Hard dinks, nesting dinks, and why we like them

Grizz

Beats the crap out of me
583
309
Northport, NY
There were quite alot of dinghys produced this way in GB, among them the dinghys for the atalanta yachts (that also are hot molded)

https://atalantaowners.org/fairey-marine-tenders/

I think several of the more sport oriented Uffa Fox dinghys were also done this way. Certainly makes for a light dinghy.
Speaking of hot-molded Uffa Fox dinghys, I remember this old newsreel making the rounds a few years ago. Pretty cool.




 
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Leeroy Jenkins

Super Anarchist
1,701
691
Vancouver
What if someone had plans for a really cool dinghy like the Hydrolite above but they wanted a longer version;  what would be the drawbacks to adding say 1 1/2 - 2" between stations?  I get that the beam to length ratio won't be the same and therefore it will look different, but I'm curious.  How hard is it to 'stretch' a design?  Is this how the longer of the two Nutshells was born?   

 

cyclone

Super Anarchist
1,491
732
Maine
What if someone had plans for a really cool dinghy like the Hydrolite above but they wanted a longer version;  what would be the drawbacks to adding say 1 1/2 - 2" between stations?  I get that the beam to length ratio won't be the same and therefore it will look different, but I'm curious.  How hard is it to 'stretch' a design?  Is this how the longer of the two Nutshells was born?   
If you’re interested look up John Marples’ Gull dinghy. It was featured in an old WoodenBoat article “Bagging the Gull” which was an introduction to the Constant Camber build method. It is a frameless 11’ design.

 

slug zitski

Super Anarchist
7,094
1,467
worldwide
Has anyone ever built or seen in real life one of the Frank Pelin Aquarius Nomad dinghys, either the 10' or 12' ? I feel like the 10' could make a hard tender for a 40-ish foot sailboat. For someone who wants a planing dinghy but not an inflatable.

https://pelinplans.co.nz/boat-plans/dinghies

 
Never seen one 

I noticed that they have plans for a pram

prams, blunt bow craft ,   make great  rowing  yacht tenders 

when made  of plywood they are light , cheap and Long lasting 

 
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MFH125

Member
164
166
What if someone had plans for a really cool dinghy like the Hydrolite above but they wanted a longer version;  what would be the drawbacks to adding say 1 1/2 - 2" between stations?  I get that the beam to length ratio won't be the same and therefore it will look different, but I'm curious
Speaking extremely generally, probably no harm and possibly some improvement.  Most dinghy's would be improved by more length.  They're short and wide because keeping them compact is such a priority.  Adding length, if you can afford it, will probably do the design no harm.

Building different length boats with the same station moulds is an old tradition.  There can be some gotchas, especially around the stem profile if it isn't lengthened as well, but the longer boats are usually easier to plank.

 

Rasputin22

Rasputin22
14,100
3,641
I just told my wife, "no new boat projects this winter."  Trying to stash my cash for a 38' cruiser.

Um, Rasp, I don't know how this works with cut files.  I have a local source for Okoume but they charge so much that it ends up being cheaper to have it shipped from CLC.  Can I get some place (like CLC) to cut ply to your files and ship it here or do I have to find a local place that will do it and schlep them five sheets of ply?

Do you have a BOM for this or at least a layup schedule you recommend? Is it in fact five sheets of 6mm Okoume?  (I am guessing)

Is the transom in the wireframes cut for a short shaft?
Sorry to be so long in answering you 2. Shortly after you posted your inquiry, I had to drive over to the Mississippi coast for the day and visited a guy who had seen this thread and said that he had a new big CNC machine and could work with me on kitting the Split-V dink. He says he has a reasonably priced source of marine ply in New Orleans so I stopped in to meet the guy and his partner and see the almost new CNC machine he had bought for a pittance on Ebay. I'll keep you posted on what we come up with and hope to have a good winter project kit soon! 

 
Rowed out the one of our barrier islands for a low key hammock camp last weekend. Pre-paint on the dinghy. 

The design is Joe Dolber's pepita. Drawn for a cruising world competition I believe. I got the drawings from duckworks last year and redrew them in cad. Laser cut the parts this summer and just finished getting it all put together. Probably one more sanding session then into the cabinet to see what colors of left over 2 part paint I've got.

565109001_PXL_20211213_1353396462(1).jpg

 

rustylaru

Member
400
138
earth
I need some advice.

I recently purchased a j32. It has davits. I have never used davits. I have a PT11 skiff. I am blessed. Tacoma to Prince Rupert return is my goal this summer.

I expect to tow the PT 11 mostly this summer because that one of the reason for having a hard dingy. But should I choose to swing it on the davits would I use slings under it attach lifting eyes to the boat.

The PT 11 has a 3/4" hole in the breast hook in the bow and 2 in the inwhale at the stern. Is a 3 point lift stable enough? If the davits are 6' wide and troughs points are 11" apart will that cause huge tension? I simple have no experience with davits so I don't know what folly would be.

The 2 boats are in different States at this time so I am advance planning.

 

Fah Kiew Tu

Curmudgeon, First Rank
10,419
3,502
Tasmania, Australia
I need some advice.

I recently purchased a j32. It has davits. I have never used davits. I have a PT11 skiff. I am blessed. Tacoma to Prince Rupert return is my goal this summer.

I expect to tow the PT 11 mostly this summer because that one of the reason for having a hard dingy. But should I choose to swing it on the davits would I use slings under it attach lifting eyes to the boat.

The PT 11 has a 3/4" hole in the breast hook in the bow and 2 in the inwhale at the stern. Is a 3 point lift stable enough? If the davits are 6' wide and troughs points are 11" apart will that cause huge tension? I simple have no experience with davits so I don't know what folly would be.

The 2 boats are in different States at this time so I am advance planning.
I use 3 point lifts in my tenders. Usually a single eye on centreline forward and a pair of Wichard type folding eyes at or close to the chine or gunwhales aft.

I have 3 dinghies I use as tenders depending on what I feel like.

3 point lifts are plenty stable enough IMO.

I make sure that the lift points coincide with the span between davits so the falls are vertical. I don't worry about weight balance though, usually leave the o/b on the tender because I'm far too lazy to take it off.

I also add hard points to the tender hulls if I think it necessary.

The 'new' big tender is 2.9m long, the davit spacing is 1.575m and the transom width is about the same, give or take. All the dinghies stick out some. If you never go alongside it's never a problem.

FKT

FKT

 

Elegua

Generalissimo
I need some advice.

I recently purchased a j32. It has davits. I have never used davits. I have a PT11 skiff. I am blessed. Tacoma to Prince Rupert return is my goal this summer.

I expect to tow the PT 11 mostly this summer because that one of the reason for having a hard dingy. But should I choose to swing it on the davits would I use slings under it attach lifting eyes to the boat.

The PT 11 has a 3/4" hole in the breast hook in the bow and 2 in the inwhale at the stern. Is a 3 point lift stable enough? If the davits are 6' wide and troughs points are 11" apart will that cause huge tension? I simple have no experience with davits so I don't know what folly would be.

The 2 boats are in different States at this time so I am advance planning.
That's what I do with mine - but just to lift it out. 

 

ProaSailor

dreaming my life away...
6,123
809
Oregon
If the davits are 6' wide and troughs points are 11" apart will that cause huge tension?
I assume you mean 11 feet apart?  So 2.5 feet overhang on each end?  Yes, that could be a problem.  You could suspend an 11 foot long pole from the davits, then hang the dinghy on the pole?

How about this?

Hanging the PT Spear on Davits
http://ptwatercraft.com/blog/?p=1845

wells-swallow-on-davits.jpg

IMG_4845.jpg

 
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mckenzie.keith

Aspiring Anarchist
858
286
Santa Cruz
I need some advice.

I recently purchased a j32. It has davits. I have never used davits. I have a PT11 skiff. I am blessed. Tacoma to Prince Rupert return is my goal this summer.

I expect to tow the PT 11 mostly this summer because that one of the reason for having a hard dingy. But should I choose to swing it on the davits would I use slings under it attach lifting eyes to the boat.

The PT 11 has a 3/4" hole in the breast hook in the bow and 2 in the inwhale at the stern. Is a 3 point lift stable enough? If the davits are 6' wide and troughs points are 11" apart will that cause huge tension? I simple have no experience with davits so I don't know what folly would be.

The 2 boats are in different States at this time so I am advance planning.
Seems like a J32 is a bit small to carry an 11 foot dinghy on davits. Of course it depends on the conditions.

 

rustylaru

Member
400
138
earth
Seems like a J32 is a bit small to carry an 11 foot dinghy on davits. Of course it depends on the conditions.
Yes, I suspect I will mostly lift the dingy up at night so it doesn't bonk against the hull at anchor.

The j32 came with them. My first reaction was to just remove them. But I'll try them for a summer.

 

Zonker

Super Anarchist
10,177
6,371
Canada
Why a spreader? I've never seen that done for a dinghy.

The inward compression forces using 2 lifting points to the gunwhales or the transom or a seat frame for lifting a PT11 dinghy are minimal. Simply doesn't weigh enough to matter.

 

ProaSailor

dreaming my life away...
6,123
809
Oregon
Why a spreader? I've never seen that done for a dinghy.

The inward compression forces using 2 lifting points to the gunwhales or the transom or a seat frame for lifting a PT11 dinghy are minimal. Simply doesn't weigh enough to matter.
That depends on what's in it (full of water being the worst case) and the "angle of the dangle".  Let's see the math?

 

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