When is the use of electronically actuated recovery systems necessary?

The necessity of using electronically actuated recovery systems is tied to the level of impulse that a rocket can generate. When the installed impulse exceeds 2560 N-sec, the forces involved during the rocket's flight become substantial, and relying on traditional recovery methods may not ensure safety and control during descent. Electrically actuated recovery systems provide a means to reliably deploy recovery devices such as parachutes under high-stress situations.

In rockets with high impulse, mechanical recovery systems can fail due to the forces exerted on them during deployment or descent, which poses a risk to both the rocket and bystanders. Electrically actuated systems help alleviate these risks by providing a more reliable deployment mechanism that can be triggered under controlled conditions, ensuring the rocket returns safely and predictably.

The other options do not accurately capture the specific conditions under which electronically actuated recovery systems become necessary. While rockets over 15 kg (as included in one option) may require special considerations, the critical threshold for deployment with electronic systems is based on impulse rather than weight or launch time conditions.