Yet another DIY-project...
I have been playing with Google Sketchup to make a one-piece lavvu from a standard plastic tarpaulin.
The tarpaulin is 8 by 5 meters and in 180gram/sqm weight.
By drawing the tarp and a circle with radius = tarp long side / 2 you get a pie segment that determines how big the lavvu will be.
My tarp (8x5m) gives a pie 'segment' with radius 4m, and pie outer rim 14,6m.
The radius will be the length of the outer wall of the lavvu and the outer rim of the pie segment will be the circumference of the lavvu when erected.
So by simple maths the radius of the lavvu will be 14,6/3,14/2=2,3m (r=O/pi/2)
The height will be (according to Pythagoras) the square root of 4*4 - 2,3*2,3=3,25m. And Sketchup gives the inner area 16,8 square meters...
Now it's just to draw the circle/pie segment on the tarp and cut it out.
I also cut out a small circle at the 'top'/the center, for the smoke hole.
Along the edges where the sides will meet on the lavvu, make 6 times 2 holes at each edge to allow the edges to be "sewn" together with sticks, like the indians made up their Tipis. I fitted aluminium eyelets to the holes.
Then get 12 pine poles, ca 4,3 m long.
Tie 3 of them together at just under 4 meter and erect them with radius 2,3m. After that erect the rest of the poles at equal distances and cover it all with the tarp. Then line up the holes on the edges and fasten them with short sticks.
The erected lavvu.
The door, 2 pieces of scrap tarp material glued and 'sewn' together with washing line.
The pine poles gives the door rigidity. They should be so long so they rest on the 2 standing poles at the door.
Details of the sticks holding the lavvu together. The door is just hanging from one of the sticks with a piece of washing line.
The 'Berjas', a piece of double burlap with pockets sewn in the corners for stones. The Berjas is used for rain/mosquito protection and fire draft regulation. It's manouvered with a pole from the outside.
Plenty of room, 7 people can sleep with spare room over.
So far, me and our youngest daughter have slept 5 nights in it