Surface piercing propeller characteristics

[manunk]

Dear all,
Now, I am evaluating a Boat (displ. 16,3 T) propelled with Surface piercing propeller ( Pitch : 28", diameter :23,5", and six blade). recent sea trial test result show that the engine (CAT 2 x 570 HP) is run in a overload condition for a normal speed operation. then i intend to make an evaluation especially the "matching" problem, thus i need an open water characteristics data for the propeller mentioned above.
i've been searching for it and i haven't got it yet. where can i find this data?
please, i need a help here..
thank you very much

[marshmat]

Surface drives are SO sensitive that they must be individually matched to each boat; I'm not aware of any accurate prediction method for them. Your engines are overloading, you say... at what RPM? what's their rated RPM? normal RPM?

The reason you can't find the data you want is probably because it may not exist. Propeller salesfolk usually guess with a bit of nasty math, but they'll always do sea trials on several props to find what's actually right. And it depends very much on the boat, engines and use.

[yokebutt]

Concur with Marshmat, a bit of empirical research might be in order.

Yoke.

[Thunderhead19]

I have found that the engineering department at Arneson Industries are a helpful bunch.