 



LUFF 



LEECH 



SAIL 2 fwd DRAFT FORWARD 

 MAX CAMBER 35% BACK CAMBER= OI90FT CHORD=l.55FT 



Alpha|«2.3 degrees CL|»1.237 



LUFF 



LEECH 



SAIL 2 bwd DRAFT AFT 



MAX CAMBER 65% BACK CAMBER =190 FT CHORD=l.55FT 



Alphaj=-2.3 degrees CL, =1.237 



Alphaj=0.0 degrees CLj=l.Ull 



SAIL 3 "V" 

 MAX CAMBER 50% BACK CAMBER=0 24FT CHORD M.55FT 



Fig. 10 - Two-dimensional sections 

 tested by Herreshoff 



CONCLUSIONS 



Because sails operate at unusually high lift coefficients and in the presence 

 of a lower boundary and a spatially varying incident wind, there are some im- 

 portant differences between the aerodynamics of sails and those of most other 



1422 



