What is shimmy in landing gear?
Shimmy is an oscillation in aircraft landing gear that can occur both on landing and take-off, typically in a band of velocities. It causes excessive wear on components and can cause accidents. Shimmy is (or at least includes) oscillation of the wheel assembly about this vertical axis.
When was the landing gear invented?
Wheels-up! The retractable landing gear that is now commonplace on commercial and military aircraft was first developed for Glen Curtiss’ Triad airplane in 1911.
Who invented landing gear?
It is not very well known that Leonardo da Vinci invented the worlds first landing gear system for an aircraft. Obviously while he was designing and contemplating his flying machines he realized the simple rule – “what goes up, must come down”.
What is the purpose of the shimmy damper?
The shimmy damper is a hydraulic fluid-filled cylinder that prevents rapid movement of the nose or main landing gear without interfering with slower operations.
What causes nose wheel shimmy?
An imbalance in the nose tire and wheel assembly can cause a vibration in the nosegear. Uneven tire wear can also cause nose vibrations. An overly inflated nose tire can also contribute to a nosewheel shimmy. A damper that is low on fluid or is excessively worn internally will most assuredly result in a nose shimmy.
Why are landing gears important?
The purpose of the landing gear in an aircraft is to provide a suspension system during taxi, take-off and landing. It is designed to absorb and dissipate the kinetic energy of landing impact, thereby reducing the impact loads transmitted to the airframe.
What is the purpose of landing gear?
What is the nose wheel shimmy?
A nosewheel shimmy is a rapid back-and-forth oscillation of the steerable part of the nosegear and wheel. It can be caused by a variety of problems, and it sometimes takes more than one trip to the shop to get the issue resolved. The nosegear has several points at which it pivots and rotates.
How do I stop shimmy?
The key to avoiding shimmy problems is to prevent them from starting in the first place.
- First, look for any un-dampered nose gear movement. This is motion of the nose tire without the shimmy damper moving.
- Next, remove the shimmy damper attachments.
- Nose gear rigging is also important to prevent shimmy.
How does a landing gear retract?
Landing Gear Systems An electrical landing gear retraction system utilizes an electrically-driven motor for gear operation. Struts are also activated that open and close the gear doors. If the switch is moved to the DOWN position, the motor reverses and the gear moves down and locks.