Hello Curtis!
The two main ways that I teach the straight blast are the centerline rotation method, which comes from Wing Chun Gung Fu, and what we call the power blast, which involves more body motion and punching more from the shoulders than from the centerline. I prefer the centerline rotation method because it is the most economical and offers more protection during delivery. The power blast is normally used after the opponent has been stunned or suffers irreparable damage. In other words, he's going down anyway, so let's just help him go down faster with even more injuries!

The other methods are just variations of these two.
Keep Blasting!
Sifu Lamar M. Davis II
Senior Instructor
Hardcore Jeet Kune Do
Sifu@HardcoreJKD.com
http://www.HardcoreJKD.com
Kwoon (205) 274-9011
"Hit Hard, Hit Fast, Hit First - ALWAYS!"
"What is Jeet Kune Do (JKD)? Chinese martial art, definitely! It is a kind of Chinese martial art that does away with the distinction of branches, an art that rejects formality, an art that is liberated from tradition." __Bruce Lee