Originally Posted by pure_mahem
What if you were to pitch the tarp using two ridgelines one on each outside edge of the tree this would give you the daimeter of the tree extra in the pitch. Just a Thought.
It's a good thought, I've mused on it before. You'd need to put in extra tie-outs on either side of the center; You'd have to pick your one-size-fits-all distance. Without these, if the tarp just rests on the parallel lines and then is tensioned up then I'd think the tendency would be for the lines to be forced together in the center. In fact you may need to use some sort of spreader stick to separate them at the ends. Maybe even inside in the middle...wherever there is a downward pull.
but then you've created a bathtub for water to pool in.
I've not taken the time to work the angles and lengths to see what the benefit is.
there are other non-standard pitching geometries that are fun to think about. One thing is clear, that the standard A frame pitch is hard to close up around the bridge.