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Author Topic:   tunnel for 13
JimU posted 06-04-2002 02:40 PM ET (US)   Profile for JimU   Send Email to JimU  
I have a 13 sport with 3 cyl 40 Yam. thinking about having an outfit in Texas install a tunnel for shallow water running. Any experience with such a modification? Comments? Recommendations? thanks. JIM
newboater posted 06-04-2002 05:00 PM ET (US)     Profile for newboater  Send Email to newboater     

It sounds like an effective way to ruin a perfectly good Whaler.

There is a saying about teaching a pig to sing. You only make an ass of yourself and you annoy the pig.

It seems there are probably lots of boats that were designed to perform well in shallow water. By hacking up a Whaler you lose the key elements the boat was designed for like lightweight, buoyancy, and strength. You also would loose on the resale value of the boat.

When you get all done, all you have is a hacked up boat that doesn't perform well, and you spent more money than needed to buy the right boat that was designed for shallow water.

If you don't care about strength, buoyancy, cost or resale, then start cutting, just be quiet about it. <g>

Dave S.

JohnAz posted 06-05-2002 09:31 AM ET (US)     Profile for JohnAz  Send Email to JohnAz     
Dont be quiet about it,,,,if you do it, let us know the results,,ignorance is bliss
jimh posted 06-05-2002 10:26 AM ET (US)     Profile for jimh  Send Email to jimh     
You might want to read my article abou the development of the original hull design.

The boat once had a tunnel but it was removed for a reason.

JimU posted 06-05-2002 12:34 PM ET (US)     Profile for JimU  Send Email to JimU     
Thanks for the comments. maybe if I had a 13 project boat I'd be more motivated to chop it up.
JimU posted 06-05-2002 01:17 PM ET (US)     Profile for JimU  Send Email to JimU     
to jimh. I have read your article about the original whaler.In the presenntn thread you said the boat originally had a tunnel but it was removed. In reading your article I don't see specificr eference to a tunnel, but rather to a "middle cavity in the hull that forced air into the water as it rushed into the propeller, . . . leading to partial cavitation ...". We have a number of capable local boat builders who see to have solved this problem for aluminum tunnel hulls. The trick is to install a vent at the top of the tunnel. The vent is is a half section of two inch aluminum pipe welded to the top of the tunnel and extending the length of the tunnel. It allows trapped air to rise above the tunnel of water and exit. the cavitation problem is further mitigated by using a performance prop with some cup added to the blades. Engine is mounted high using a jack plate. In fact running along side you can see the tips of the prop running above the water.You neither hear nor feel any cavitation effects and performance (speed does not appear to be affected). I owned one of thse rigs, an 18 by 3 foot aluminum skiff powered by a 25 yam. Bought it from a from a cajun aligator hunter,. but I happened to know the fellow who had installed the tunnel. the builder has a local reputation for building and modifying aluminum hulls for shallow water runnning. My rig would run in less than a foot of water. I sold it an bought the 13 whaler and was thinking... Cheers JIM
vdbgroup posted 06-09-2002 01:05 AM ET (US)     Profile for vdbgroup  Send Email to vdbgroup     
Trans Fiberglass Boats in Palacios, TX has put pocket tunnels in both 15', Montauks, and 18' OUtrage.

I have not personally tested these modifications. The purpose of the tunnel is to allow jacking the motor up to avoid bottom at shallow depths. There is no change in draft of the hulls.

I have to believe that no matter how good the glass work, that there is not some compromise to hull integrity and to design performance.

Call T.V. Tran for details.

bsmotril posted 06-11-2002 02:39 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
The "Gulf Coast" 18 and 20 look like they are basically a Montauk hull copy with an added Tunnel. The Trans boats look like a revision of that design where the tunnel is made a wider and shallower squared off slot and the chines flattened a bit. I can't help but look at either design and think that someone started by popping a mold off a Montauk. Neither uses Whalers hull construction methods, but both have good reputations as fine skinny water fishing boats on the TX coast.
PMUCCIOLO posted 06-11-2002 02:49 PM ET (US)     Profile for PMUCCIOLO    

Perhaps you should consider the Pathfinder, a boat manufactured by the combined Hewes, Maverick, and Pathfinder boat copanies. They offer small, light fishing skiffs designed for flats fishing with tunnels. Also, if you really want to open up your wallet, the Maverick Mirage HPX Tunnel provides you with another option.

I, personally, would not modify the Whaler. Best of luck in your pursuit.


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