I built a "Sidearm" self-aspirated burner just for the hell of it.
Might use it to melt some aluminum and/or brass, and for larger
heating tasks. It was worth doing just to see and hear it work.
It's a pretty impressive propane torch. It runs well at gas pressures
from 5 to 30 PSI, probably higher once I get a choke made for it.

http://users.goldengate.net/~dforeman/sidearm_burner/