Hi Dick,
My post was not intended to imply suspicion I promise. Merely to try and garner opinion on to what practical use this information can be put. Combined with your own excellent document the SN does explain the effect of carb heat on engine power and MAP indications.
What does not appear to be stated however is what you can do with this knowledge in the cockpit. We are obliged to fly within the published (POH) limits which do not currently reflect any allowance for using carb' heat. Happy to be corrected here.
Therefore the debate I'm inviting is "How do we put this knowledge to use?".
The document says that for a given BHP output the application of full carb' heat will increase the MAP reading by 1.5" (providing of course you don't reach full throttle first). What it doesn't say is that it's therefore legal to use an amended MAP limit when flying with full carb' heat.
Maybe that's not the intent of the SN and I'm missing the point but the questions are already being asked, see LOZZ's post above.
Perhaps amendments to the POH are in the pipeline?
Disclaimer: It doesn't seem to matter what you type it always seems to come over as confrontational on here! Really not the case here. I welcome the published information, I'm just interested in opinions on how we put it to use.