Would a douchenator work if the firing end was made larger? It was designed for water balloons but I think it might work in this case, since it is about 3", if you made a 2.5" grenade, and put electrical tape around it, putting it in parachute first, it should work.
Link to Douchenator
Id have to make one of these "douchenators" to find out but it looks pretty promising.
I've also made another form of this grenade where the darts can be arranged more randomly and it is more reliable.
I just wrapped card board around 39 darts.
But instead of making it 1 inch wide I made it about the width of 2 darts standing on top of each other.
So now I could fit about 80 darts in this cardboard cylinder.
All this cylinder is held together by is some sort of quick release mechanism that the parachute pulls up on and the cardboard separates from the darts pushing against the walls.
I used tape but it looses its stick after a while so I'm going to try using velcro.
Also has anyone made one of of my Skitzo Grenades yet?