Crusader Tunnel bottoms
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Crusader Tunnel bottoms

  1. #1
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    Default Crusader Tunnel bottoms

    Anyone one board have any experience with the bottom of the Crusader Tunnel? My Wife and I recently picked up a '79, and with the boat upside down, if you put a straightedge on the center sponson there seems to be an inch plus of rocker built into the bottom from the front of the intake to the transom. Simply put, the straightedge will be touching the hull in front of the intake, but at the transom it will be over an inch off the hull. Seems to be factory-original too, as the gelcoat between the rear of the intake cutout and the transom is undisturbed. Some genius did grind this V-shaped flat spot into the 18" in front of the intake.

    And the grind marks visible in this next pic lined up with the flat spot, but the flat area not withstanding, there seemed to be tons of rocker from the front of the intake back.
    Last edited by 75 TX; 01-25-2011 at 09:23 AM.

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    Here's a pic of what I'm rambling about.

    I've already built up and fixed the flat spot and the rocker. I didn't bother building up the area directly behind the intake, as it's gonna get cut out to set the new intake all the way back.
    Last edited by 75 TX; 01-25-2011 at 09:25 AM.

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    Senior Member zacho!'s Avatar
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    How much material has been removed for the rideplate, looks awful deep...
    From the pic it looks like the tunnel corner is parallel to the straight edge
    Last edited by zacho!; 01-22-2011 at 03:44 PM.

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    Quote Originally Posted by zacho! View Post
    How much material has been removed for the rideplate, looks awful deep...
    From the pic it looks like the tunnel corner is parallel to the straight edge
    There wasn't any grinding done to fit the rideplate. The area directly behind the intake (and below the straightedge) is the hull, unmolested. The doodoo brown gelcoat is undisturbed. The areas to the left and right of the intake (at the transom) illustrate just how much I had to build up to make a smooth transition from just ahead of the intake to the transom.

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    Senior Member zacho!'s Avatar
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    Wow, I didn't realize how much work you had done...

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    Quote Originally Posted by zacho! View Post
    Wow, I didn't realize how much work you had done...
    Yeah, the bottom's just about done. I know it's right, as I have tremendous faith in the guy that's been advising me. I'm just hoping to hear from folks that have been around (or better yet, worked on) these boats to hear about what they've done to 'em and how it worked out.
    More pics. The 1st is at the front of the intake. At this point the hull is about 7/16" thick.

    Now at the rear of the intake, after I've built it up with glass and epoxy to provide a smooth, flat transition. A little more than 7/8" thick.

    Last pic shows the area just behind the intake, between the areas I've built up, still in what I believe to be factory original condition.
    Last edited by 75 TX; 01-25-2011 at 09:29 AM.

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    Default Crusader

    When Stan first built this hull the delta bottom was still the style of bottom that some of the tunnels were running. This boat was a vee bottom that Stan built inserts for and wella out came the tunnel. If you were to take the angle of the delta and follow it to the transom you would see what his idea was. But as things progressed it ended up with what you had before you modified the bottom. With the botttom you had they would put so much up nozzle in the boat to get it to ride way back on the boat. Not sure when it happened but Jeff Bennett and myself did change a number of these bottoms to what you are doing now and I can assure you , you are on the right track. This boat will work quite well with the mods you are making. The intake area has to be changed to match the mods you are making to the keel or the intake will set way to high in the boat.

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    B1 Racing cs19's Avatar
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    Im with Greg, Looks like your on the right track to me. Rocker is not the way to go on a tunnel boat.

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    Senior Member Futs's Avatar
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    Looks good to me, but before you get carried away and finish up the bottom, i would set the intake and then flip it back over and finish the bottom. Once you torque down the intake, it will deform the bottom.

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    Quote Originally Posted by Futs View Post
    Looks good to me, but before you get carried away and finish up the bottom, i would set the intake and then flip it back over and finish the bottom. Once you torque down the intake, it will deform the bottom.
    .
    Yeah, I know. I got a little carried away trying to get it as perfect as I could. Never done any bottom work before. Once the intake gets set if the bottom gets tweaked I'll fix it no problem

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    Positive Vibration Dread Pirate of Humboldt's Avatar
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    Default Intake placement

    I have a Crusader tunnel and have been researching and talking to people about setups for a while now. The one thing everyone has said to me is "do not move the intake all the way back. Keep the cleanout hole in center of the transom." Bostic got into detail on this with me and how well the boat shuts down with it where it's at. He's running in the 7's, so I tend to believe what he's saying. Crusader Kid also stressed this as well as a few others running these hulls. I have not talked to anyone that has moved it back or heard of anything positive about it. Not saying it can't be done or trying to look like an expert, cause I'm not, just passing on what I have been told. Most people notch the transom for the popoff if you're going to run one. Good luck with the build and I look forward to seeing the progress as mine is still a bare hull waiting for me to get after it.

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    Quote Originally Posted by Dread Pirate of Humboldt View Post
    I have a Crusader tunnel and have been researching and talking to people about setups for a while now. The one thing everyone has said to me is "do not move the intake all the way back. Keep the cleanout hole in center of the transom." Bostic got into detail on this with me and how well the boat shuts down with it where it's at. He's running in the 7's, so I tend to believe what he's saying. Crusader Kid also stressed this as well as a few others running these hulls. I have not talked to anyone that has moved it back or heard of anything positive about it. Not saying it can't be done or trying to look like an expert, cause I'm not, just passing on what I have been told. Most people notch the transom for the popoff if you're going to run one. Good luck with the build and I look forward to seeing the progress as mine is still a bare hull waiting for me to get after it.
    Thanks for the reply! I've heard of Bostick, never met him though. I imagine he had to do the same bottom work to get anywhere near 7's.
    What year is yours? Does it have the same semi-retarded bottom as my '79? Gonna do the same mods to it?
    And what was the reasoning given for not setting the intake all the way back? Based on the advice I've received from the guy who's gonna setup my pump and intake I'm settin' it all the way back. Biting edge of the shoe will be at or near the transom.
    Last edited by 75 TX; 01-23-2011 at 11:53 AM.

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    Positive Vibration Dread Pirate of Humboldt's Avatar
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    Mine is a `78. Bottom is untouched from the factory. Light layup. I mean real light! Maybe 450#. The deck is a friggin potato chip! I have the original order forms and all the paperwork from Crusader Boats. Hull was over $17k in 1978! My plans are to run it into the 8's and compete in the 9 second class. With the Daytona running right now it's going to be a year or two before I get the Crusader done though.

    Not sure Bostic did to the bottom if much , but his is lighter than mine and he's running a big cube alky motor in it. Here are a few pics I have snatched over the years. As for why not to set it back? My guess would be balance and shutdown. These things go real straight when you drop the throttle as they are and can run as hard as anything else without too much bow lift. Hanging the pump further back will change things up. I thought about doing the same thing, but was talked out of it. Greg or someone who has seen these setup through the years would have a better idea of what's going on. Or pm Bostic. " Sixohnine " He's a cool guy and very helpful.

    Bostic's is the yellow boat.
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    Last edited by Dread Pirate of Humboldt; 01-23-2011 at 10:52 AM.

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    Default Set BACK

    When you move the intake back you will have the back of the shoe even with the transom.The Crusader has an angled transom so if it was a straight transom it would have the hand hole cover in a positon to install a pop off, being that you have an angled transom you will have to knotch the transom to install a pop off. DO NOT MOVE IT BACK SO THE HAND HOLE CLEARS THE TRANSOM!

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