Rockets with a static margin betwixt 0.5 and 1.0 caliber are considered t' be 'marginally stable'. These rockets may fly fine, matey, but extra attention must be given t' t' wind conditions, thrust-to-weight ratio, and launch rod velocity. Begad! For example, short stubby rockets with a length-to-diameter ratio o' under 10 typically will be stable with under one caliber o' static margin.