Firewall/support gap
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Firewall/support gap

  1. #1
    Member leprekawn114's Avatar
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    Default Firewall/support gap

    I searched a little but couldn't find a definite answer. When making a firewall or forward support under the bow does there need to be a gap between the floor and ceiling of the bow for flex? Or can you just glass the bottom of the firewall to the floor and the top to the ceiling of it? I'd like to have a firewall in front and a support that runs the whole length of the bow from floor to ceiling.

    My bow is completely hollow and the only support it has is a 3"x1" piece of wood glassed in running from the dash to the tip of the bow that tapers to almost nothing in the front.

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    "Need For Speed" Gearhead's Avatar
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    The portion of support in front of your feet is referred to as a "kickboard". A firewall is the portion in an automobile between the engine and drivers compartment. The kickboard in most boats is an integral part of the skeleten of support of the boat. It helps the hull keeps the original shape. The kickboard in most boats is generally an integral part of the lower half of the hull. The shape should follow the contour of the boat, including the floor, and should be glassed in. On most boats the top, above the side of the lower half, is open. But one can glass this in as well.

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    Last edited by Gearhead; 04-12-2011 at 06:03 PM.

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    TRG
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    if its a light weight boat I would recommend that you elevate the wood off of the floor by using stirring sticks, tab the bulkhead into place with a few strips of glass, remove the sticks when the tabs cure, then go about glassing the bulkhead into the boat 100%, I have heard it being called a "Floating" bulkhead, the theory behind this is to give absorption to the vertical bulkhead in the event the hull takes a hit at speed, been doing it this way for some time and seems to be working out well
    A few years ago I had a buddy that bought a beautiful light weight CP 18' Gullwing, he was testing a blown injected deal in it out at senators wash in Yuma AZ, the boat took a good hit and the bulkhead pushed through the floor causing the bottom of the boat to tear out on the outside of the stringer (Driverside) at the bulkhead, clean through the transom, the boat was destroyed!
    Ask questions around here, there are quite a few sharp tacks here that will learn ya right!

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    Senior Member ol guy's Avatar
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    Quote Originally Posted by TRG View Post
    if its a light weight boat I would recommend that you elevate the wood off of the floor by using stirring sticks, tab the bulkhead into place with a few strips of glass, remove the sticks when the tabs cure, then go about glassing the bulkhead into the boat 100%, I have heard it being called a "Floating" bulkhead, the theory behind this is to give absorption to the vertical bulkhead in the event the hull takes a hit at speed, been doing it this way for some time and seems to be working out well
    A few years ago I had a buddy that bought a beautiful light weight CP 18' Gullwing, he was testing a blown injected deal in it out at senators wash in Yuma AZ, the boat took a good hit and the bulkhead pushed through the floor causing the bottom of the boat to tear out on the outside of the stringer (Driverside) at the bulkhead, clean through the transom, the boat was destroyed!
    Ask questions around here, there are quite a few sharp tacks here that will learn ya right!
    Agreed 110%. 3 things a boat needs for structure support. "bulkhead and gunnel supports. take them out and watch the boat come apart! M

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    Member leprekawn114's Avatar
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    That's exactly the answer I was looking for! Thank you Also, this is my first attempt at glassing anything...so how many fiberglass cloths would you guys recommend layering? I'm guessing it will take a couple layers to make it solid

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    Senior Member ICECREAMAN's Avatar
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    Quote Originally Posted by ol guy View Post
    Agreed 110%. 3 things a boat needs for structure support. "bulkhead and gunnel supports. take them out and watch the boat come apart! M

    Well? I'll ask, whats the third thing?

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    Senior Member back2k5's Avatar
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    I would imagine it would be the stringers

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