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Author Topic:   jack plate for 13
JimU posted 01-15-2002 08:50 AM ET (US)   Profile for JimU   Send Email to JimU  
I am considering putting a jack plate on my 13 with new 40 -50 hp Merc or Yam. Any experience out there with appropriate amount of width of plate for the right amount of set backfor this boat and engine combination? A local custom builder makes them up to 12 12 inches.
Bigshot posted 01-15-2002 03:07 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
12 inches is way too big and way too $$$. Go with a 5 or 6" setback. It is gonna add weight back there as well. Clark is the man on that area. I just put 1 on my 17 but that is a bigger boat. 13's tend to porpoise normally, be careful.
Flipper posted 01-15-2002 11:41 PM ET (US)     Profile for Flipper  Send Email to Flipper     
Yeah, go with a 5", I'd say. Get the lightest plate and the lightest engine of that H.P. range -have low(er) weight at least on your side in this particular application, for a better (and safer) ride.
My brother, going for speed, managed to get 45 m.p.h. out of a jacked up two cylinder Merc 40 on our old 13, back in the Seventies. The motor was a short
shaft (it was the old 'cut away' 15" transom), and it was manual start. The boat was also known to have a nice non-porpoising ride, as a result of the lower weight (my bro. also weighed only 140 lb.back then).
JimU posted 01-16-2002 09:07 AM ET (US)     Profile for JimU  Send Email to JimU     
Clark, any comments or recommendations? Thanks
Highwater posted 01-16-2002 10:03 PM ET (US)     Profile for Highwater    
You might consider the CMC vertical extensions with no setback.
Clark Roberts posted 01-17-2002 12:07 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
I have used 8 and 10 inch set-back brackets and prefer the 8"... but, I have always used 15" shaft length motors on the 20" transom and the 20" on 20" may perform differently... These are things that you have to try and fiddle with to get set-up right! Clark... Spruce Creek Navy
PS> Also I use a Doel-fin which I think holds the water to the prop and cooling intake. Watch that tell-tale cooling water stream and if it sputters or dribbles lower the engine!
JimU posted 01-18-2002 09:14 AM ET (US)     Profile for JimU  Send Email to JimU     
Thanks. JIM

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