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