Telltales on sails were a Gentry invention and they were long known as Gentry tufts. He's also known for disproving the 'slot effect' theory. The more complex t

Telltales on sails were a Gentry invention and they were long known as Gentry tufts. He's also known for disproving the 'slot effect' theory. The more complex theory is the Kutta condition covered in the article. He went to Cal (class of 55), as did Lowell North, Paul Bieker and Tom Blackaller.