14' Starcraft Modifications

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WTL
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14' Starcraft Modifications

Post by WTL » 15 Apr 2008, 22:57

I am in the process of totally modding my starcraft into a bass boat that meets my needs. I love this forum, have been lurkin for a while and recently I ran into a safety related issue that I wanted to bounce off you people.

I removed the bench seats first thing cause I wanted it to be more open. I want to be clear that adding them back is not an option. I have a 28 horse Johnson pushing this.


Theres ribbing all along, but no stringers as I understand it. When I took it to the lake today, it porpoised and there was a funny feeling in the little console when it did it. I hope I wasn't feeling the hull flex.



I am using the middle deck like a big bench seat, it is lower than the seats originally were but I am reusing the aluminum angles that went with the seats to add strentgh to the side.

The problem is I took it out the other day and it leaked some along the seams of each side. A little silicone made it better, but I don't want to be looking at a structural failure in the future.

Do you guys reinforce the boats longitudally, or is the aluminum hull normally strong enough?
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Naked Hull!
Naked Hull!
What I have added so far!
What I have added so far!

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Jim
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Post by Jim » 15 Apr 2008, 23:03

Welcome to the forum!

It seems the becnches were there for more support. Did you take the boat out on the water before you removed the benches?
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WTL
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Post by WTL » 15 Apr 2008, 23:10

Thanks. Glad to be posting here now.


Only took her out before with the TM on, I didn't have the outboard yet. I'm sure the benches added some support.

The middle deck is now trying to serve as a bench, so I am less worried about the boat caving in on the sides. And I still need to get the middle deck in there more solid. But I was just sorta freaked out by that bumping feeling the console had (it could have just been loose, but it only moved when it porpoised hard). I started to think about the structure length wise. Didn't know if yall address that when you do mods. I could also in theory be overpowered, and the outboard is on a 5 inch setback jack plate. Can a boat like this really break in two titanic style, or is that a wives tale?

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Post by Popeye » 15 Apr 2008, 23:16

WTL wrote:Can a boat like this really break in two titanic style, or is that a wives tale?
That's an old wive's tale. A boat like yours will just fold in half front to back like a sandwich trapping you inside while it sinks. :lol:
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Post by Waterwings » 15 Apr 2008, 23:27

flounderhead59 wrote:
WTL wrote:Can a boat like this really break in two titanic style, or is that a wives tale?
That's an old wive's tale. A boat like yours will just fold in half front to back like a sandwich trapping you inside while it sinks. :lol:
Yes, what Andy said above is possible.

Fore and aft stringer support in the bottom may help, but there are the still the sides to contend with. You know the throw-away aluminum [tin foil] pans you can get at the grocery store? Ever took one and picked it up by the sides when it had food in it, but the sides were flimsy and still wanted to twist? I believe that's what your boat may be doing (without actually seeing it in person); not positive, but it's highly possible.
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Post by Popeye » 15 Apr 2008, 23:34

Not sure what additional stress is being placed on the hull with a 5" set back jackplate either
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Post by WTL » 15 Apr 2008, 23:39

I think more than anything the jackplate is just screwing up the balance a little, making it stern heavy and prone to porpoising. It seems to have moved the center of gravity back. It only acted funny when it popped up and down.

OK, so what should I do to be on the safe side. Remember the benches arent going back in, but the floors are serving part of that purpose anyways. Does that 2 part marine foam add enough rigidity or should I look at running a length or 2 of angle up the lenght of the boat (and I suppose attatch more angle supports to the floor up the sides)?


What do yall normally do? I know for a fact I'm not the only one here who has removed bench seats.
Last edited by WTL on 15 Apr 2008, 23:41, edited 1 time in total.

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Post by Waterwings » 15 Apr 2008, 23:40

WTL,

Hope you don't think we're being too critical, but we're actually concerned about the well being of you, any passengers, and your rig.
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Post by WTL » 15 Apr 2008, 23:43

Waterwings,
not at all, I'm not touchy feely. I just want to be on the safe side too. This thing is going out on lake kissimmee with all its swells at some point, it can make the river fine I'm sure...but its gonna be taking a beating and I want it solid.

Back to the jack plate thing, the way its planing is a little off. Like the stern is just a little deep to be said to be planing, but this is at 15 mph or so and its roughly balanced on top of the water, just not like other boats I've been in.

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Post by Popeye » 15 Apr 2008, 23:50

A jack plate will make your stern sit lower. There is "another" site that actually promotes the use of a basketball, jammed in the jack plate and inflated to compensate for it. I refuse to mention that site here but we know who it is. coughBBCcough
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Post by Waterwings » 15 Apr 2008, 23:50

I'm certainly not an expert concerning jackplates, but that could be one of the problems causing the porpoising. Do you have electric trim on the motor, and able to adjust it (in/out)? If so, try trimming it in or out some and see if that helps. The Tracker I used to have would porpoise (at higher speed) if I didn't have the motor trimmed properly. As far as the foam, I don't believe it would add any real structural rigidity to the hull. There will be some more members adding some thoughts to this as soon as they see the post.
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Post by WTL » 15 Apr 2008, 23:56

I missed the basketball thing. Say what now?

Its a homeade jackplate, completely manual. I think I might fiddle with the tilt, its in the 2nd hole right now, might move it the first although I've never seen an outboard run right in the first. Could also trim it up just a hair, its a longshaft motor on a 15" transom hence the jack plate and modded transom.
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Jack plate and transom.
Jack plate and transom.

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Post by Popeye » 16 Apr 2008, 01:50

Oh, some of those guys that have more money than common sense (or deep pocket sponsors) buy those $45,000.00 bass boats with the 300hp motors put on big 'ol 10" jack plates and complain the boat sits low in the back end. One of the "fix-alls" is a basketball shoved in the jack plate opening. Supposedly the buoyancy of the basketball compensates for the motor being set back that far. Personally I think it might help some... however the entire basketball would have to be under the water line AND I don't think just one basketball has enough buoyancy to do the job.
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The next time won't be the first time I've made the same mistake twice.
All the romance of fishing exists in the mind of the angler and is in no way shared by the fish.
Do illiterate people get the full effect of Alphabet Soup?
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Post by Waterwings » 16 Apr 2008, 07:55

...however the entire basketball would have to be under the water line AND I don't think just one basketball has enough buoyancy to do the job.
Concur on that!
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Post by WTL » 16 Apr 2008, 11:25

I just don't see how that would make a difference if you are on the plane, the b ball should be out of the water.

I'm going to adjust it some today and tommorow and see if we can't strike the right balance.

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