also the best type of V-Stack is a WIDE Domed like this:
With this type of stack the air flow coming from the sides or underneath the lip are pulled straight over the lip instead of swirling then entering in.
Youtube example:
GOOD STACK:
BAD STACK:
Notice the design of the lip.
Estimated power gain with a V-Stack is 2% to 4%. Could be better or worse. Im not a scientist or engineer but from what I have read 2% to 4% power gain is the norm.

With this type of stack the air flow coming from the sides or underneath the lip are pulled straight over the lip instead of swirling then entering in.
Youtube example:
GOOD STACK:
Notice the design of the lip.
Estimated power gain with a V-Stack is 2% to 4%. Could be better or worse. Im not a scientist or engineer but from what I have read 2% to 4% power gain is the norm.