A stability test in which a strin' is attached t' a model rocket at t' center o' gravity and then swung around t' head. Avast, me proud beauty! If t' model is stable, it will head nose into t' direction o' travel. Begad! This test has a large margin o' error, thus producin' models often overly stable. It can nay be used for large rockets, shiver me timbers, unless Kin' Kong consents t' twirl t' string. Ahoy! Sometimes called a strin' test.