Hi all, just joined forum recently and thought that I'd start by asking a question in regards to my AGK exam this Thursday in regards to contradicting text between the Bob Tait and ATC books.
Firstly though I want to personally thank Bob Tait for the effort you have put into these text's. My first two exams were Air Law and Aerodynamics, and I passed them both 90% and 95% respectively, and I have your books to thank for that.
Now to my question, to keep it short, I have found in ATC that they claim that in a turobcharged system, the wstegate closes after starting for idle and taxi to compensate for the lack of exhaust gases at low power settings, then re opens for take off, then works as required for climb etc, and the reverse for landing, meaning when you shut down, the wastegate springs from closed while at idle, to open after the engine stops. In the Bob Tait text I found it stated the wastegate remains open for ground operations, and the lack of exhaust gases at low power settings while on the ground is not mentioned.
The second piece of contradicting text I found is on EGT and mixture operation. ATC states as mixture is leaned from full rich, the order is full rich, max power, peak EGT, best economy. While Bob Tait says full rich, max power, best economy, peak EGT.
Something also mentioned in the DAY VFR Syllabus which is not mentioned in the Tait text is Helix Angle, a minor thing but just thought I'd mention it while here; as I had noticed Superchargers in the DAY VFR Syllabus for Aerodynamics, but since it wasn't mentioned in Tait's text, I didn't bother studying it, and sure enough a question popped up on effect of altitude on endurance if supercharged.
Last of all speaking of the DAY VFR Syllabus, it mentions effect of height on turbo and superchargers, I am still a little vague on this area. I know Ground Boosting and Altitude Boosting and why they are used, but how does it effect performance as in fuel use, volumetric efficiency, and endurance as altitude is increased, with supercharged engines, and turbocharged (Both fixed and automatic wastegaes)
Appologise for the long post, but this covers up all my vague areas in the AGK syllabus, and thought I'd put it all in one post. After througholy going through the Bob Tait AGK book these are my only queries. Otherwise I found it very informative and well presented just like all the other books in the series