I never liked the 1980's era V-W Pathfinder diesels, but others will tell they are an excellent, reliable, & long-lasting diesel.
40 or 50 HP should be adequate for a 10,000 Lb Trimaran.
The older V-W “Pathfinders” were rated 40HP
Pathfinder Marine Inc. used to service & sell parts for these diesels: Pathfinder Marine Inc.
16753 boul Hymus
Kirkland, Quebec, H9H 3L4
Phone: 514-695-6676
Fax: 514-695-1086
Website (appears “dead”):
www.pathfindermarine.com
Alternate address: Pathfinder Marine Inc.
8 Linden St
KIRKLAND, Quebec, H9H 3K6
Telephone: (514) 695-6676
Fax: (514) 695-1080
Volkswagon Marine Downloads (current engines): ➥ Volkswagen Marine - Superior Technology And: ➥ Volkswagen Marine - Superior Technology SDI 50-4 (50HP @ 3000RPM) Performance Specs ➥ http://www.vw-m.de/fileadmin/PDFs/en...SDI_50-4_e.pdf