Re: short-shaft motor with planing fins...
Depends on what year 13 you have, Beermunk.<br /><br />If it is a 1972 or earlier (non-smirked hull with blue liner) the short shaft is correct. If it is a smirked hull it needs a 20" (long) shaft. If it is a Dauntless or a 130 I can't help you.<br /><br />BW classic 13s can be planed with as little as 10hp and a light load. I have used 9.9, 20, 25, 40 and 50hp on them and a 35, even the old crank rated 35s, is good for over 30mph WOT.<br /><br />Some hydrofoils (planing fins) help with lower planing speeds and less porpoising when trimmed out, but are definitely not required to get your boat to plane.<br /><br />You would help helpers here a lot if you would tell us exactly what model and year boat and engine you are talking about. Boston Whaler has been making various 13' boats for over 40 years and Johnson 35s have been around in different versions for even longer.<br /><br />Now I am going to move this to Outboard Non-repair Discussion.<br /><br />Good luck.
