The type of fluid in an oleo strut will depend upon
- the type of seal material.
- heat generated in operation of the system.
- type of fluid most readily available.
Explanation
An oleo strut absorbs landing energy by forcing oil through a metering orifice, and that work heats the fluid. The fluid is therefore selected for its viscosity stability and resistance to breakdown at the operating temperatures the strut reaches, so the choice of fluid depends on the heat generated in operation rather than on seal material or mere availability.
Trevordodd asking:
i thought the answer to this question was type of seal material, does anyone know why its heat generated in operation as the type of fluid may break the seal down.
Community Comments (1)
A
aerorodder1 Posts: 20 19.12.2015 / 08:22
They don't design struts to use certain o-rings, they design it for strength and to find the appropriate fluids and corresponding compressibility/heat-factors. The compressibility of a fluid determines it heat factor...you could use water in a shock-strut but it wouldn't compress as much as hydraulic fluids do and wouldn't generate as much heat.
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