However, doing so results in a boat that only likes "very flat water" and only likes to go in a "straight line". If top speed is your only goal you go with alot of setback and mount as high as you can (while still keeping the waterpump intakes in the water). On a rig "capable" of reaching 50 mph, Merc already recommends mounting the outboard 1/2" higher than normal so if you also ran a 4" setback you would raise the motor so that the cav plate is 1" above the lower edge of the transom instead of directly in line. Since I work on Merc's (in addition to rigging), I have am familiar with their data. Additionally, most outboard mfg's have mounting height instructions for each of their models. So, if I'm going 48, and the jackplate will allow me to go 50, and I can do it without spending any money, why not right? Goal met!Īs noted, a common issue with jack's is "undesireable" side effects such as poor hole shot, slip in a turn and sucking air when the lower unit breaks the surface.Īlthough there are no hard and fast rules, in general, for each 4" of setback you raise the motor about 1/2" higher than where you would normally mount it. So this is actually why I am asking, as it seems like a fairly straightforward design that could net a few MPH if nothing else. My goal for this boat build is 50 MPH, so I figure anything I can do to inch me towards that mark can't hurt right? I understand what you're saying about the cost/speed-gain ratio not being so good however, I am a welder/fabricator by trade so I've definitely got the material and skill on hand to fabricate one.
#HIJACKER JACK PLATE CATAMARAN MANUAL#
Galamb wrote:I run a TH Hijacker (4 inch set back), manual adjust.
The only sure way to make a noticable difference in your top speed is to remove your current motor and replace it with one that has significantly more horsepower.
#HIJACKER JACK PLATE CATAMARAN INSTALL#
Even if you do the install yourself a low end plate will run you a couple hundred bucks - so is each extra mile per hour worth 100 bucks a piece?
It will not produce any difference that you will actually notice. If you are simply looking for more speed, save your money. If you boat less than 100 hours a year it is unlikely that it will ever pay for itself in terms of fuel savings. I rig outboard powered boats and personally believe that any motor greater than 125 horses should be on a jack as opposed to being bolted right to the transom (if done at initial purchase) but when asked if the cost is justified when done as a retrofit it always comes down to "how much do you run your boat". Since you fiddle with it and find an optimal engine placement which in turn reduces a little bit of drag you end up burning less gas (again though I'm talking a few less ounces per hour, not gallons) which over many seasons does result in many hundreds of gallons saved if you boat alot. To get a 15% performance increase (read top speed) you need to increase your horsepower by 50% - you can't get even remotely close to that with "add on's".Ī correctly adjusted jack plate may (MAY) result in a 5% performance increase, but usually somewhat less than that, so if your rig is already doing 50 mph you may see 52 on a good day.Ī jack's real benefit is seen in terms of years. Yes, you can increase your speed running a jack, but you really need to put things into perspective.Ī boat with an adequate motor that is kept tuned and a properly matched prop is just about as good as it gets in terms of performance.Īdding a fin, jack, trim tabs or any of the thousands of items claiming to increase performance do so but the amount is quite small. I run a TH Hijacker (4 inch set back), manual adjust.
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