hello forum members,
                            i have built a quadcopter with total frame diameter of 45cm.actually we have a small competition in our college with the following size restrictions.
1)the total quad. should fit in a 30cm diameter round box.
2)it should go to a building which is 1km far and cover the activities going on there with a FPV system and return the initial position.
3)the quad. can be controlled with autopilot or manually with a transmitter.
4)one important note is it should have ultimate stability with maximum flight time.
      I wanna upgrade my quad. to the above specifications.so please give the suggestions regarding this...................................

What type of activity you will have to perform over there?

it should go to a building which is 1km far and cover the activities going on there with a FPV system and return the initial position....................