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