Children folding kayak "Yukaghir" by DarthCorvus

Last crawled date: 3 years ago

It's my first printable venicle project and there are two things because I did it:
1) There are almost no any folding kayaks for children.
2) I need a simpe project to start mayking kayaks with.
This kayak was designed for paddling learning on still water. It's enough fast for a little journey.
The type of construction is the same as Triton Ladoga 1, 70% scaled. All parts was re-designet to be 3d printable. The original Ladoga1 uses 20mm and 25mm aluminium alloy tubes and fiberglass-filled plastic connectors. Because non-composit ABS is not so strong so fiberglass-filled ABS, i use PVC tubes in my design, without scaling their diametres. So, because i did not scale tubes diameter, i can use 2 times less strong materials to make the same rigid and durability boat. The second thing I change is the lenght of stern. It is 140 mm longer to make kayak faster and more stable.
The main parameters:
Length - 3500 mm
Width - 450 mm
Sitting place width - 260 mm
Nominal load - 20-30 kg
Maximum load - 50 kg
Frames places (from nose, 1,2,3,5,6, in mm) - 620, 1180, 1740, 2310, 2900
(The 4-th frame is an additional one, needed for sitting place mounting and it's place can be some different)
Weight of assembled framework - 4.5 kg
Total weight - 7 kg
3d printer platform for making - 200x200 mm or more.
That's all screw:
M4 bolts:
45mm - 5pcs
35mm - 3pcs
30mm - 4pcs
25mm - 2 pcs
M4 nuts, self-fixing - 6pcs
M4 nuts - 7pcs
4mm washers - 12psc.
Also you need in PVC tubes. I use 25mm OD 22mm ID - 5x2m and 20mm OD 17.5mm ID - 12x2m. If you can find 3m length tubes it will make less garbage. And, what is more, you need about 200 ml of good plastic glue. I used "Moment crystal".
For "skin" I used PVC coated synthetic fabric 0.65 kg per m2, black for hool and yellow for deck and sponsors. Them are different only for colour.
Hool material spreads along the body and cutts to form sterns. The material must be tightened along the frame, so it's good idea to assemble the frame on any tape to be 2-3 cm shorter, then it will be, when doing this operation.
It's easier to glue the fabric first, and then sew them by strong thread.
For sterns watertight and more durable i glued 10 cm wide band of that black fabric along the keel and sterns.
I cut off the hool fabric on it's place, about 3 cm from the upper stringers. Do not tight the hool and deck fabric across the frame, the air sponsors will do it.
The deck material must be tightened along the frame, too. First of all i glued it, and then i did cockpit hole and sew perimeter to hool. Zippos are needed for assembling and simplifing packing goods.
Air sponsors are 280 cm long, and about 10 cm in diameter. Do not necessarily make them accurate, but airtight.
In assembling kayak, air sponsor goes from upper stringer, first frame to lower stringer 3-5 frames and then to upper stringer, 6 frame.
The seat made from 5mm plywood, 24x28 cm, but you can use any.
Backrest is standart one from kayak (see photo).
This kayak is really fast one, goes up to 5 kmh with my son, so I am planning some little weekend journeys now.
Warnings:
do not heat PVC tubes over 100°C. It will produce VERY TOXIC gases. 80-90°C is enough for forming.
do not use if there are more then 150 mm high water waves or more then 5 meters per second wind.
always use live vest.
there must be a second boat close to young paddler while learning.
UPD 7/3/2017 - paddle added http://www.thingiverse.com/thing:2160535
UPD 26/6/2017 - skin photos and text