I am building a small satellite for my project in which I have to release a mechanism to eject the landing gear at a certain altitude before landing vertically. The landing gear will consist of spring-loaded rods, initially at 90 degree angle with respect to the circular base of diameter 2 inch. Each spring is going to be connected to a small metal piece. I'm thinking of using a servo motor to detach the metal piece before landing, so the rods will extend. What kind of servomotor will be appropriate for my project? Where can I find more info on servo motors? Thanks in advance for helping.