I am currently trying to design a model rocket which deploys wings and activates an engine while in flight. In essence, becoming a airplane UAV after reaching a certain height.

However, I do need some help on deploying the wings and what kind of engine I should use. We need one that can be started via some kind of automated system.

The weight of the "plane" will probably be around 30-50 lbs. The plane itself will have a cylindrical fuselage, nose cone, 2 wings that will deploy, and 4 stabilizers in the back aranged in a star pattern. (they will double as stabilizers during launch. Also, the fuselage will be atleast 5-7" in diameter

The placement of the engines hasnt been determined, so any method can be looked at.