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<blockquote data-quote="srimes" data-source="post: 225331" data-attributes="member: 6924">I&#039;m hoping yall can give me some good advise on this.&nbsp; I searched on google and that&#039;s how I fount this forum, a few posts from pappy telling people how to set up jack plates on jon boats.I have a 97 grumman 14&#039; with a 25hp johnson.&nbsp; It has a 20&quot; transom, but the cav (anti vent) plate sits 2&quot; below the bottom and&nbsp; a lot water shoots up the leg.&nbsp; If I set the trim pin in all the way it sprays up so much water I can barely see the motor!&nbsp; So I order the mini-jacker from basspro to raise it up, along with a tach and water pressure gauge.I installed the gauges (not the jack plate yet) and borrowed a gps and found that the boat did 27mph with the motor in the highest trim setting.&nbsp; The tach showed 4600 rpm but I had it set at 6p when it should be 5p, so I think it was really turning 5500.&nbsp; That works out to 13% slip with the 10 x 13 prop.&nbsp; I think I can get this at least in to the low 30s, if not mid 30s.&nbsp; I ordered a solas amita 4 blade 10x15 prop.&nbsp; I went with the 4 blade as I figure it&#039;ll let me raise the motor higher because it&#039;ll have more bite than a 3 blade.So how high should I set the motor?&nbsp; The mini-jacker isn&#039;t adjustable itself.&nbsp; I saw a post where pappy suggested 2-2.5&quot; above the bottom.&nbsp; Since I&#039;ll have a 4 blade prop I was thinking of starting at 2.5&quot;.&nbsp; Any thoughts?</blockquote>

[QUOTE="srimes, post: 225331, member: 6924"] I'm hoping yall can give me some good advise on this. I searched on google and that's how I fount this forum, a few posts from pappy telling people how to set up jack plates on jon boats. I have a 97 grumman 14' with a 25hp johnson. It has a 20" transom, but the cav (anti vent) plate sits 2" below the bottom and a lot water shoots up the leg. If I set the trim pin in all the way it sprays up so much water I can barely see the motor! So I order the mini-jacker from basspro to raise it up, along with a tach and water pressure gauge. I installed the gauges (not the jack plate yet) and borrowed a gps and found that the boat did 27mph with the motor in the highest trim setting. The tach showed 4600 rpm but I had it set at 6p when it should be 5p, so I think it was really turning 5500. That works out to 13% slip with the 10 x 13 prop. I think I can get this at least in to the low 30s, if not mid 30s. I ordered a solas amita 4 blade 10x15 prop. I went with the 4 blade as I figure it'll let me raise the motor higher because it'll have more bite than a 3 blade. So how high should I set the motor? The mini-jacker isn't adjustable itself. I saw a post where pappy suggested 2-2.5" above the bottom. Since I'll have a 4 blade prop I was thinking of starting at 2.5". Any thoughts? [/QUOTE]

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