Making a Jet TNT

About using jet ski motors to power small boats

Moderator: Bill Edmundson

powerman777
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Location: Fremont Ohio

Making a Jet TNT

Post by powerman777 » Fri Jun 18, 2010 7:06 pm

I am new to the forum. The past 5 years I been making wood rc boats. I have a set of TNT boat plans and have a Polaris SL750 jet ski for a motor. If any one has any good pics to help me out. That WOOD be cool. I have the frames and just making the jig now... Thanks Bill

upspirate

Re: Making a Jet TNT

Post by upspirate » Fri Jun 18, 2010 7:56 pm

Welcome Bill,

The TNT has always been one of my favorites,and I always wondered what it'd be like with a jet since I saw an article on one in Mechanics Illustrated back in the late 1960's.That one used a lot smaller engine than a PWC,so the performance was less.

Glen-L reprinted that article a while back in one of their newsletters:

http://www.glen-l.com/weblettr/weblette ... illus.html

Here is an article about using a jet ski pump:

http://www.glen-l.com/weblettr/weblette ... 4.html#jet

powerman777
Posts: 29
Joined: Sun Jun 13, 2010 6:15 pm
Location: Fremont Ohio

Re: Making a Jet TNT

Post by powerman777 » Sat Jun 19, 2010 5:47 am

:D THANKS YOU! Them will help.... I do not know if the jet and the motor will be too long to fit in the boat. Mite have to make it 12" 6" long.

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steve crawford
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Re: Making a Jet TNT

Post by steve crawford » Wed Jul 07, 2010 5:00 am

The 750 is a good choice. My boat is about 12'6'' + the step plate on the back making it 13'. I modified the transom frame making it more V shaped and it works fine. I also added strakes to the hull. I also arched the deck making more leg room. Have no fear when modifying the plans to make things fit.
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powerman777
Posts: 29
Joined: Sun Jun 13, 2010 6:15 pm
Location: Fremont Ohio

Re: Making a Jet TNT

Post by powerman777 » Thu Jul 08, 2010 11:40 am

Them will help out alot. Thanks!!! I was thinking about putting on some strakes on it. It will give it some lift and speed. Steven your boat is SWEEEET! I hope mine looks that good.

powerman777
Posts: 29
Joined: Sun Jun 13, 2010 6:15 pm
Location: Fremont Ohio

Re: Making a Jet TNT

Post by powerman777 » Mon Oct 18, 2010 4:25 pm

The boat coming along... Sorry the pic is dark...
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1018101416a[2].jpg

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steve crawford
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Re: Making a Jet TNT

Post by steve crawford » Mon Oct 18, 2010 8:42 pm

See the V shape of the Jet ski hull pc. you cut out? This is why I changed my transom frame and the next frames forward to match the V more closely.
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powerman777
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Location: Fremont Ohio

Re: Making a Jet TNT

Post by powerman777 » Tue Oct 19, 2010 6:56 am

Ya! I think I'm going to have to do that. Put some side wood along the jet drive like you did too... Thanks for the help!!! :D

powerman777
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Location: Fremont Ohio

Re: Making a Jet TNT

Post by powerman777 » Tue Nov 23, 2010 2:57 pm

Have the sides on. Working on the bottom now...
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Picture 111.jpg

upspirate

Re: Making a Jet TNT

Post by upspirate » Tue Nov 23, 2010 4:26 pm

Looks good!

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steve crawford
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Location: K.C. MO.

Re: Making a Jet TNT

Post by steve crawford » Tue Nov 23, 2010 7:35 pm

powerman
I would like to se a pic. from the back of the transome. And how are you going to transition the hull to the bowed section (grafted in jet ski hull)?

powerman777
Posts: 29
Joined: Sun Jun 13, 2010 6:15 pm
Location: Fremont Ohio

Re: Making a Jet TNT

Post by powerman777 » Tue Nov 23, 2010 8:20 pm

Well the boat is in my basement. The room is 12' x 10' and the jig is on wheels. The front sticks out the door about 8". Sorry you will have to wate intill i flip it for pics of the back... I'm going to put wood in front of the jet hull. Ran out of epoxy today have to get more. Have all the plywood 1/4" marine 39 buck a sheet. Is that a good price? I wont to have the bottom done and flipped over by X-mas... Oh i'm to put a little swim plat form on the back. Something like yours Steve... Thanks for the posts....... Bill

powerman777
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Re: Making a Jet TNT

Post by powerman777 » Tue Nov 23, 2010 8:29 pm

Had to move some stuff around but hears the pics i could get...
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Picture 113.jpg

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steve crawford
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Re: Making a Jet TNT

Post by steve crawford » Thu Dec 02, 2010 4:47 pm

Be sure and epoxy the heck under that grafted in part.

I notice the pump mounts land inside the transom, did you lengthen the hull?

To attach the platform on the back I added a 3/4'' pc. of ply across the transome and flush with the bottom. And then glued and screwed the platform to the top edge. And just used gussets to suport it.
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I would bow the deck, it gives more leg room...
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And I droped the center of my forms to make a more of a V hull to blend in with the jet-ski graft.

powerman777
Posts: 29
Joined: Sun Jun 13, 2010 6:15 pm
Location: Fremont Ohio

Re: Making a Jet TNT

Post by powerman777 » Wed Dec 29, 2010 8:57 pm

This is what i have so far. going to use bondo glass to build up around the jet drive. then do a LOT of sanding to make it look like it should go thair...
Attachments
Picture 117.jpg
Picture 116.jpg

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