New Builder - Questions about plans and changes to inboard

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gustavocosta
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Re: New Builder - Questions about plans and changes to inboard

Post by gustavocosta » Wed May 15, 2019 2:23 pm

Thank you all for all the replys.

I still don't know what to build, but will be some plan listed above.

I read a topic about NV23 with onboard engine (viewtopic.php?f=8&t=60001&p=359912&hilit=NV23#p359912), Jacques said it was possible. What changes do I need to make? Increase the size of the keel? I would use a straight shaft.

For low power outboard engine (40HP) what the desing is best efficient (PG25,OP21,OB21,NV23)?


Thank you.



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jacquesmm
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Re: New Builder - Questions about plans and changes to inboard

Post by jacquesmm » Wed May 15, 2019 4:20 pm

To install an inboard is complicated when done right. You need a keel, shaft log and strut. You must set the prop location in function of the type of prop, engine rpm, add a clearance then see if the engine can be installed at that angle with still some access to the oil plug. That is a lot to consider.

For your 40 HP, the PG25 would be a good choice.
Jacques Mertens - Designer
http://bateau.com

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icelikkilinc
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Re: New Builder - Questions about plans and changes to inboard

Post by icelikkilinc » Thu May 16, 2019 8:11 am

In my humble experience, I would look for a boat that is designed to be inboard.
The design concept is based on number of factors and when you take the propulsion out replace with a different dynamic, that is a new design and not proven. I would not personally take that risk but that is your choice.

Did you look at ST21?

https://bateau.com/studyplans/ST21_study.php?prod=ST21.

It asks for 21HP inboard on the boat length that you are after.
There is an excellent example being built by Michael on the land down under.
Ilker

TW28 launch: viewtopic.php?f=12&t=23369

gustavocosta
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Re: New Builder - Questions about plans and changes to inboard

Post by gustavocosta » Fri May 17, 2019 9:20 am

I really liked the ST21, but it looks small for my family, maybe it would be possible to stretch to 23 'would be great. I would also like a stern straight for i can build a swimming platform.

I'm still thinking...

Thank you.

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jacquesmm
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Re: New Builder - Questions about plans and changes to inboard

Post by jacquesmm » Fri May 17, 2019 12:37 pm

The ST21 is not very easy to build but that's the price to pay for the unusual shallow draft.
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