for 2 rocket per min. https://kirkmcdonald.github.io/calc.html#zip=dVLtbsMgDHyb/ApaulbdlCkP44KbWjUQGdOte/q5H5uWKpUQEnecz5wJoDB0bvXmtl0joDiUJlIaNk2Iw7Ruwm4ol90Pq21zojLs8ldDirEMUDVHUMrJFU+YPLoJ/LGXftV1L+uW80hFyS+zkZgU5LzM+gNG8sDLbNWL+Il0khyqf95WsRMuUk00JaO9zPsaK4Nm6XH9t1oIJzBRcJnYmY/HUiiN/UdZ969di4xexR68r5LMZKbdkyBIdBFG+KY0J0fBBGGOHRBO56uTF2vy1+e9pVRQFOetcd2ZMyS9X5oIxZvGSa4plGXbiaYH4J7d6ZLuLY0ZLxBAHhDiOZD9EdVylVsrm64t9q3YBjavVTKD2L2E/IhTsAiR3V5ydEzjQS85XMutNjZAtBEsdFc0J3SfwA8FK9tA7rncDjYj8BTumAqkMmVRt0PW/9of