So much for a 'stealth project'.... it's a game and a half to hide the laavu goings-on!
I did a scale mock up at 1/10th (should have printed out a 'Betty' model, shouldn't I, give the whole project a bit of Fenna-appeal to go with the pink scale 'material'
) which maximises the available fabric useage at the rough dimensions bandied about earlier in the design. Initially I was a bit alarmed at the footprint and weight- it isn't going to be a lightweight option now for sure, especially when the liner is in too! But it'll be quite generous. I was surprised to see the effect on the laid out scale model of the distortion in comparison to the native indian tipi (which is designed on a half circle)- bringing the angle out and the apex a lot lower uses a good third more of the circle but wins you space exactly where the tipi lost out (around the head area- plenty vertically but that 45 degree setup was a design flaw for my useage).
Still unsure I was doing right, I've generated a full sized pattern piece, allowing 3cm for flat felled seam allowance and markings for the flyouts which will attach guys and liner. On a constant vigil for cost savings and useability in the field (woods, actually), I'm hoping to use loops of shock cord I already have and pin them together with sticks- light, loose-and-replaceable- rather than invest in plastic clips initially. If I use the system all round, I've found the elasticity very useful at keeping tension on pull outs on my homemade tarp so the system should be a good 'un. I'm toying with the idea of using something similar or the old lace through you'd see on the 9x9 and 10x10 army tents for the door rather than endless zips... I'll see how costs pan out but see a liner as a higher priority
I've got to pattern and sample the flyouts, vents (2 of, opposing sides, probably next panel to the door, probably about 15cm diameter, guesstimated rather than done the equations for air exchange!), consider the porch, chimney detailing, top... and source parts to make the chimney longer, including a spark arrester and butterfly, with a collar for both outer and liner (which can be moved up and down seperately). Cut out 10 panels and seam them (1 door, 2 vented, 7 plain). Call back in 6 months for an update
When I thought I was going to have to shelve the laavu, I did some very rough scales of loues and campfire tents... I'll bang the pic on just incase it helps anyone/ me in future if I don't get on with laav'ing