To: Grey Area
The original issue of the Blue bible was some time in the late 1940s. When I went to work for Sikorsky in 1955 I was issued an updated version. Nothing was revised but a lot of information was added. The copy I have was published in 1964 and I am sure that it has been updated since that time. John R. Montgomery and aerodynamicist at Sikorsky originally wrote it. I don’t believe he is still alive but the 1964 edition still carries his name as the author. In any case I requested the copy I have from the service school at Sikorsky two years ago so it is still being used to teach helicopter aerodynamics.
[ 29 November 2001: Message edited by: Lu Zuckerman ]