RB 14 with jet drive build.

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coryd
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RB 14 with jet drive build.

Post by coryd » Wed Feb 01, 2012 11:57 am

Just started a build on an RB 14. Wanted to get some opinions on some of my mods. first as the title states it will be powered by a Yamaha 650 jetski engine and pump. The pump is its own unit and not part of the hull like alot of the others and it has reverse. I am changing the transom to angle forward about 5 deg and curving it to give it that authentic inboard runabout look. and finaly I want to build it as a center console so it will look like a mini Hinkley. The primary use for the boat is as an auxiliary to ge back and forth between my big boat on the dock and my small boat on a mooring line in the same harbor. I know that i will need to beef up the glass schedual a bit and I have already gone 1/8 thicker on the frames. Feel free to shoot some comments and sugestions. thanks.



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jacquesmm
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Re: RB 14 with jet drive build.

Post by jacquesmm » Wed Feb 01, 2012 12:48 pm

The frames do not need any reinforcement but the bottom does.
You are going to "pull and push the boat with the bottom".
Put a doubler where the jet drive will go and double the glass in that area.
All that with a good safety margin, like 12" minimum all around the bolting plate.
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coryd
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Re: RB 14 with jet drive build.

Post by coryd » Wed Feb 01, 2012 12:58 pm

By doubler do mean laminating an extra layer of ply from the inside hull bottom and if so can that go between the stringers and frames or do I have to trim those down to fit over the extra ply?

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Re: RB 14 with jet drive build.

Post by jacquesmm » Wed Feb 01, 2012 2:00 pm

An extra layer first them install notched stringers over it.
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coryd
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Re: RB 14 with jet drive build.

Post by coryd » Wed Feb 01, 2012 2:20 pm

Thanks I will amend my notes. I was also assuming that i would not be needing the transome thickness that is on the plans and have set it up for only a 1/2 inch thick transome. In cc configuration I will need to raise the deck to allow 8" to clear the pump housing, will this be enough to change over to self a bailing cockpit?

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Re: RB 14 with jet drive build.

Post by jacquesmm » Wed Feb 01, 2012 2:36 pm

Correct for the transom.

Raising the whole deck will affect the stability of the boat.

We did build Phantom 16 with a jet and raised only the aft deck.
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coryd
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Re: RB 14 with jet drive build.

Post by coryd » Wed Feb 01, 2012 3:23 pm

My hope was that by puting all the mechanicals so low in the hull and omiting the topsides for the center console configuration that they would cancel that out.

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Re: RB 14 with jet drive build.

Post by jacquesmm » Wed Feb 01, 2012 3:48 pm

It does, a little bit but you raise the sole, the seats, the weight of the crew and that's most of the weights in a small boat.
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coryd
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Re: RB 14 with jet drive build.

Post by coryd » Wed Feb 01, 2012 4:07 pm

sounds like I will be doing a tunnel over the housing then. thanks

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Re: RB 14 with jet drive build.

Post by coryd » Mon Feb 06, 2012 3:05 am

Just got finished with a long weekend of building and managed get to an assembled hull. Doing a mock up out of luan really helped me figure out a lot of the little trouble spots before cutting the real wood. I took lots of pictures of each step and even a few very helpful tips that made the build go smoothly. I will post them with some commentary just as soon as I figure out how.

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