Hi , I've used one of those drift socks on my friends 42' trawler. It got us slowed down just enough for fishing flashers. Bit of a pain in the butt to he honest .Need 5o be quite far back to "catch and open " , bit of interference on turns with rigger lines , etc. . I made a bridle up thru scuppers to get it centered . Did this to see if I could get the boat slowed down enough for sockeye . He'll be catching the fast ones... lol. I'd just fish spoons and plugs if I were fishing coho and springs. More fun without the flasher too. If you plan on fishing alot off the big boat, a 25hp kicker like mentioned above would be the ticket.