Lying in my hammock, I realised that nobody would design a parabolic shaped lounger.
I have seen spreader bars, tensioners, asym shapes, structural ridgelines, bridge hammocks, bat hammocks and such. These seem to modify the lay of the hammock, but fundamentally the hammock remains a simple (mathematically "second order") curve.
I wonder if anyone has done much in the way of modifying the contours of the hammock within the hammock itself, say adding back support etc.?
I saw schrochem's bridge hammock mod where he raises his upper torso by adding a pair of lines under the hammock and I realised that hammocks need not be made of one flat piece of material. One could alter the shape of a hammock by adding curves to the material.
One could sew elastic into a regular hammock in a pattern that would alter the shape to give a more comfortable position. If the elastic was in a channel, stitched at one end and with a toggle or buckle on the other end, the user could adjust the hammock to change lumber support or accomodate different genders' shape.
Likewise, one could build spectra lines into a string hammock by simply threading them through the spaces between the knots. A line tracing a parabolic curve would progressively change the speer/ banana hammock into a bridge hammock as tension was increased. It doesn't have to be parabolic. It could be parabolic, but narrow at the top to provide more back support, like schrochem's bridge hammock.
Let's please hear your comments and ideas.