Your Mainsail and the Wind 



100" Course 



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Photo by r..\i. k 



The boom makes an angle with the boat to secure the highest possible speed 



l\N interesting and practical series of 

 AA experiments in a field that is new 

 to science has been made at the 

 Massachusetts Institute of Technology 

 by Professor H. A. Kverett, for the 

 purpose of determining some of the 

 facts about the propelling power of 

 sails. By dint of experience and by 

 rule of thumb certain practices are 

 common in sailing boats. Skippers 

 agree in the main about these practices, 



but there are individual variations from 

 any rule. Each man maintains and 

 asserts that his is the proper way. 

 What Professor Everett has done is 

 to determine scientifically certain ele- 

 ments common to all sails witii regard 

 to thrust or propelling power, and 

 twist, and to estai)lish certain funda- 

 mental principles which fix the relations 

 of sails to direction of the wind. 



In Boston Professor Everett was 



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