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Thread: New Dinghy for Amazon

  1. #1
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    Default New Dinghy for Amazon

    I’m thinking about building a new dinghy for Amazon. The skin on frame pram we are currently using is just a little too small and a little too light weight for comfort, so my goal is to see if I can come up with something a little bigger and stouter, that I can still get up on the cabin top.

    With that goal in mind, I spend the day drawing up a first draft and then mocking it up in card board.

    loa 7’ 6”, max beam 5’ 6”

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    I’m not totally convinced yet, but I think it’s a good start.
    -Jim

    Sucker for a pretty face.
    1934 27' Blanchard Cuiser ~ Amazon, Ex. Emalu
    19'6" Caledonia Yawl ~ Sparrow

    Getting into trouble one board at a time.

  2. #2
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    Default Re: New Dinghy for Amazon

    Why two flat ends? And why not just use one of the thousands of dinghy plans that have already been built and tested?

  3. #3
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    Default Re: New Dinghy for Amazon

    A slide rule? Old school designing

  4. #4
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    Default Re: New Dinghy for Amazon

    Quote Originally Posted by Mike-in-Suffolk View Post
    Why two flat ends? And why not just use one of the thousands of dinghy plans that have already been built and tested?
    Two flat ends, aka a pram, provide for way more interior volume and load carrying capacity, especially in short boats.

    Why shouldn’t I draw one up for myself? It’s fun.
    -Jim

    Sucker for a pretty face.
    1934 27' Blanchard Cuiser ~ Amazon, Ex. Emalu
    19'6" Caledonia Yawl ~ Sparrow

    Getting into trouble one board at a time.

  5. #5
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    Default Re: New Dinghy for Amazon

    Good stuff JIm. Do you reckon you’ll be able to enlarge those cardboard planks to get out your real ones?
    Did you have a think about a nesting to get a bit more length?

  6. #6
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    Default Re: New Dinghy for Amazon

    I prefer the longer bow on the Norwegian Prams, just my six pen'th.
    I would now move to Freeship, which will give you the fully developed planks as an output.
    It really is quite difficult to build an ugly wooden boat.

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  7. #7
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    Default Re: New Dinghy for Amazon

    From the shape of the top of the transom, are we to infer that you are considering hanging an outboard there?
    Alex

    "The fishermen know that the sea is dangerous and the storm terrible, but they have never found these dangers sufficient reason for remaining ashore.”
    - Vincent van Gogh

    http://www.alexzimmerman.ca

  8. #8
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    Default Re: New Dinghy for Amazon

    I like it! however I wonder if it won't seem too small as your crew inevitably gets larger? I'm sure that is something you have thought about (it's not like you can avoid noticing that the kids get taller every year) but it has had us contemplating a larger tender for Skookum Maru and our crew is rather smaller than yours. What about making a larger nesting pram instead? You could take that basic design and extend it to say 9' 6" or so and get a tender that could take the entire family in comfort and that would handle a little chop. Probably easier to launch and stow as well.

    Now that I think about it, maybe that's not a bad idea for us as well. Hmmmm.
    - Chris

    Life is short. Go boating now!

  9. #9
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    Default Re: New Dinghy for Amazon

    While I'm not suggesting you buy one, a couple of examples on the size topic: I have a 9' Dyer Dhow with a 2HP outboard. I have transported 4 adults with their gear along with a week's groceries & beer for 5 with no problem. A friend has a Dyer Dink (aka Midget) - much the same boat except 7'11" & a daggerboard instead of bronze centerboard. It won't carry quite as much, but will do 4 adults or 3 + gear & groceries.

    The Dhow has amazing stability. I (185 lbs) can step on the outer edge of the center seat when the dinghy is empty & it'll have 4" of freeboard on that side. Haven't tried that test on the Dink/Midget.

    My folks had an 8' pram that could match the Midget load-wise. A pram does indeed get you a little more stowage space/flexibility.
    "If it ain't broke, you're not trying." - Red Green

  10. #10
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    Default Re: New Dinghy for Amazon

    How big is your design? It looks great. If you stick close to the dimensions of the larger Nutshell Pram you’ll have a winner.

  11. #11
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    Default Re: New Dinghy for Amazon

    Quote Originally Posted by Andrew Donald View Post
    Good stuff JIm. Do you reckon you’ll be able to enlarge those cardboard planks to get out your real ones?
    Did you have a think about a nesting to get a bit more length?
    I could probably use the cardboard planks to pull enough measurements to get the general shape and then refine it on the full sized boat. I’m also going to use them to make sure I know how much plywood I’m going to need. The other option would be making full sized templates on the molds, which is pretty straightforward.


    Quote Originally Posted by Peerie Maa View Post
    I prefer the longer bow on the Norwegian Prams, just my six pen'th.
    I would now move to Freeship, which will give you the fully developed planks as an output.
    I looked at that Nick, but don’t have a machine I can run Freeship on at home.

    Quote Originally Posted by AJZimm View Post
    From the shape of the top of the transom, are we to infer that you are considering hanging an outboard there?
    That’s right Alex, I have a little Suzuki 2.5 horse four stroke that I’m going to pair with it. Or that’s the idea anyway.

    Quote Originally Posted by cstevens View Post
    I like it! however I wonder if it won't seem too small as your crew inevitably gets larger? I'm sure that is something you have thought about (it's not like you can avoid noticing that the kids get taller every year) but it has had us contemplating a larger tender for Skookum Maru and our crew is rather smaller than yours. What about making a larger nesting pram instead? You could take that basic design and extend it to say 9' 6" or so and get a tender that could take the entire family in comfort and that would handle a little chop. Probably easier to launch and stow as well.

    Now that I think about it, maybe that's not a bad idea for us as well. Hmmmm.
    To be honest Chris, I never really considered a nesting dinghy. Having never seen one in real life they seem a bit awkward to deploy. I could be wrong about that but I do know that the harder something is to use the less likely it is ever be used.

    As a complete aside, I’m trying to fit this boat into a very specific place on the cabin top, which is the only real space I’ve got. Aside from just square footage, it’s 8 feet off the water. Launching at anchor works pretty well as I have worked out a system that allows me to lower the boat until the transom hits the rail and then push the bow out like lowering a draw bridge. But it needs a dock the get it back up on the roof. I really should explore the davit idea more.


    The current dinghy is good for two full-size adults, or an adult and a couple kids. I like to get that up to three full-size adults. Time to do some math and see where the current version stands.
    -Jim

    Sucker for a pretty face.
    1934 27' Blanchard Cuiser ~ Amazon, Ex. Emalu
    19'6" Caledonia Yawl ~ Sparrow

    Getting into trouble one board at a time.

  12. #12
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    Default Re: New Dinghy for Amazon

    Quote Originally Posted by Garret View Post
    While I'm not suggesting you buy one, a couple of examples on the size topic: I have a 9' Dyer Dhow with a 2HP outboard. I have transported 4 adults with their gear along with a week's groceries & beer for 5 with no problem. A friend has a Dyer Dink (aka Midget) - much the same boat except 7'11" & a daggerboard instead of bronze centerboard. It won't carry quite as much, but will do 4 adults or 3 + gear & groceries.

    The Dhow has amazing stability. I (185 lbs) can step on the outer edge of the center seat when the dinghy is empty & it'll have 4" of freeboard on that side. Haven't tried that test on the Dink/Midget.

    My folks had an 8' pram that could match the Midget load-wise. A pram does indeed get you a little more stowage space/flexibility.
    Thanks Garret, that’s very helpful.

    Quote Originally Posted by StevenBauer View Post
    How big is your design? It looks great. If you stick close to the dimensions of the larger Nutshell Pram you’ll have a winner.
    The stern transom is five feet wide and 18 inches deep. The bow transom is three and a half feet wide and 20 inches deep. At station four, so almost smack dab in the center of the boat, is the max beam of five and a half feet. From transom to transom is seven and a half feet. The bow rises six inches starting 24 inches from the bow and there is a shallow vee on the bottom all the way to the stern. The bottom panels are the largest and they can both be cut out of one sheet of plywood, just.
    -Jim

    Sucker for a pretty face.
    1934 27' Blanchard Cuiser ~ Amazon, Ex. Emalu
    19'6" Caledonia Yawl ~ Sparrow

    Getting into trouble one board at a time.

  13. #13
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    Default Re: New Dinghy for Amazon

    Hoping you are all having a great summer cruising Jim!
    I was wondering why you need a dinghy on the roof and if there reasons you can’t just tow. My Bolger car topper handled on a towline everything in wind and waves that Accolade encountered without incident for twelve years now.
    I love your design/build processes. / Jim

  14. #14
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    Default Re: New Dinghy for Amazon

    Thanks Jim, so far so good.

    with the current dinghy we will tow home once we’ve launched it, but I’m not entirely comfortable towing it. Mostly I just worry about wind picking it up.

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    -Jim

    Sucker for a pretty face.
    1934 27' Blanchard Cuiser ~ Amazon, Ex. Emalu
    19'6" Caledonia Yawl ~ Sparrow

    Getting into trouble one board at a time.

  15. #15
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    Default Re: New Dinghy for Amazon

    Plank shapes.

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    which will fit nicely on a sheet of plywood.

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    -Jim

    Sucker for a pretty face.
    1934 27' Blanchard Cuiser ~ Amazon, Ex. Emalu
    19'6" Caledonia Yawl ~ Sparrow

    Getting into trouble one board at a time.

  16. #16
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    Default Re: New Dinghy for Amazon

    Well, being impatient, I gave up on messing with the drawings and just got on with it. How hard could it be?

    Going from 2 inches equals a foot to full sized, everything is pretty much plus or minus an eighth, but a batten will find the fair line.

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    bow and stern transoms.

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    The funnest part about this is how quickly it is taking shape. No molds, just zip ties.

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    Not bad for an afternoon’s worth of work.
    -Jim

    Sucker for a pretty face.
    1934 27' Blanchard Cuiser ~ Amazon, Ex. Emalu
    19'6" Caledonia Yawl ~ Sparrow

    Getting into trouble one board at a time.

  17. #17
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    Default Re: New Dinghy for Amazon

    Wow, that’s moving right along! Looks great to me.
    - Chris

    Life is short. Go boating now!

  18. #18
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    Default Re: New Dinghy for Amazon

    Dats what I loves bout dat teknick
    looks teriffic

  19. #19
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    Default Re: New Dinghy for Amazon

    Sometimes just starting on with the process answers questions.

  20. #20
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    Default Re: New Dinghy for Amazon

    I should be much farther along, but we decided to go boat camping instead.

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    The big turned seven on Tuesday and really wanted a camping birthday. How could we say no.

    We did visit with some nice folks off of a really cool fish tender, St Lazaria, built in 1918 and still working.

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    And then I got the shear plank hung this afternoon when we got home.

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    I think that will work okay.
    -Jim

    Sucker for a pretty face.
    1934 27' Blanchard Cuiser ~ Amazon, Ex. Emalu
    19'6" Caledonia Yawl ~ Sparrow

    Getting into trouble one board at a time.

  21. #21
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    Default Re: New Dinghy for Amazon

    Unless it’s loaded to the point where the bow transom is buried, the boat should slide along pretty well, with that entry, without pounding in a chop. At the same time the broad stern and flat run aft will give it a lot of load capability.
    Looks good.
    Alex

    "The fishermen know that the sea is dangerous and the storm terrible, but they have never found these dangers sufficient reason for remaining ashore.”
    - Vincent van Gogh

    http://www.alexzimmerman.ca

  22. #22
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    Default Re: New Dinghy for Amazon

    The kids are getting big Jim. Better get the new tender done so you can haul them all around! And speaking of, I just re-read the dimensions you posted above. I hadn't really thought about it before but five feet wide at the transom? That's going to be a big boat considering that it's only an 7', 6" pram. The small Nutshell is the same length but 18" narrower. I was originally thinking that you were building your own version of a Nutshell (and why not?) but it's not going to be the same at all. I think your boat may fill a niche that other pram designs do not. I'll be interested in seeing how much it will carry.
    - Chris

    Life is short. Go boating now!

  23. #23
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    Default Re: New Dinghy for Amazon

    That’s my hope Alex, a bow that can handle a little chop with a mostly flat bottom that will be easy to push along with our small outboard.

    It is a big chunk of a little boat Chris. Our current dinghy is about the same size as a nutshell pram and it is not nearly big enough. I know I’m pushing things with the width. It could be great, just okay, or terrible. But I’m happy with the shape of it, so we’ll see.
    -Jim

    Sucker for a pretty face.
    1934 27' Blanchard Cuiser ~ Amazon, Ex. Emalu
    19'6" Caledonia Yawl ~ Sparrow

    Getting into trouble one board at a time.

  24. #24
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    Default Re: New Dinghy for Amazon

    I love it. With that beam maybe not the best rower, but with the outboard you’ll be cruising in style.

  25. #25
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    Default Re: New Dinghy for Amazon

    Dinghy Man! Hey! It's da Dinghy Man!

    Kevin
    There are two kinds of boaters: those who have run aground, and those who lie about it.

  26. #26
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    Default Re: New Dinghy for Amazon

    No, I don’t foresee winning any rowing competitions but it won’t be the worst boat I’ve ever rowed either. That award would have to go to this old flat bottomed home built wooden skiff a friend of mine had. We rowed it three miles up the inlet to get to his folks’s cabin. That sucker was heavier than sin, we had to keep switching the rowers just to keep it moving.
    -Jim

    Sucker for a pretty face.
    1934 27' Blanchard Cuiser ~ Amazon, Ex. Emalu
    19'6" Caledonia Yawl ~ Sparrow

    Getting into trouble one board at a time.

  27. #27
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    Default Re: New Dinghy for Amazon

    I got the inside seams all filleted this evening, there are plenty of fine examples of that already posted by others so I didn’t bother with a picture. But I did get a picture of it stood up on its transom which gives a little bit better perspective on its overall size.

    C24BC4C7-6DBF-451F-A2F5-76488FC90EB3.jpg

    6C679B82-6088-4C31-8F97-5FB01548DDA0.jpg

    My usual helpers were busy, so you’re stuck with my ugly mug.
    -Jim

    Sucker for a pretty face.
    1934 27' Blanchard Cuiser ~ Amazon, Ex. Emalu
    19'6" Caledonia Yawl ~ Sparrow

    Getting into trouble one board at a time.

  28. #28
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    Default Re: New Dinghy for Amazon

    -Jim

    Sucker for a pretty face.
    1934 27' Blanchard Cuiser ~ Amazon, Ex. Emalu
    19'6" Caledonia Yawl ~ Sparrow

    Getting into trouble one board at a time.

  29. #29
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    Default Re: New Dinghy for Amazon

    Now that's an Alaska-sized pram.
    - Chris

    Life is short. Go boating now!

  30. #30
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    Default Re: New Dinghy for Amazon

    E18A08D6-6C02-4B3E-8966-DAEB844722D1.jpg

    I wish I had a skiff like this when I was a kid.
    -Jim

    Sucker for a pretty face.
    1934 27' Blanchard Cuiser ~ Amazon, Ex. Emalu
    19'6" Caledonia Yawl ~ Sparrow

    Getting into trouble one board at a time.

  31. #31
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    Default Re: New Dinghy for Amazon

    Your children will love it. Who gets to name it?

  32. #32
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    Default Re: New Dinghy for Amazon

    Quote Originally Posted by jsjpd1 View Post
    E18A08D6-6C02-4B3E-8966-DAEB844722D1.jpg

    I wish I had a skiff like this when I was a kid.

    I love this shot!

  33. #33
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    Default Re: New Dinghy for Amazon

    The smile on the face says it all!

  34. #34
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    Default Re: New Dinghy for Amazon

    Seats are in and rails are almost finished. The seats ended up being extra fiddly, they’re 1/4 inch plywood with a frame underneath to keep it stiff but still light.

    98A1F065-76DC-4894-A50D-5501FA80A1A5.jpg

    I can’t wait to try it out so I think we’re going to put it in the water after the rails kick off, paint be damned.
    -Jim

    Sucker for a pretty face.
    1934 27' Blanchard Cuiser ~ Amazon, Ex. Emalu
    19'6" Caledonia Yawl ~ Sparrow

    Getting into trouble one board at a time.

  35. #35
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    Default Re: New Dinghy for Amazon

    Any idea what she weighs now?
    - Chris

    Life is short. Go boating now!

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