FAA Regulation

It must not contain exposed rotating parts that can lacerate.  It must not contain exposed rotating parts that can lacerate and must not cause injury equivalent to 11 ft-lb of kinetic energy.

Yes, it will cost $5 per aircraft. They don’t need to, your aircraft are already registered and your pilots are certificated. No, they will have to obtain operating authority from the Department of Transportation.

The Administrator, authorized representatives from the NTSB or TSA, or any Federal, State, or Local Law enforcement officers.  The General Public and any Government Employees. Any Government employee.

No more than three as long as the Remote PIC maintains visual line of sight. As many as he/she can handle. No more than one. 

The FAA’s DOC list. The FAA DroneZone. The manufacturer’s website.

September 30th, two years from this year.  October 25th, one year from this year. October 31st, two years from this year.

does not contain any exposed rotating parts that would lacerate human skins upon impact. has an airworthiness certificate issued under Part 21.  is labeled as Category 4.

Visual observer. Person manipulating the controls. Remote Pilot in Command (Remote PIC). 

No, the other people in the park are not on notice.  Yes, as long as the park is not busy enough that it would be considered an open-air assembly of human beings.

ensure that the human beings who are not participating in the operation are under a covered structure or inside a non-moving vehicle. ensure the sUAS is equipped with a parachute make sure the area is closed or restricted-access.