SNW spock for all ship types to improve crit chance whcih feeds into Changs abaility to delay weapon fire from the enemy. This crew is most effective if you have Max Belanna torres below deck. If not see crew Chang - no Max BLT. Trip is there to reduce crit damage of the hostile which is one of its most potent abilities. If flying and explorer this crew has additional potency as you can stack defence for increasing mitigation when fighting explorers.