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msm8281
MMT Elite Member
Joined: Fri Oct 09, 2009 1:50 pm Posts: 9673 Location: New Iberia, La.
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Tunnel hull ideas
Looking for someone with tunnel hull experience. The guy building it has built a few with good success. I’m just looking for any pointers or opinions to make it better.
I’m getting a 20x60 tunnel with a 150 etec.
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Sat Jun 09, 2018 2:09 pm |
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Mallards Only
MMT Pro Member
Joined: Wed Jan 14, 2009 9:23 pm Posts: 404 Location: Idaho
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Re: Tunnel hull ideas
Building a tunnel is not as simple as cutting and building a "notch" in your hull. Hopefully, the guy doing yours has enough experience and know-how to get the dimensions and physics right. Do some research on venting the tunnel. When I was researching tunnels several years ago, I read a lot of stuff on that and it might be a good idea on a larger boat/motor like yours. https://www.microskiff.com/threads/tunn ... ted.28437/
_________________ 1860 Prodigy
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Sun Jun 10, 2018 7:25 am |
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msm8281
MMT Elite Member
Joined: Fri Oct 09, 2009 1:50 pm Posts: 9673 Location: New Iberia, La.
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Re: Tunnel hull ideas
Thanks.. it will definitely be a vented tunnel. I read through that thread and didn’t really learn anything. Is there any other place you found any good info?
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Sun Jun 10, 2018 9:01 am |
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Mallards Only
MMT Pro Member
Joined: Wed Jan 14, 2009 9:23 pm Posts: 404 Location: Idaho
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Re: Tunnel hull ideas
_________________ 1860 Prodigy
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Mon Jun 11, 2018 7:04 am |
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CypressCritter
MMT F.E.
Joined: Tue Aug 26, 2014 10:36 am Posts: 822 Location: Jefferson TX
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Re: Tunnel hull ideas
Tunnel only purpose is to let an outboard run 2-3 inches shallower when on plane. And to really take advantage of that is to have a hydraulic jack plate. On most boats if it is a fixed jack plate it will tend to cavitate when taking off. The expense IMO compared to performance and/or usefulness is a flip of the coin. You can also jump up on plane quicker (without tunnel) if you have a passenger go to the bow. and/or cut a little circle when accelerating. A 4 blade prop helps a lot also.
_________________ SEAARK FX 2472 CC Merc 150HP 4Stroke(CypressCadillac) Uncle J Custom - 19x54 CC Skiff w/40XD GTR
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Mon Jun 11, 2018 7:56 am |
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msm8281
MMT Elite Member
Joined: Fri Oct 09, 2009 1:50 pm Posts: 9673 Location: New Iberia, La.
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Re: Tunnel hull ideas
Yea I got all that. I will have a jackplate and electric trim tabs which will all add to shallow water take off.
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Mon Jun 11, 2018 9:14 am |
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WestEndAngler
MMT Moderator
Joined: Thu Mar 05, 2009 9:11 am Posts: 9143 Location: Houston | Surfside
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Re: Tunnel hull ideas
PM TXSHOCKWAVE on here. He just built one. I'll be having him build me one too in a year once he is off turn arounds
_________________ GTB 1860 w/ 2019 GTR40XD-HO
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Mon Jun 11, 2018 11:39 am |
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msm8281
MMT Elite Member
Joined: Fri Oct 09, 2009 1:50 pm Posts: 9673 Location: New Iberia, La.
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Re: Tunnel hull ideas
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Mon Jun 11, 2018 3:59 pm |
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msm8281
MMT Elite Member
Joined: Fri Oct 09, 2009 1:50 pm Posts: 9673 Location: New Iberia, La.
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Re: Tunnel hull ideas
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Mon Jun 11, 2018 4:16 pm |
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Quack N Stack
MMT 1000 Club
Joined: Sat Dec 15, 2012 9:43 pm Posts: 2225 Location: Baytown, Tejas
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Re: Tunnel hull ideas
If your looking for a shallow water set up, I would look into finding a Yamaha 150 TRP over the etec. It’s not gonna give you any better performance on top but it’s crazy how shallow they will get up in. I been in a 22’ majek many times and plained out in situations many boats would have been stuck in.
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Tue Jun 12, 2018 7:29 am |
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msm8281
MMT Elite Member
Joined: Fri Oct 09, 2009 1:50 pm Posts: 9673 Location: New Iberia, La.
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Re: Tunnel hull ideas
I’m buying a new engine, so the yahama trp 150 is out of the question. The reason behind the etec is bc it’s 60# lighter than yahama F150. The 135 etec is supposed to be putting out 148hp from what I read. It has a shallow water pick up on the nose cone of the LU and has a better hole shot than any other comparable 4stroke. I know the dealer so that was a big plus in going with that engine.
I’m more looking for size and dimensions of the tunnel and the vent system, but any and all comments will be accepted.
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Tue Jun 12, 2018 8:31 am |
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WestEndAngler
MMT Moderator
Joined: Thu Mar 05, 2009 9:11 am Posts: 9143 Location: Houston | Surfside
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Re: Tunnel hull ideas
_________________ GTB 1860 w/ 2019 GTR40XD-HO
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Tue Jun 12, 2018 12:51 pm |
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Cubman
MMT Pro Member
Joined: Sun May 16, 2010 8:53 pm Posts: 254 Location: East TN
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Re: Tunnel hull ideas
The Refuge Forums and 2 Cool Fishing are the best sources of info for prop tunnels.
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Sat Jun 16, 2018 12:45 pm |
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TXSHOCKWAVE
MMT Pro Member
Joined: Tue Jan 13, 2009 5:51 pm Posts: 295 Location: Karankawa Lake TX
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Re: Tunnel hull ideas
Here are some things I will tell you is don't build the tunnel wider in the front and taper to back that will make your boat slow. As for dimensions you need to size the tunnel to the prop and lower unit. The rise over run should be 1" on 12".
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Mon Jun 18, 2018 7:29 am |
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Mallards Only
MMT Pro Member
Joined: Wed Jan 14, 2009 9:23 pm Posts: 404 Location: Idaho
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Re: Tunnel hull ideas
_________________ 1860 Prodigy
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Tue Jun 19, 2018 7:15 am |
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TXSHOCKWAVE
MMT Pro Member
Joined: Tue Jan 13, 2009 5:51 pm Posts: 295 Location: Karankawa Lake TX
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Re: Tunnel hull ideas
Yes
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Tue Jun 19, 2018 5:56 pm |
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msm8281
MMT Elite Member
Joined: Fri Oct 09, 2009 1:50 pm Posts: 9673 Location: New Iberia, La.
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Re: Tunnel hull ideas
Yes had got that that far already thanks though. I going with a round vented tunnel. I found someone local with a lot of experience that is helping me. I’m just trying to get as many opinions as possible.
How far back is the motor off the boat? I’m talking about the setback of the hydro jack plate.
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Tue Jun 19, 2018 7:56 pm |
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