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Wing Nut II   King Nuts

The Third HAPBY Boat

King Nuts Home - Construction


current status: bottom glassed, lower connection logs test-mounted

Hull Number: 0501-003
Owner: Stefan Probst
Hull Type: Wing Nut II
Hull Designer: Wing Nut: Bruce Hector, Wing Nut II modifications: Stefan Probst
Build Version: (not yet decided)
Overall Design: Stefan Probst
Overall Dimensions: Modules of 4'0" x 2'0",
Currently in Construction: 1 Pram Module (for bow), 2 Centre Modules, i.e. 12' total length
Weight: Hull: Centre Module: 12 kg each, Pram Module: 8 kg
Empty: (forecast: with connection logs slightly below 40 kg),
max. Displacement @ 0.5 ft: 50 kg per Pram Module, 110 kg per Centre Module
Manufacturer: HAPBY (Hanoi Private Boat Yards), a still purely virtual entity
Boat Yard: Kim Ma Thuong, Roof Terasse Dock
Construction Period: Starting end of July 2005
Launch: Planned for middle of November 2005
Builders: Anna-Ly Probst, Stefan Probst
Construction Type: Plywood, Framed
Construction Details: inside grade plywood:
bottom: 9 mm (3/8") ply / GF
sides: 9 mm (3/8"); bulkheads: 9 mm (3/8") ply
all plywood edges protected by logs and/or Epoxy fillets
inside and outside 2 layers Epoxy; bottom 1 layer glass fibre
inside and outside 3 layers latex based paint
Design Objectives: Provide a boat that can carry the whole family (2 adults, 1 kid).
To be propelled by oars, paddles, electric drive (trolling motor), and maybe sail.
Improve and test adapted technology (protected ply, paint to epoxy adhesion).
Assess suitability of new boat yard premises (moved from Thai Ha to Kim Ma Thuong).
Provide test platform for small electric propulsion systems.
Provide test platform for modular construction: Modular superstructure, modular hull.
Possibly use as outriggers (amas) for later boats.
Possibly use as hulls for modular cat platform.
Have fun.
Notes: Bruce Hector had the idea of scaling down the TIMS by a factor of 2:
4'x2'x1' instead of 8'x4'x2'. This gives a modular canoe, with very easily transportable modules, that can be stored inside and even used as a book shelf. His "Wing Nuts" consists of a sharpie bow with some rocker, two middle modules, and a transom stern with little rocker.
The small required building space, and its easy transport was very suitable for my situation. The modifications that led to Wing Nut II include:
- a much more elaborate system of logs to cover all ply edges.
- a "Sea of Peas" shaped pram bow with increased rocker.
- connection will be via long outside chine logs and rub rails, through the solid wood, leaving the ply untouched. There will be more bolts (for the wing nuts) than in the original Wing Nut. The bolts will be loaded for tension so that the connecting logs can take forces via friction. Forces that try to bend the assembly upwards or downwards along its centre line are therefore not handled by tensional forces on the bolts, but by shear forces on the bolts and friction of the connecting logs. The overall advantage of this is that the forces of waves and load is much better distributed over the hull.
Bottom line is, that from the original Wing Nut only the idea and the module dimensions are left. Therefore this design is called "Wing Nut II".