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Author Topic:   Jackplate on a 15' Stripper
BearsWhaler posted 06-15-2004 01:45 AM ET (US)   Profile for BearsWhaler   Send Email to BearsWhaler  
I have a 1983 15' Stripper and am considering putting a jackplate on the motor so I can run in shallow water out in the bay. Has anyone done this and what were the results? Also can you recomend any brands. I'm running a 1984 Johnson 70. Thanks.
G MASTER posted 06-15-2004 12:04 PM ET (US)     Profile for G MASTER  Send Email to G MASTER     
Putting a jack plate on a stripper is illegal. Putting a jackplate on a striper may be an excellent idea.


BearsWhaler posted 06-20-2004 12:58 AM ET (US)     Profile for BearsWhaler  Send Email to BearsWhaler     
You crack me up! I'll be getting help on spelling soon! See you on the water again soon!
Striper15 posted 09-08-2011 07:49 PM ET (US)     Profile for Striper15  Send Email to Striper15     
Old thread, same question except 15' Striper with F70 added hydraulic jackplate.

Please comment on expectations of performance. Would jackplate affect hole shot, top end, porpoising? How about shallow water planing and navigation?

Thanks for your comments

Tohsgib posted 09-09-2011 11:41 AM ET (US)     Profile for Tohsgib  Send Email to Tohsgib     
Hydraulic is a lot of weight. Len had one on his 15 with a 90 E-Tec and it did little for performance over a fixed plate but aided in skinny waters. I would go with a fixed as you pretty much set it and forget it about 4" above the keel or so. Hydraulic may get you another 2" but then you need a low water pickup, etc.
dgoodhue posted 09-09-2011 01:00 PM ET (US)     Profile for dgoodhue  Send Email to dgoodhue     
I have a fixed 5" jackplate. My motor is 4" raised. The is atleast 1.5" higher than if I was running on the motor directly on the transom. Top speed seems to increase 2-3 mph. You can also reduce chine walk with the jackplate by raising the motor. My hole shot is still good and my boat nose doesn't go too high getting on plane unless I am going into stiff wind (20mph)

The boat should not porpoise unless you trim the motor out for top speed and throttle back for a cruise. If it porpoising the motor usually mounted too low.

Striper15 posted 09-09-2011 01:16 PM ET (US)     Profile for Striper15  Send Email to Striper15     

Who are recommended manufacturers of high quality, lightweight fixed jackplates?

tedious posted 09-09-2011 02:40 PM ET (US)     Profile for tedious  Send Email to tedious     
Dave, when you say your motor is 4" raised, do you mean that your AV plate is 4" above the keel? My F70 is on the transom, two holes up (one hole below the very top hole it could go in) and my AV plate is about 1" above the keel. I do get some porpoising, although it's hard to tell 'cause much of the summer was spent in snotty water. I was thinking about going up that last hole to see if it makes a difference, and may also think about a jackplate eventually.

To Striper - I like the looks of the Hydrodynamics jack plates - they have a single-bolt adjustable one, the EZlift, that is what I would go with for an on-water adjustable plate. They also have a product called a Simple Jack that is just angle iron with slots - it's not on-the-water adjustable, but is lighter.


Tohsgib posted 09-09-2011 04:05 PM ET (US)     Profile for Tohsgib  Send Email to Tohsgib     
My Montuak I was 4.5" above the keel with a Vance 5" setback($150). I dialed it in and never touched it again. You will need a good prop like a Stiletto or ?? that will grip when jacked. A stock SST won't handle 4" that well. An aluminum...NO WAY. I had my SST worked on and with a very aggressive cup it did the job on my 15. The Montauk had a Suzuki which is made by the same company that makes Yamaha, Stiletto, Turbo, etc.
dgoodhue posted 09-09-2011 05:23 PM ET (US)     Profile for dgoodhue  Send Email to dgoodhue     
Yes, I am about 4" above the keel with my Stilletto prop. I put a straight edge on the keel and measured from the straight edge to the cavatation plate.
jharrell posted 09-10-2011 11:38 AM ET (US)     Profile for jharrell    
My CMC Hydraulic jackplate is 45 lbs. On my Montauk the extra weight made almost no difference that I could tell, but I already have a kicker back there at 65 lbs too. The drain holes are just in the water at rest, but they a where before as well.

I manual setback will get you more speed on a plane and let you go a little shallower once you get it dialed in, while being lighter.

The hydraulic does give you some versatility though that I really like. For instance when trolling around I can pull it all the way up 5" and tilt the motor less to completely clear the keel and creep around in less than 12" of water. In open water especially in rough seas sometimes it is nice to put it all the way down for better bite.

Bob's has a lightweight hydraulic jackplate for up to 115hp that comes in at 29 lbs, but the pump is separate and has to be mounted elsewhere. I didn't like that arrangement so I went for the heavier CMC that incorporates the pump. In a 15 this would be more critical so if you want powered I would hard at the Bob's and find a place for the pump.

Fixed is going to be cheaper and lighter and less to go wrong for sure. I have to say though being able to adjust the plate with a switch is nice and I use it every time I go out.

grosseile88 posted 09-12-2011 11:07 AM ET (US)     Profile for grosseile88  Send Email to grosseile88     
I recently installed the CMC manual unit (purchased from area Bass Pro Shop) with 5 1/2" of set back on my 1985 15' Super Sport with 1985 Evinrude 70. Huge upgrade in handling, faster hole shots, reduced porpoising and increased top speed. Although I do need to change current SS prop pitch from my 17" pitch to a 19 or 21 to realize full benefits.

Most likely your engine like mine was mounted all the way down using the blind holes. You will have to re-drill plate were it mounts on transom which is easy. I mounted my engine two holes up on plate then dialed it in rest of way with jack plate adjustments.

I have pics I can send you of installation and finished product if that will help.

tedious posted 09-12-2011 11:11 AM ET (US)     Profile for tedious  Send Email to tedious     
I am not the original poster, but I would like to see your pics, if possible. Thanks.


grosseile88 posted 09-12-2011 03:21 PM ET (US)     Profile for grosseile88  Send Email to grosseile88     

Shoot me an email and I will send them.

grosseile88 posted 09-12-2011 08:23 PM ET (US)     Profile for grosseile88  Send Email to grosseile88     
Sorry sent wrong e mail address. Copy and paste link below for all the photos or email me at Engine mounting pics are toward the end.

tedious posted 09-12-2011 08:31 PM ET (US)     Profile for tedious  Send Email to tedious     
Thanks, I appreciate the pics.


Striper15 posted 09-12-2011 09:39 PM ET (US)     Profile for Striper15  Send Email to Striper15     
Tedious, Thanks for the rply. I will look into the Hydrodynamics plate.

Gross, thanks for the pics target=ALBUM&id=5651630438384416161&authkey=Gv1sRgCLefh_X5q_O00wE& feat=email

Couple of questions:
Can you adjust your plate on the water?
What is the weight?

Thanks again!

grosseile88 posted 09-13-2011 08:39 AM ET (US)     Profile for grosseile88  Send Email to grosseile88     
Yes you can adjust on the water. You loosen up the two lock bolts on each side of plate then there is one large threaded bolt/rod that raises and lowers the plate. This can be done from the top or bottom of the plate. Seems cumbersome but is not that bad.

The thing weighs about 25-30 lbs top.

tedious posted 09-28-2011 11:37 AM ET (US)     Profile for tedious  Send Email to tedious     
Well, I have the Hydrodynamics HDEZ-50 installed, but not tested. As a starting point, I have the AV plate 3.5" above the keel - that is, the distance from a straightedge extending the keel line to the AV plate is 3.5" with the motor trimmed so the plate is parallel to the straightedge.

Dave, is that consistent with your measurement technique? I have to say, the motor seems awfully high sitting on the trailer - but I guess that's the idea!

Unfortunately, the test run has to be a couple of weeks away.


dgoodhue posted 09-28-2011 05:54 PM ET (US)     Profile for dgoodhue  Send Email to dgoodhue     
Tim, Yeah I measured it that way. I was surprised as well as how high the motor looked after I was done adjusting. 3 1/2" is probably a good place to start with a stiletto.
tedious posted 09-28-2011 07:28 PM ET (US)     Profile for tedious  Send Email to tedious     
Thanks Dave! I am looking forward to trying it out. I did get the water pressure gauge for my F70, so I will also be interested to see if the lift has any effect on that.


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