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Jack plate question

Old 10-17-2019, 04:47 PM
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Default Jack plate question

I have decided to add a jack plate to my boat. She is Parker 800 Weekend 2013 (26 feet, ~6000 lbs).
She is rated for 250 HP and she has Mercury Verado 250 (I6).
The boat and I are from Europe. Jack plates are rather uncommon here. So, I need your advice please.

I would like to buy Bob’s 6’’ Extreme Gen 3 jack plate. It is 85 lbs. Verado is already 670 lbs. It is probably the heaviest 250 hp on the market.
My concern is the transom. Will it be able to handle the additional weight and setback long term?

Obviously, nobody can know this exactly but what is the common sense here? May this weight and setback cause mechanical problems? Sometimes I go in rough sea.
Currently the transom looks perfect. It is about 3’’ thick and has a backing plate.

Thanks!
Old 10-17-2019, 08:01 PM
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What exactly are you trying to gain by installing a jack plate?.
Old 10-18-2019, 03:12 AM
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Originally Posted by Gnrphil View Post
What exactly are you trying to gain by installing a jack plate?.
My main goal is the fuel economy. The boat is heavy and I have a hard time finding a good prop.
The engine is installed at an incorrect height now. Considering all this it will take a number of height readjustments anyway. So my idea is to install a hydraulic jack plate to save time and efforts.
Plus, it should allow fine tuning depending on the sea condition.
Old 10-18-2019, 06:45 AM
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Originally Posted by Serus View Post
My main goal is the fuel economy. The boat is heavy and I have a hard time finding a good prop.
The engine is installed at an incorrect height now. Considering all this it will take a number of height readjustments anyway. So my idea is to install a hydraulic jack plate to save time and efforts.
Plus, it should allow fine tuning depending on the sea condition.
Heavy motor + jack plate is just moving that weight further back.

I would reevaluate your plan.
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Old 10-18-2019, 08:30 AM
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Originally Posted by UncleLuke View Post
Heavy motor + jack plate is just moving that weight further back.
I would reevaluate your plan.
Can't agree with this. Engine mounting height significantly affect the performance and economy.
Different props require different deps as well. The plan is that hydraulic jack plate will help with this.
Old 10-18-2019, 09:39 AM
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Get a 4 or 6 inch setback plate and weight won't be an issue. You will love what you can do with the Jack plate
Old 10-18-2019, 09:42 AM
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Have you tried contacting the manufacturer and asked if they have any insight? They would be most familiar with the load limits of the transom.
Old 10-18-2019, 09:45 AM
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Originally Posted by Serus View Post
The engine is installed at an incorrect height now. Considering all this it will take a number of height readjustments anyway. So my idea is to install a hydraulic jack plate to save time and efforts.
Plus, it should allow fine tuning depending on the sea condition.
I don’t see the need for a hydraulic one, a manual one will allow you to fine tune it, just not while on the go. Once it is set at the correct height, I don’t see the need for you having to adjust the height for sea conditions in that boat. Bob’s makes some very minimal set-back manual jack plates that are not very heavy.
Old 10-18-2019, 10:35 AM
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If you are thinking that it may take several times of moving the engine to a different position and you are paying a mechanic to do it gat the jack plate. This will allow you to adjust it to any sea condition. You don’t have a performance type boat that you are trying to get more mph but you will get better efficiency and control vs a fixed position. You can run the engines high and have less drag or lower and more bite.
Old 10-18-2019, 10:55 AM
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Send some pictures of what you have.
Yes the jackplate allows relatively infinite adjustment throughout its range but you must have the basics correct first.
You should get the prop, engine height, WOT rpm correct before you change the geometry.

Otherwise you are throwing money, time and effort at the problem and creating a whole other set of variables.

Where are you and what is your prevaling sea state and what is your boating objective?
Black Sea?

You already spent a bucket of money either transporting the Parker or buying it there, sometimes more money is not the answer.
Old 10-18-2019, 12:12 PM
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Couldn't that boat come with twins? I had to look it up. That Parker looks totally different then the Parker boats here in the States.

Does it look something like this?




Max Hp is 300 but it doesn't look like i could take twins. Plus the 230 L (roughly 60-61 gallon) fuel tank says single engine to me. Looked up the boat that is what the specs say. I would say see how the boat sits with more weight on the transom. Get a full grown adult guy to stand on the transom by the engine and see how the boat sits. Hopefully the person id 80 kilos or more.

Old 10-18-2019, 03:39 PM
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Thanks for all the feedback!

I think there is a confusion here. Parker in the US has nothing to do with Parker (Poland made) in EU.
This is the exact boat as on the picture above. I would love to post some pics of mine but may not do this because of the THT limitation for the new users. Need to make 10 posts first.

Originally Posted by MDMako25 View Post
Have you tried contacting the manufacturer and asked if they have any insight? They would be most familiar with the load limits of the transom.
For some reason they do not reply. No good...
Old 10-18-2019, 03:41 PM
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Originally Posted by PeteH View Post
Send some pictures of what you have.
Yes the jackplate allows relatively infinite adjustment throughout its range but you must have the basics correct first.
You should get the prop, engine height, WOT rpm correct before you change the geometry.
I do have a pretty good experience and understanding about this stuff. I am sure that the height adjustment is the fine but essential tuning in my case.

Originally Posted by PeteH View Post
Where are you and what is your prevaling sea state and what is your boating objective?
Black Sea?
I am from St. Petersburg, Russia. I travel in Baltic sea, the Gulf of Finland, Ladoga lake, etc. I like go calm water but long distances. Gas here is expensive (e.g. $6 per gallon in Finland). So the fuel efficiency is important.
Old 10-18-2019, 04:50 PM
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Originally Posted by 4thFin View Post
Couldn't that boat come with twins? I had to look it up. That Parker looks totally different then the Parker boats here in the States.
...
I would say see how the boat sits with more weight on the transom. Get a full grown adult guy to stand on the transom by the engine and see how the boat sits. Hopefully the person id 80 kilos or more.
The boat cannot have twins. She sits very well with an added height on transom. I have an additional fuel tank of 60 gallons in the very rear.

Again, my main concern is the mechanical/structural durability of the transom. I plan to keep the boat for many years. What makes more stress? It is when the engine gradually pushes 7000 lbs forward or when the engine (600 lbs) jumps hard on the waves?

I see you guys in the US like jack plates. Some have really crazy setups. So I hope to get some feedback on how this work on the transom long term. Maybe this is not a problem at all.
Old 10-19-2019, 01:51 AM
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Name:  b32006123702f28cb46b4c124c31155d1387804572.jpg
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Size:  19.8 KBDetwiler D3000 Hydraulic jack plate Model: Pro Trim operated

Looks like these are available on this side of the pond.
Rated for 283kg and 300hp.
I don't think you should have any concerns about your transom.
Old 10-19-2019, 02:41 PM
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Why don't you start my mounting the engine the correct height on the transom?.
Then go from there.
Thats a big heavy boat,chances are your not going to see a big performance increase.

Ive had Jack plates on several boats,both manual and hydraulic.I'm parcel to manual.
Find the sweet spot and lock it down.Works great til you need to get in skinny water!

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