SoCal Jet Boats
Tech Talk => Hulls => Topic started by: Ken on June 14, 2014, 02:04:10 PM
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When describing STRINGERS, I hear 3/4, full, partial, 1/2, etc.
When referring to those, what exactly are we talking about?
3/4 goes 3/4 of the length of the boat??
Partial would be half the boat??
I have an "engine box" that's 4feet from the transom, then the stringer is in the center of the hull and is 10 feet towards the bow from the "box" and the boat is 18feet overall length. Is it a 3/4 Stringer??
Since I'm replacing the stringer and the front of the engine box, I'm thinking about removing the 4 feet of the engine box sides, and putting 2 stringers from the transom all the way forward, and terminating them in the front of bow like the original center single one, just on the sides.
Getting the supplies isn't an issue, doing the job RIGHT is what I am concerned with.
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I'm no expert but my understanding is the stringers are the 2 board on the side of what you're calling your engine box... So I'd say you have a 1/4 stringer boat and possibly a previous owner added the singe... But IMHO it would be WAY BETTER to yank those out and run 2 new stringers all the way to the bow... Which, as I understand it, would make it a full stringer
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When describing STRINGERS, I hear 3/4, full, partial, 1/2, etc.
When referring to those, what exactly are we talking about?
3/4 goes 3/4 of the length of the boat??
Partial would be half the boat??
I have an "engine box" that's 4feet from the transom, then the stringer is in the center of the hull and is 10 feet towards the bow from the "box" and the boat is 18feet overall length. Is it a 3/4 Stringer??
Since I'm replacing the stringer and the front of the engine box, I'm thinking about removing the 4 feet of the engine box sides, and putting 2 stringers from the transom all the way forward, and terminating them in the front of bow like the original center single one, just on the sides.
Getting the supplies isn't an issue, doing the job RIGHT is what I am concerned with.
I may be displaying some ignorance here, but I have never heard the term "half" or "three quarter" stringer in anything.
There is full stringer, which is when the stringers go from the transom all the way past the front bulkhead.
A quarter stringer deal is just that, there is a structure around the engine for the mounts to bolt to and that is it. The strength in these comes from the keel beam and the floor.
I really like full stringer hulls because of the inherent strength and ability to handle ridiculous hp. They also typically handle rough waters a lot better with less hull stress, a full string hull typically stress cracks the hell out of the deck and the quarter typically cracks the bottom.
Converting a quarter stringer to a full is quite a lot of work, but if you really like the hull, worth doing IMHO.
The most common mistake made is when the hull is not supported very well when glassed back together. You can do it on the trailer, but it really needs to be off the bunks, I normally put the trailer on jack stands and square them up, then I will block the hull off the bunks using the corners of the rear of the trailer and the keel near the bow where the stringers will end.
There is a crap ton of grinding to do because you need to get down to fresh fiber glass and down past the area where the glass has oxidized, typically about 1/16" of the surface is yellowed and brittle glass. Use a respirator, i use a North full face. DO NOT BREATH THE DUST...
Good luck and most important, have fun doing it. If it's not fun, what the heck is the point?
GT
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Thanks GT, the terms 1/2 and 3/4 came from my search on the google, and yahoo search sites. They didn't make sense so that's why I asked here.
So I have a 1/4 stringer, but how about that 10 foot long 2X4 I have from the bulkhead on the 1/4 stringers up to the front of the bow.
It was "my" understanding I had a single stringer with an engine box style hull, but I am obviously wrong or I'm miss understanding the hull design aspect of my boat??
I have LOTS of time to do all the work, (and honestly my daughter keeps prodding me to go work on the boat instead of sitting here in the hosp. room) and already have all the supplies, 5 gallons of resin, 20 yards of 50" wide mat, and 60 yards of 6" wide "tape", and 4 pieces of 2X6X14' clean Douglas fir.
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The terms are the same no matter the hull design or construction materials.
The beam you are talking about down the middle is a keel... Never heard it called anything else.
The beams going down the sides between the keel and the outer edge is a stringer, the outer edge of the hull is typically called a gunwale (pronounced gunnel) which in a wooden boat would be the bent piece of timber around the outer edge. Below the gunwale is the chine and between the keel and the chine on the bottom of the boat would be the strake. Schools out for now. ;)
GT
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Ah fucking ha!!
It all makes sense now!! The center "keel" is what I have always thought was a STRINGER!!!!
A keel, I thought was the little fin on the bottom of the hull, like on a sailboat!?!?
And what I thought was an engine "box" is actually the Stringers!!
That's why I quit "googling" and just came here!!
Thanks for the "schooling" Glen, I appreciate it!
And gunwale isn't pronounced ... Gun-Whale? Damn, it's gunnel?
I was gonna ask the difference between a Gun-Whale and Gunnel next...ha ha ha
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GT, if I do the full stringers, do I do away with the center keel beam completely or keep it in there too? Seems like a floor stradling the 2 stringers would be very flimsy in the middle? Or are full stringer designs floorless, and then the finished and smoothed hull is the floor??
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Be careful and keep in mind your height for the floor to the top of the hull if you put in full stringers you might not want to put the floor on top of the stringers and just do a floor in between them, and the keel board also helps support the floor that used to be there
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