Retractable wheels on aircraft are often called "landing gear", and some of the engine designs used in aircraft can contain a gear box. But gears as they look like in cars aren't used in aircraft.
The Helio Courier is a fixed gear aircraft; no retractable gear.
The landing gear of an aircraft are the fixtures on which the aircraft taxi's, take's off and lands and can be in the form of wheels, or pontoons (on float planes for water take-off and landing).The undercarriage of an aircraft can also be fixed or retractable. Large commercial aircraft such as a Boeing 747 for example will have retractable undercarriage, creating a far more aerodynamic airflow over the fuselage. On a much smaller scale, some aircraft such as Cessna 172's have been manufactured in both fixed and retractable gear "RG" models. Generally the very light aircraft will have fixed landing gear.AnswerThe primary role of the landing gear is to absorb the shock of landing the airplane as it comes in contact with the ground. It is designed as a shock attenuation device. It absorbs the shock and slows the vertical drop of the airplane.
There is nothing to stop you from flying a retractable gear airplane with the gear always down. If the landing gear is permanently fixed in the extended position, the FAA requires that the gear-retraction lever (or switch) be removed or placarded as "inoperative". Additionally, retractable-gear aircraft have a maximum speed permissible with gear extended (VLE) obviously, the aircraft would be permanently limited to this speed.
That would be retractable landing gear. They're present on aircraft because retracting the landing gear makes the aircraft more aerodynamic by eliminating the drag which would be caused by having the gear permanently fixed or extended. This saves fuel and improves cruising speeds.
On the Landing gear
A "complex aircraft" is an aircraft which has a constant-speed propeller and/or retractable landing gear. The FAA requires pilots to attain the "complex aircraft" license endorsement before they are permitted to act as "Pilot in command" for such aircraft.
it helps with aero dynamics+safety issues+fuel effinciency probably other easons but those are the main ones.
Sequence valves are used in aircraft having a retractable undercarriage because there is a certain sequence to the way things must be done. For example, before the landing gear can come down, the door on the undercarriage must be opened for it.
All of the landing gear on the particular aircraft.
A belly landing is a landing of an aircraft without the landing gear being deployed.
A belly landing is a landing of an aircraft without the landing gear being deployed.