A stability test in which a strin' is attached t' a model rocket at t' center o' gravity and then swung around t' head. Well, blow me down! 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, matey, thus producin' models often overly stable. Ya scallywag! It can nay be used for large rockets, arrr, unless Kin' Kong consents t' twirl t' string. Avast, me proud beauty! Sometimes called a strin' test.