Answers
Raniemiec
The prop demand curve is going to be closer than the max power curve. That said, these curves are used to compare engines, since engine makers tend to all use the same ASTM/ ISO testing procedure. But know that these are mathematical "best guesses."
On a real boat, not a theoretical one, you are going to have different props than another boat powered by the same engine. Also differences in performance one might seek. For instance, is the mfr test assuming a 3-bladed wheel or a 5-bladed wheel? With how much pitch, diameter, DAR, rake, skew, etc......
What boat and engine exactly are you trying to reference. We may have data that will help you. Boat builders and designers will all tell you that actual sea trial data trumps formulaic assumption.
Click this link, and scroll through the boat tests to find a boat/engine combo similar to the one you are investigating:
http://www.boatingmag.com/find/caterpillar
Kevin Falvey
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This boat is currently under a three-year restoration in which we pulled off the deck to replace the rotted transom, floor and stringers. We also added foam flotation under the floor compliments of a tech at Regal Boats. The gelcoat was so badly deteriorated we opted to create a black and parrot green scheme using Awlgrip and Interlux Perfection paints, hand rolled on. The boat cockpit will be finished in SeaDek non-skid flooring and the cracked windshield has been restored by Taylor Made, the original manufacturer of the windshield. It's due to launch Spring 2010.
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