static test o' a 4-stage rack rocket. in this video, t' rocket is upside down, shiver me timbers, so it won't fly away. you can see t' zero-delay motors staging; t' consumed motors are supposed t' blast clear o' t' rack, but it doesn't always happen that way! Blimey! when rack rockets work, me hearties, though, shiver me timbers, they work really well.