Stringer Strength?
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Stringer Strength?

  1. #1
    What the Hell is That? 72Hondo's Avatar
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    Default Stringer Strength?

    So last night I started to think about boats and stringers. How do the stringers add strength to the hull? I get the obvious glassed in but where does the strength come from? From full to 1/4 stringers, is it stronger length wise or Beam wise? You always hear "it's a full stringer boat" How much more durable is full stringers as oposed to 1/4 stringer?

    Any difference between jet and Vdrive stringers? This question is open to all hulls.

    Did one guy just say "Hey we can throw two peices of wood down the length of the boat and it will be 10X stronger than a boat with 1/4's?"
    Quote Originally Posted by Kyle View Post
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    I'm famous ! Lucky's Avatar
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    Full stringer boat all the way ..

    a full stringer will create a more rigid foundation for absorbing shock and reducing flex and also distubting force . larger the stringer stronger the boat . a stringer is the the frame rail of the boating world .. quarter stringers are the unibodies ...
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    Senior Member lbhsbz's Avatar
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    I've had 2 boat's with 3/4" stringers in it....I've always felt a bit leary of bolting 600+ hp to similar pieces of wood that I use for Facia board on my house. It also amazes me how a handful of little 5/16 screws and some epoxy hold the pump down against all that hp.

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    What the Hell is That? 72Hondo's Avatar
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    Let me rephrase the question. How do the stringers, (no matter what length; Full, half, quarter) Make the hull stronger? Is there a percentage? Why is a boat with full stringer stronger than one with 3/4?

    Or

    Why add stringers and not lay up heavier? I am looking for the exact purpose stringers were put in, no matter what length thickness or density.

    Does it add to Beam strength? Transom strength? Nose to tail strength? Just something to hold the motor in there?

    Why were stringers put in in the first place?

    To make the hull stronger, OK but how?
    Quote Originally Posted by Kyle View Post
    Log off and go float, hang in the party coves, Show and shine on the trailer, fill up the boat, wax it, v-drive, jet, outdrive, and if you got a canoe and your reading this, you sir, need to phucking upgrade.

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    to demonstrate this effectivly - take a two identical pieces of cardboard , glue on two popsicle sticks on one of the peices and Tape over the makeshift stringers

    Now take the other piece as is ....

    block each end of both cardboard peices a 1" off a hard surfaces . Now take your finger and push into the center of each and i believe you will understand the princiable ----

    then take both pieces firmly in both hands and Twist each - see what one is more difficult to destroy ..


    A stringer adds ridgidness - glass and wood grain is the streanght of the part .
    " my carbon footprint is gonna kick your green ass"


    Quote Originally Posted by 396_Ways_To_Spit View Post
    WOWO!!!!! THat has to be the most beautiful crank that Ive ever seen!!!!!!!!!!!!!!!!


    Quote Originally Posted by MAXIMUS View Post
    He has been allowing me to park my equipment in his backyard for a few years now...
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    Senior Member skippers WFOT's Avatar
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    or just like a house with the floor and ceiling joists. you would probably be ok (im in no way saying this is ok)if you laid 3/4 ply over joists that were 48 on center, but how much stronger if its 16 oc
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    Default 1/4 stringer

    A 1/4 stringer boat, with a glassed in 3/4 plywood floor is plenty strong enough for recreational use. If a recreational boat flexes a bit, it is no big deal. In fact that 'flex" is actually desirable to rigid in a lot of rec applications. Once you throw a bunch of HP to it, and expect it to run well over 50, the full stringer rigidity prevents twisting the hull in ways it wasn't meant to twist... 1/4 stringer hulls have been around for a long time, and unless the glassed in floor starts to deteriorate, will last a long time under "normal" use...... Are full stringers better? Well, yeah....Are they required in a recreational jet boat? No..... Are they required in a "light lay up" flatbottom, you bet, as are gunnel supports, kick boards, strut braces etc etc...It's all about the use, recreational, or balls out racing, glass or chop, huge rollers etc etc.....Ray
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    Quote Originally Posted by skippers WFOT View Post
    or just like a house with the floor and ceiling joists. you would probably be ok (im in no way saying this is ok)if you laid 3/4 ply over joists that were 48 on center, but how much stronger if its 16 oc
    Eeh, use t&G or block the joints and you will be fine. I would not lay ceramic tile on it as it will be a little spongy. On a roof it would not be all bad especially if the pitch was steep.

    I am still waiting for the engineers to chime in about the stringers with latteral force calcs etc.
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    Quote Originally Posted by Lucky View Post
    Full stringer boat all the way ..

    a full stringer will create a more rigid foundation for absorbing shock and reducing flex and also distubting force . larger the stringer stronger the boat . a stringer is the the frame rail of the boating world .. quarter stringers are the unibodies ...
    Good, simple, straight to the point post!

  12. #10
    "BOATLESS" blender over's Avatar
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    Quote Originally Posted by Moneypit View Post
    A 1/4 stringer boat, with a glassed in 3/4 plywood floor is plenty strong enough for recreational use. If a recreational boat flexes a bit, it is no big deal. In fact that 'flex" is actually desirable to rigid in a lot of rec applications. Once you throw a bunch of HP to it, and expect it to run well over 50, the full stringer rigidity prevents twisting the hull in ways it wasn't meant to twist... 1/4 stringer hulls have been around for a long time, and unless the glassed in floor starts to deteriorate, will last a long time under "normal" use...... Are full stringers better? Well, yeah....Are they required in a recreational jet boat? No..... Are they required in a "light lay up" flatbottom, you bet, as are gunnel supports, kick boards, strut braces etc etc...It's all about the use, recreational, or balls out racing, glass or chop, huge rollers etc etc.....Ray
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