Well in this case CHAD stands for CHeap And Dirty staging. It means taking a normally single stage rocket and taping an additional motor directly to it. You need to have a very stable rocket because you are adding another mass with the motor on the aft of the rocket.You should also watch out for the falling motor during staging. In most cases, if the stability is there, you can get quite a boost. Have any of you tried CHAD staging?What are your experiences?
Here is a great tutorial on all types of staging.
Great article by Dick Stafford on Rack Rockets and Mega-staging