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Author Topic:   13 performance with jackplate
JimU posted 04-11-2002 10:06 AM ET (US)   Profile for JimU   Send Email to JimU  
I'm consiodering a installing a jack plate with 5-6 inches of set back on my 13 sport. It has a new 40 yam 2-stroke. How can I expect performance to change? thanks JIM
Bigshot posted 04-11-2002 01:24 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Not much. Will make a slight difference but can't get blood from a stone:)
jameso posted 04-11-2002 02:26 PM ET (US)     Profile for jameso  Send Email to jameso     
My 03 and experience. I have a 15 sport with 50 HP, OMC, engine is strong. After reading about stand off's-jack plates ect, I experimented. First raised engine aprox 3 inches. Some noticed improvement in hole shot and increase in top end of about1 1/2 2 mph. Installed 4 in setback plate, local mfg. No increase in top speed and no noticable increase in hole shot. Same prop all tests. Thought the plate looked wierd and seemed to change my static trim, engine weights approx 200 so 4 in offset,,,Now running no plate 3 inches above transom. Happy. I do know that raising engine and a set back will allow a boat to plane in shallower water but how much and is it worth it???Like the man said no "free" lunch.
Jim Armstrong
JFM posted 04-11-2002 02:37 PM ET (US)     Profile for JFM  Send Email to JFM     
Jim Armstrong, is your cavitation plate 3" above the transom with motor mounted directly to your boat?
Thanks, Jay
Bigshot posted 04-11-2002 03:20 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Jay I had my 70 about that high off he transom. You could see the trim pump. If I went the next hole up it would howl and I needed the whole river to turn aroung:) The cavitation plate was about 2+" above the hull. That is why I said raise your engine on your 13. Just do the top bolts and if you like the way it handles, drill the bottom 2. If not drop it onto the transom and use lags. If you nix the plate idea of course.

I am amazed at how high my 70 is off the transom and how normal she drives(gonna raise it 1/2"). My engine is literally 3+ inches off the transom.

Bigshot posted 04-11-2002 03:22 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Oops! the first paragraph pertained to my 15' with 70 Johnson/no jack plate. My 2nd is my Montauk with 70 Evinrude on a plate.
Dr T posted 04-18-2002 06:57 PM ET (US)     Profile for Dr T  Send Email to Dr T     

Glad you can keep your boats straight. I was beginning to wonder.

Any new acquisitions?

By the way, Browning20ga stated that he was considering a CMC PTT which would give about 3 in lift and a 5 in setback. Has anyone tried this setup yet?


Bigshot posted 04-19-2002 10:53 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Almost done with restoring my 76 13'. Gonna finish buffing it out, slap a fresh coat of bottom paint on her and start putting the wood back in. This was the toughest resto I have ever done. She is gonna be pretty though.
Dr T posted 04-19-2002 03:03 PM ET (US)     Profile for Dr T  Send Email to Dr T     
You going to post pictures?


Bigshot posted 04-19-2002 03:11 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     

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