Tilt-frame UAV for agricultural air sampling with a propeller-thrust-governing system that facilitates VTOL capability

An aircraft, which is capable of vertical takeoff and landing, comprising:

• a fuselage;
• a probe-deployment mechanism located at a front end of the fuselage, wherein:
• the probe-deployment mechanism is configured to deploy a sample-gathering probe;
• and
• when the aircraft is pitched up, the front end of the fuselage sits higher than a rear end of the fuselage to allow the probe-deployment mechanism to extend higher;
• a main wing coupled to a middle section of the fuselage;
• a right motor and associated right propeller coupled to a right side of the main wing;
• a right propeller-thrust-governing system (PTGS) located in proximity to the right propeller;
• a left motor and associated left propeller coupled to a left side of the main wing;
• a left PTGS located in proximity to the left propeller;
• and
• a pitch motor and associated pitch propeller located at the rear end of the fuselage, wherein the pitch propeller is angled to provide substantially vertical thrust to control a pitch of the fuselage;
• wherein:
• each PTGS comprises a pair of adjustable butterfly flaps located in an airflow of an associated propeller;
• each pair of butterfly flaps includes a front flap and a rear flap;
• and
• the front flap and rear flap open in opposing directions.