Posted for "Chatfield S. Daniel" <CDaniel@FNBSouth.com>:

 George,
 
 Isn't the "improve the critical altitude" concept also true for normally
 aspirated engines?  Say if you normally cruise at 75% power... and you
 are at 5000 ft at 24X24 and you pull the ram air...your MAP goes up 1.5
 inches...in order to get back to 75% you pull the MAP back 1.5 inches to
 24???  So the advantage is above 8000 ft.  Right?
 
 Chat Daniel
 N678RV
 N891AC (reserved)