Hi, first, excuse my english.
I am in the process of buying an old 44' rescue boat.
http://home.online.no/~lawford/xrl/xrl.htm, and restoring it.

It was originaly equiped with detroit diesel, serie 53. ± 200 hp

Cruising speed was 13 kn and top, 16kn.

Now, the engines are twin cummins 220hp at 220 RPM
The gear box are different, one is a twin disk 2.0 to 1.0
The other is a Borg warner 2.5 to 1.0

The prop are 24 x 20 3 blades.

I would like to restore the original performances of the boat, without
changing the engines.

What combination of gear box and prop i need ?

Thank you

Sylvain
Baie-Comeau, Québec

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