Which method of recovery is not considered an active recovery method and is NOT likely to be safe for a high power rocket?

Tumble recovery is indeed classified as a passive recovery method, which means it relies on the natural aerodynamic properties of the rocket during descent rather than any active control mechanisms. In contrast to methods such as dual deploy systems, which use staged deployment of parachutes for a controlled descent, tumble recovery does not involve any action or system designed to stabilize or slow the descent actively.

In high power rocketry, the main concern with using tumble recovery stems from the unpredictability this method introduces. A rocket returning via tumble recovery can spin or tumble uncontrollably, increasing the risk of structural damage or failure during descent due to aerodynamic forces. This can also lead to difficulties in accurately locating the rocket after it lands, as its descent behavior is not predictable.

In summary, tumble recovery lacks the active mechanisms and control seen in alternative methods, making it less safe and effective for high power rockets. Its reliance on random aerodynamic behavior poses significant safety risks compared to other recovery methods designed for stability and precision.