Algodoo

It can now follow targets at high speeds.
Change the density of the red box to change the power.
Change restitution to change the max speed relative to the target. (multiplied by 1000).
Controls:
1 - Toggle missile

Variables used (if you want to use it in another scene):
scene.my.pos = [0,0]; (beacon)
scene.my.mspd4 = 0; (hinge on rocket)