Dingy plans

[Lovako]

Anyone out there with easy to build Dingy plans?

[Andy Nemier]

Watching this one too!  Anyone?

[Jeff]

I have been wanting to build one of JB Watercraft Designs for some time.  They look easy and the cost of plans is reasonable.

The Unicat designs are intriguing. 

https://www.jbwatercraft.com/

[Ganz Daniel]

Hello, I build my dinghy in stich and glue as tender to our Tiki 38. Unfortunately I lost the plans..

Here a  link:  https://intheboatshed.net/free-boat-plans-at-intheboatshednet/

We still use this tender, but keep in mind that a rubber dinghy has a much bigger stability per example to get in an out ouf the dinghy from the water. You can not just jump in the dinghy when you use it as tender for a bigger boat, you need to be careful when when  there are more then one person to board the boat.

Cheers

Daniel

[NeilR]

Here is a free one worth a look. In google, search ...  dinghy "tender fritz" plans

The full plan  is a pdf download from the first result.

Also check out John Welsford's many small boat designs. https://jwboatdesigns.co.nz/wooden-boat-plans/

Hope it helps

[Lovako]

Thanks for all the input, much appreciated.

Maybe a dumb question - can one increase existing measurements say by 10% or 200mm to make a dingy bigger?

Or how do i do it - say length of 2.2 stretch to 2.8 and width of 1.1m to 1.4m ???

Thanks for the input

[NeilR]

Hmmm. I don't think it's a dumb question but it IS something that would require analysis of the design to ensure there are no unintended consequences. Stability for example.

If you don't get an answer here then try asking on boatdesign.net. 

[Lovako]

Answer I got back from Boatdesign.net for those interested.

The simple alteration is length, all you have to do is increase the station spacing a bit to achieve the length you are aiming for. You can use existing station moulds. To make the dinghy wider as well is a bit more difficult as you need to make new station moulds or use a 3D CAD program that will allow for differing scale factors in all 3 directions and then you need to offset the resulting shape by the plank thickness to determine the shape of the new station moulds, at the locations where the new length would locate them. For a dinghy that is known to work, there is a fair chance of a useful boat but for anything larger it ought to be run through the usual calculations to check for nasty surprises and to establish the location of the revised waterline.

[NeilR]

Looks like sound advice. Now you have a way forward. Good luck 

Lovako said:

Answer I got back from Boatdesign.net for those interested.

The simple alteration is length, all you have to do is increase the station spacing a bit to achieve the length you are aiming for. You can use existing station moulds. To make the dinghy wider as well is a bit more difficult as you need to make new station moulds or use a 3D CAD program that will allow for differing scale factors in all 3 directions and then you need to offset the resulting shape by the plank thickness to determine the shape of the new station moulds, at the locations where the new length would locate them. For a dinghy that is known to work, there is a fair chance of a useful boat but for anything larger it ought to be run through the usual calculations to check for nasty surprises and to establish the location of the revised waterline.

[Lovako]

More info recieved:

You have proposed changing length from 2.2 to 2.8 which is more than 10% in fact that is 27% Changing the width from 1.1 to 1.4 is much more than 10%. It may not be advisable to change both dimensions by that much.

When you mention the width dimension, are you measuring the width of the bottom or the width of the gunwales (sheer width at the widest point) ? Typical dimensions for the bottom width of a ( nine foot) 2.8 meter dinghy might be somewhere from (36 to 45 inches) or 0.9 to 1,14 m. The 1.14 bottom width would make the dink have more initial stability but it would also make it more difficult to row or paddle. The more narrow bottom would be less stable but still entirely usable. It would be a little more tender but not dangerously so for a reasonable user.

Please tell us how you intend to use the little boat. We will then be able to give you more detailed advice. Post a picture or a section drawing if you can. Also tell us the probable weight of the users and the weight of the gear that you will also carry. Is this to be a row or sailing boat or a power boat? If you want it to be a fast power boat, the whole set of numbers will need to be considered.

[NeilR]

It's looking like a challenge. That's ok of course if that's what you're looking for but if you just want to build the dinghy then maybe expand your search? Here are two more links ive dug out of my archive which might assist your search.

https://www.wavedancer-yachtdesign.com/html/Intro.html

https://whisstock.com/page_02.php?page_id=2.1.3&design=073

[Lovako]

Thanks - will keep on looking.

Im greatful for all the help but your'e right it's become complicated.

All i want is to build a simple dingy/annexe of 2.8m x 1.2 - 1.4m wide.

It's just to cart provisions to and from my Pahi 42.

Any free plans out there?