Why is it called oleo strut?
It had been derived from the recuperative gear design of the Vickers gun, controlling recoil by forcing oil through precisely sized orifices. Vickers’ oleo strut was first applied to an aeroplane by the French aircraft company Breguet Aviation.
How does an oleo strut work?
Oleo struts absorb and dissipate shock loads using a combination of two fluids — a gas and a hydraulic fluid — contained in two chambers — a cylinder and a piston. Gas in the upper chamber, functioning like a spring, is compressed by the hydraulic fluid to absorb the impact of touchdown as well as bumps during taxiing.
How does a strut pump work?
Simply hook up the output hose to the strut and the inlet to a pressure source such as shop air or regulated nitrogen. Cycling the slide valve forces a single precise shot of high pressure air into the strut. Operator raises pressure in increments, maximizing control and minimizing chance or over-pressure.
What is the difference between spring oleo struts and air oleo shock struts?
In spring oleo struts, the spring supports the A/C weight on the ground and during taxiing and oleo strut aborts the shock of landing. In air oleo struts, the air supports the A/C weight on the ground and abserts shocks during taxiing and oleo strut aborts the shock of landing.
Which type of landing gear is most commonly used today?
tricycle-type gear
Arguably the most common type of landing gear,tricycle-type gear includes the main gear and the nose gear. It’s typically used on both large and light aircraft. With this design, the two main wheels are attached to the airframe behind the center of gravity.
What does oleo imply with regards to shock struts?
oleo strut in American English noun. a hydraulic device used as a shock absorber in the landing gear of aircraft, consisting of an oil-filled cylinder fitted with a hollow, perforated piston into which oil is slowly forced when a compressive force is applied to the landing gear, as in a landing.
What are the three types of landing gear?
Landing gear usually comes in three basic wheel arrangements: conventional, tandem and tricycle-type. Beyond this, landing gear is then classified as either fixed or retractable.
What is the first step in servicing shock struts?
Release any air pressure in the shock strut. Remove the air service valve assembly. Fill the strut to the level of the service port with approved hydraulic fluid. Attach the bleed hose to the service port and insert the free end of the hose into a container of clean hydraulic fluid.
How big is an oleo shock strut in inches?
At 1,200 psi, this requires a piston cross-sectional area of a bit over 2 square inches, which translates into a piston diameter of about 1.7 inches. Cutaway view of an oleo strut, showing fluid flow through the variable orifice during compression and extension.
How does an oleopneumatic shock strut work?
An orifice plate divides the strut into two chambers. A tapered metering pin constricts the orifice as the strut compresses, resulting in a soft reaction at initial touchdown and increased stiffness and damping as the strut approaches its fully-compressed state.
How does a metering pin work on an oleo strut?
Most oleo struts employ a tapered “metering pin” to vary the effective size of the orifice and therefore the rate of fluid flow from one chamber to the other.
How much pressure does a strut pump put on an airplane?
Aircraft Strut Pump 10X delivers up to 1,500 PSI of pressure to raises struts without the need to place the airplane on jacks.