15 Posts
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New Moth MKII semi scale yacht
Haven't built anything for a while due to lack of space (too many models) but the urge to build something was too great. After looking at many options, I decided to go with something 'easy' to build. I found some full size plans for an Australian MkI Moth which I'm building to a MKII (double chine) style.
I'm building in foam and glass again to make things easier. It's 850mm long and 310 wide which is roughly 1/4 scale (original is 11 ft)
Started by converting all the lofting measurements on the redrawn 1953 plan to metric and dividing them by 4 to get the scale.
Next was creating the ply deck, then contact gluing onto it a piece of dense 50mm building polystyrene. This was then shaped with a surform file and the chines shaped afterwards using eyeometry. Then the 10mm deck foam was glued on so the deck sheer could be shaped.
Next the cockpit foam was routered out, and basswood sides and inner transom piece epoxied in. After that, the ply outer transom piece and hardwood nose block was epoxied on.
The centerboard case upper and lower ply braces were routered out (using the mill and a 1/2" slotting bit) large enough to accept the case sides, leaving enough room for the 6mm aluminium keel (can't use a centerboard for obvious reasons) which will have to have a bulb fitted.
A rebate in the bottom of the hull was routered out for the lower c/board brace. These braces are needed to form part of a box structure with the floor and cockpit sides which the c/board can lever on. Once everything is eventually glassed in, it will make it very strong unit, so the foam will just be the shape surrounding the box, and not having any strain put on it. The ply deck will take the strain of the stays/mast.
The cockpit floor was cut, and will be slotted the same as the braces, then the c/board case will be built.
The mast on this is 1.486m tall, - sail is -luff -11.295, foot 609mm, so quite large for a small boat. The full sized boat is a lot of fun to sail, so this model will be interesting to sail. Unfortunately, without the human input required, and being a performance boat, it may assume the attributes of a submarine in a stiff breeze, - time and testing will tell.
The basic mast was made from 12mm ally tube, boom from 10mm. Sail pattern was cut from art card to the plan. All laid out on the floor to get an idea of what it will look like.
PDF is the history of the Moth. There were a number of versions round the world as it went along,- scow, international moth (dinghy type) and todays high speed foiling moth.
Lots more to do yet
JB
2025 world champs, off the Whangaparaoa peninsula, just up from where I live.
https://www.youtube.com/watch?v=FuLhJ-yRLmc
https://australianclassicdinghynetwork.org/moth
https://www.youtube.com/watch?v=wWkd2e8apSI
https://www.moth.asn.au/
https://www.youtube.com/watch?v=gAifFN0RJ0M
๐ณ๐ฟ jbkiwi
1 day ago
34 Posts
31 Followers
470 Likes
The VMW Marlin Cabin Cruiser by Robbob
The VMW Marlin Cabin Cruiser by Robbob
Preface.
At the time of writing, Iโve had the construction of this boat on โthe back burnerโ since July 2022. By then I had spent about two months on and off constructing the boat to a stage where I could consider applying a glassfibre cloth and epoxy finish to the hull. However I couldnโt spend any more time on the Marlin project as I had a more important project to undertake, which was to paint, decorate, refurbish and prepare our house for sale so that we could downsize and move to a new area now that our kids had all fled the nest.
Fast forward to today (mid-April 2025) and itโs taken a while to get the new house and gardens into shape and settle in, with the emphasis on converting my internal garage into a great new workshop, I can finally pick up from where I left off.
Introduction to the kit.
This new model is the latest undertaking by Vintage Model Works, now famous for their very popular models of the RAF Crash Rescue Tender and Thames River Police Boat kits which are based on old Aerokits and Veron designs.
The Marlin is a re-working of an original Veron design by the late Phil Smith in 1953. His son Colin Smith, who was also responsible for the re-design of the Thames River Police Boat, has made some changes to his fatherโs design to take advantage of more modern materials and production methods such as CNC and laser cutting.
The photograph below is of a prototype built by Colin Smith to give you an idea of how the boat looks in finished form. And there is also a review of the Marlin that appeared in Model Maker magazine, November 1953.
The size remains at 36โ and it employs the same construction method as the original. The spacious cabins of the boat makes it very easy to accommodate all the latest control hardware required, not that the original was lacking in that area even when the radio systems used valves and large batteries and the propulsion was usually IC or a large electric motor.
Even the pre-production sample the Vintage Model Works kit supplied to me is well presented with a full size drawing including a pictorial construction sequence and separate pages of building instructions.
All the required materials are supplied in quality ply, balsa, strip-wood and dowel including clear plastic sheets for the windscreens, and various white metal deck fittings. The builder is of course required to supply their own adhesives and paint of choice, as well as the propulsion, drive train and radio control gear. In the latter respect I will likely restrict control to throttle and rudder and not add any lighting or other features. That has already been done magnificently by Mike Turpin.
Construction.
As with the Thames river police boat, another Veron design, construction starts with the assembly of a box structure onto which formers and bulkheads are attached to make the basic hull shape.
I will be tackling this in the first part of my build blog which I hope you will enjoy following and I encourage you to ask questions, leave comments and hopefully some โlikesโ as I make progress.
Robbob.
๐ฌ๐ง robbob
2 days ago
2 Posts
2 Followers
6 Likes
US Coast Guard 110' ish WPB
It has been a while, health issues, other projects that had deadlines, and just too many projects. So, I buckled down, found the time, prioritized and came up with a build/complete schedule for partially built projects. This patrol boat project will be built and completed with the partially built (Almost complete 52' MLB Victory).
One of the reasons this can happen is my 3D printer is up and running again. I do not know why just every now and then it stops working correctly? Anyhow , Specifications:
Strange Scale it worked out to be: 1:42.75
Crew should be 40mm in height
Hull: an open-source Coast Guard 140' 3d printed hull with the aft chopped to make it 110' (Hence the "ish" in the title)
Propulsion: two shafted 380 brushed motors w/VEX robotics speed controller.
7.4 Lithium battery for power.
Pictures to follow, firewall where I am takes forever to allow.
Excelsior! Glad to be back to the hobby.
Remember, if you have a battleship feeling I still have free plans available. Not cheesy internet downloads, actual rolled or folded plans.
Yamato
Bismark
Littorio
Richelieu
WW2 LST X2
Arizona/Pennsylvania
Great White Fleet USS Michigan
Also a crazy complex Russian Ship of the Line
Always looking for Post FRAM Coast Guard 378' 1:96 plans, the ones I have are 1:200
Message me if interested. I will cover shipping to the US. Arrangements can be made for overseas.
Kevin
๐บ๐ธ KevinH
2 days ago