After my involuntary bathing episode at Short Creek (go ahead and laugh, I did, still am) and subsequent gained knowledge from the experience (never try to squeeze a fat boy in a gofer hole). I have started on Kayak Design #2.
Following are the features that I have tried to adapt/incorporate into design #2.
#1 Larger cockpit. Lesson learned. While my brain says I am still twenty years old, my body is saying it is ninety. I just have to face up to the fact that I am just not as flexible as I use to be, combine that with my bad arm and I just don’t have the ability to get myself into a cockpit that is 25” by 20” (That is 63.5 cm by 50.8 cm for you metric people). Picture this…watermelon and a garden hose. So in the new design, I increased the length of the cockpit to 32” (81.2 cm).
#2 Hull shape. While the Inuit have proven that a deep V shaped hull works great, I have proven that you need to have the skill to use it. And I don’t…yet. In the new design, I have changed the hull shape from the deep V to a flattish, rounded multiple chine.
#3 Rudder/skeg. In an effort to reduce weather head in the new design I have allotted area to rear mount a rudder or skeg.
#4 Rocker. In the new design, I have all but eliminated the fore and aft rocker. I have done this because the intent for the kayak is flat water, i.e. lakes, rivers, etc. where rocker is not much of an issue. As I have said previously, I am not a white water guy, I have too many broken body parts that cant be fixed again if I wreck them…so no rough stuff for me.
#5 Flotation. In some kayak designs, flotation bags are used to restrict the amount of water entering the kayak when you flip it. Other designs use bulkheads to do the same thing. In the new design, I am going to try something that I call soft bulkheads. Since I will be using a type of fuselage framework, I will cover one side with the ballistic nylon and water seal it. (I can hear the comments now…but it will leak around the edges by the skin.) Yes it will leak around the edges of the frame…a lot since there is a 3/8” (9.5 mm) gap between the frame and the skin. And that is exactly why I am going to affix 1/2” (12.5 mm) closed cell foam to the gap area. It will not totally stop water from passing, but it will drastically decrease the influx. And that is why I am calling it a ‘soft bulkhead’.
#6 Bow and Stern Access. On the new design I am including both bow and stern access simply because reaching and stuff is a giant pain in the ass. And hatches will allow access to the bulkhead areas. Because I am a cheap bastard and like making things for myself, the access hatches will be constructed along the same principal as the cockpit cover/spray skirt. Three millimeter neoprene with a shock corded edge.
(All the boring numbers. Skip to the bottom for images)
|Length over all||18.0′ (5.48m)|
|Beam over all||24” (61 cm)|
|Design draft||4” (102 mm)|
|Displaced volume||5.83 cf. (165.0 liters)|
|Displacement||334 lbs (151 kg)|
|Vert. prismatic coefficient||0.8|
|Wetted surface area||27.72 ft^2 (2.575 m^2)|
|Longitudinal center of buoyancy||8.94′ (2.72 m)|
|Longitudinal center of buoyancy||-0.32%|
|Length on waterline||18.0′ (5.48m)|
|Beam on waterline||22.25” (56.51 cm)|
|Waterplane area||22.02 ft^2 (2.04 m^2)|
|Waterplane center of flotation||8.94′ (2.72 m)|
|Entrance angle||9.295 degrees|
|Transverse moment of inertia||4.322 ft^4 (0.0373 m^4)|
|Longitudinal moment of inertia||349.80 ft^4 (3.019 m^4)|
|Transverse metacentric height||11.1” (28.2 cm)|
|Longitudinal metacentric height||60.15′ (18.33 m)|