I've got to admit that I haven't tried ground launching it, but I got my hands on a GLS-XF 109sqf from Daedalus (http://www.nzaerosports.com/massive-information/ground-launch)
It's an amazing canopy for day to day skyidiving if you are into faster landings without going x-braced, but I'm having some difficulties selling it on. Most people don't know the speedwings and are reluctant on buying them, do you guys know some market places for speedwings?