I think it is better to assume that monomolecular is just sci-fi
speak for very thin very strong rather than literally one
molecule. Once you get to the molecular level the physics just
start to work differently. You have to think about the strength
of the bonds between molecules and the bond between atoms in
those molecules. The best analogy I can think of is imagine
trying to use a chain of magnets to cut apart a ball of magnets.
And to put it into scale the ball you are cutting through has to
be the size of a house. Your chain of magnets (or molecules) has
to be held together more strongly than whatever you are cutting
and that is just one of the problems. But even ignoring the
monomolecular bit you still run into problems with the idea of a
web spinner. Anything spread out that much would create huge
amounts of drag. Yes, you can overcome this by weighting the
edges but then you have to propel the weights with enough force
to overcome the web parachute slowing them down. It is more
practical to just proje