serene – 2, part 7

‘ve been thinking about kayak hatches over and over again. Starting from the very early days with my plywood hatches (in Hello World – 2, 3) which are obviously not watertight, to the Beckson hatches on my Serene – 1 kayak. The Beckson is very good, watertight and even air tight, but sadly that’s only true in ideal conditions. In reality, in multiple days trip, when mud and sand has get into, it would leak by a small amount.

The Beckson is not ideal hatch for kayak in my idea (for other purposes, it may be ok). The reason is that the hatches are built flushed with the mounting surface, and some inner elements are even recessed… When the water washes over (as always happened to the very low freeboard of a sea kayak), and when the O – rings are not properly lubricated, or when there’re some mud, sand inside the joints, water would leak in.

That’s why I decided to build my own hatches for this Serene – 2 new kayak. The idea is really simple: the hatches are raised a few centimeters above the mounting surface, and even when the seals are not too tight, that would suffice to keep most of the water out. Examine many sea kayak hatch designs, I’ve found out that simple thing, that the hatches should be raised (not flushed or recessed) above the deck.

1st image: cutting thin (2.5 mm) wooden strips used to build the hatches. 2nd, 3nd images: the 3 MDF templates for hatch building: the rear, the front and the day hatch, sizes in diameter: 30, 25 and 20 cm respectively. 4th image: building the hatches’ coaming with thin wooden strips around the templates, each coaming consists of 2 layers of strips which bend easily around without cracks and without the need for steaming.

serene – 2, part 6

inished with Serene – 2‘s first paddle, continue to the second one. This would be the pair of paddles, one Greenland style, and one Euro style, that I would use on the new kayak, intended to be slightly smaller in size, and much more lightweight compared to my previous ones. The Greenland paddle is not a typical Greenland one, it’s rather quite short with bigger blades, and the Euro paddle is not of typical Euro style neither 😀.

As it is quite small compared to most Euro style paddles. It’s quite hard to justify my design decisions, but all came from my paddling experiences, that I would need a slightly bigger Greenland paddle for all – round paddling, and a slightly smaller Euro paddle to provide more power in “adversary” conditions. The second one would be lightly & simply built also, with that same kind of rattan shaft, and thin plywood blades.

1st image: the finished Greenland paddle. 2nd image: dry fitting the Euro paddle’s blades and shaft. 3th image: bending the plywood blades, I want them to be just slightly curved around the longitudinal axis, it’s just nearly impossible to bend the plywood around multiple axes, to decided to stay with the simplest blade design. After gluing the blades and shaft together, the paddle would receive a layer of fiberglass all around.

4th image: glassing the second paddle, next to it is the finished Greenland paddle, the pair of paddles near completion, they all need to be “trialled” soon, to evaluate their performances, and to see how they would behave in real world. Final weights, the Greenland paddle: 0.82 kg, the Euro paddle: 0.9 kg, not up to the “standards” yet, but quite near, that’s fine anyhow, as they’re very light (compared to my previous paddles) 😀.

nhện nước

ái con nhện nước khổng lồ, cái loài quái vật chạy trên 6 chân ấy, lao đến với một tốc độ kinh hoàng! Cách xa nhiều cây số đã nghe tiếng rì rì, cái động cơ CCCP ầm ĩ. Nó đang lướt đến gần, nghênh ngang chẳng đếm xỉa đến ai. Có thể thấy rõ phần đuôi tàu “drift”, hơi đảo qua đảo lại khi chạy ở tốc độ cao, hầu như toàn thân tàu đã bốc hẳn lên khỏi mặt nước…

Tự hỏi không biết nó có thấy cái xuồng bé xíu như cái vỏ đậu phộng của mình không? Mà thấy hay không thấy thì cũng chẳng làm gì được, với cái vận tốc như tên bắn của nó, và cái tốc độ chèo như rùa bò của mình. Bình thản ngồi chờ con quái vật đến, giương máy ảnh lên làm 1 kiểu. Cuối cùng thì nó lướt qua cách chưa đầy 50m… tạo nên những con sóng be bé tầm 1m.

my possession

Kéo cưa, lừa xẻ,
Ông thợ nào khoẻ,
Thì ăn cơm vua.
Ông thợ nào thua,
Thì về bú tí.

leaning and tidying up the workshop in preparation for my next Serene – 2 build. Having a chance to look back at the past few years’ works. Apart from Hello World – 1, my first build, a small canoe which is no longer functional (it was turned into an in – house shelf), the 3 kayaks seen here are built in a 3 – years time span, one in each year. Still feel not having enough of them, still in the quest for my “perfect expeditional kayak”! 😀

Hello World – 1 photo albums: part 1, part 2
Hello World – 2 photo albums: part 1, part 2
Hello World – 3 photo albums: part 1, part 2, part 3
Serene – 1 photo albums: part 1, part 2, part 3, part 4
Serene – 2 photo albums: part 1, part 2, part 3, part 4

ái tình

hớ cái film truyền hình TQ gì xa xưa lắm rồi, có cảnh cô nàng kề dao vào cổ hỏi chồng có yêu không, còn anh chàng thì phải chép phạt 2 chữ này đầy bảng. P/S: thời buổi công nghệ, chép phạt thật quá dể dàng. Hình này là chép trên iPad rất nhiều năm về trước… 🙂

serene – 2, part 5

he first image: cutting two hardwood blocks to attach to the paddle’s 2 ends, 2nd image: scraping the paddle blades with a power planer and a spokeshave. 3rd image: the paddle takes its final shape, next it would be sanded, colored (stained with thinned epoxy), glassed then painted. The paddle would receive a layer of fiberglass all over the body, to waterproof the porous balsa wood, and to strengthen the whole structure.

This is only the first of two paddles I’d intended to build. A lightweight Greenland paddle would be my convenient, all – round thing to propel the boat with. But under some particular circumstances, e.g: very strong wind or current, I would need a more powerful tool, that’s why my next one would be a paddle of the usual Euro type, it would be also very lightly built, and has much smaller blades, around 50 x 14 cm in dimensions.

I’ve not yet to really realize which paddle type is better: Greenland or Euro, but thought that they all has their uses in different situations, and decided to build and use… both. Also, my paddles all has become smaller and shorter, their lengths now are around 1.85 ~ 1.9 m. My thought is that sea – kayakers nowadays are using paddles that are longer than needed (around 2.2 m), especially those going for long touring.

I made a terrible mistake, using the wrong duct tape to mask the paddle for coloring. A kind of 3M duct tape is so sticky that it’s extremely hard to be removed after having painted the paddle blades with colored – thinned – epoxy. I seriously scratch the surface while removing the duct tape (with a chisel) resulting in a very poor finish on one blade 😢. The paddle would be perfectly usable, but not as good – looking as I’d expected.

serene – 2, part 4

till don’t have some free times to start my Serene – 2 kayak building yet, and all preparations (mainly materials purchasing) has not been completed. So I start slowly with building some other miscellaneous objects. First are the paddles. A typical WRC (Western Red Cedar) Greenland paddle weights around 0.7 ~ 0.8 kg. My two paddles, built with tropical hardwoods, though durable, weigh too much: 1.3 ~ 1.5 kg.

A lightweight paddle has very obvious advantages on long journeys, and I’ve been thinking about resolving this weighting issue. So I’ve decided to realize an idea which I’ve been having for a long while, in a tropical country like Vietnam, the best material you could use for a paddle is… rattan. Rattan is very lightweight, but it’s also very durable, flexible, and stiff, an ideal material to be used for building the paddle’s shaft.

In order to keep weight to minimum, in combination with the rattan stick, I use balsa wood for the blades. Construction is quite simple indeed, the rattan stick is splitted into two halves at the two ends, and two balsa wood blocks are inserted to form the blades’ shape (see the 3rd image). Balsa wood is quite hard to acquire in Vietnam, I’d made the wood block from 6 small 5 – mm – thick balsa sheets, laminated together.

Next is the job of careful – carving down the blades’ shapes. The 4th image: empty spaces at the two ends of the paddle, that would be the places for two hardwood blocks in order to better resist against cracks upon physical impact. The paddle would receive a layer of glass to further strengthen the structure and to protect it against water. Balsa is too porous and without protection, it would takes on water in the long term.

khỉ & chuối

gười ta làm 1 thí nghiệm như thế này: nhốt 4 chú khỉ vào chuồng, và có 1 trái chuối làm mồi nhử. Hể con nào động vào quả chuối thì nó kích hoạt vòi nước phun ướt hết. Không lâu sau đó hình thành 1 phản xạ có điều kiện, cứ con khỉ nào động vào quả chuối là bị 3 con kia xúm lại đánh, vì đứa nào cũng thích chuối, nhưng dĩ nhiên đứa nào cũng sợ bị ướt.

Sau đó người ta lấy bớt 1 chú khỉ ra, thay bằng 1 chú khỉ khác. Nhưng lần này, người ta đổi cơ chế, động vào quả chuối thì nước không phun ra nữa. Chú khỉ mới chưa biết luật, động vào quả chuối, thế là bị oánh. Dù nước không phun ra nữa nhưng kinh nghiệm bị ướt của 3 con khỉ kia đủ mạnh để oánh bất cứ kẻ nào động vào quả chuối.

Cứ lặp lại như thế, lại lôi 1 chú khỉ ra, thay vào bằng 1 con mới, lần lượt từng con, cho đến khi toàn bộ khỉ trong chuồng đều mớ! Nhưng cái phản xạ kia được duy trì. Cứ ai động vào quả chuối là bị oánh, dù cả 4 con khỉ, không có con nào từng trãi qua cái kinh nghiệm bị ướt, vì cả 4 con đều được thay vào lần lượt như đã nói ở trên.

Như thế cái bài học bị nước phun kia nó đi vào tiềm thức, lan truyền trong cộng đồng, gọi là “ký ức xã hội”, dù nguy cơ bị nước phun ướt từ lâu không còn hiện hữu. Nghĩ đi nghĩ lại, thấy XH VN cũng thế, nhiều vấn đề lịch sử, chính trị… đã vĩnh viễn qua đi, không còn thường trực đe doạ, nhưng cứ ai… động vào quả chuối là bị oánh! 😀