A one-propeller drone or two-propeller with the propellers stack on top of each other are Helicopters.
A two- propeller drone is often referred to as a "Bi-copter" or "Du-copter."
A three-propeller drone is often referred to as Tri- chapter or Tri-rotor.
A four-propeller drone often referred to as a Quadcopter. This category only shows Bi-copters, Tri-chapter, and Quadcopter if you are looking for Helicopters click Here.
Bi-copters are generally more efficient than Quadcopters because they use less power to operate. This is due to having fewer motors and larger propellers, which can generate more lift. They can be controlled similarly to Quadcopters, using advanced algorithms to manage flight stability and maneuverability. The design typically allows for a more compact structure, making them potentially quieter and more robust. Bi-copters are suitable for various applications, including but not limed to:
v Aerial photography
v Inspections in hard-to-reach areas
v Recreational flying
Tri-rotors have three rotors, which can create unique flight dynamics. One rotor is often mounted at a variable angle to help control the drone's rotation, counteracting the natural tendency to spin due to the odd number of rotors. When designed correctly, Tri-rotors can offer stable flight characteristics. They can be agile and responsive, making them suitable for certain applications. The disadvantages are the variable angle rotor adds complexity to the design. Applications but not limited to are:
v Aerial Photography and Videography
v Industrial Inspections
v Crop Monitoring
v Surveillance
A Quadcopter, also known as a Quadrotor, is a type of remote-controlled drone that features four rotors. This design allows for stable flight and easy maneuverability, making it popular among hobbyists and professionals alike.
v Highly stable flight
v for photography and videography.
v Widely available
v tons of options
v Compact and portable
Then there are the big boys toys like Hexa-copter with six-propeller and the Octocopter with eight-propeller.
The Hexa-copter used for buy not limited to:
v Professionals
v Surveyor
v filmmakers
v higher payload
The Octocopter used for buy not limited to:
v Industrial work
v high-end filming
v heavy payloads