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Valve seats are often formed by first press-fitting an approximately cylindrical piece of a hardened metal alloy, such as Stellite, into a cast depression in a cylinder head above each eventual valve stem position, [1] and then machining a conical-section surface into the valve seat that will mate with a corresponding conical section of the ...
For ease of maintenance the Mk.10 was designed with modular assemblies, avoiding the need to remove the whole seat from the aircraft for minor servicing tasks. [1] The first successful emergency use of a Mk.10 seat involved a Red Arrows BAE Hawk on 17 May 1980 after the aircraft struck the mast of a yacht moored offshore at Brighton. [2]
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The Mk.4 seat was designed as an improved, lightweight version of earlier Martin-Baker seats for installation in a range of lighter, smaller aircraft types. [2] Improvements included a single combined seat and parachute quick release fastener (QRF) and a snubber mechanism to allow crews to lean forward without loosening the harness. [ 2 ]
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The Mk.5 seat was developed alongside the Mk.4 design to meet the needs of the United States Navy. Compared to the Mk.4 seat the structure and harnesses were strengthened to withstand higher crash landing loads, this resulted in a slight increase in weight. [2] Canopy breaking horns were added to allow ejection through an unjettisoned canopy. [2]
James Martin was born 11 September 1893 in the townland of Killinchy-in-the-Woods, known locally as Killinchy Woods (birthplace on what is now called Glasswater Road), Crossgar, County Down in Northern Ireland. He established his own engineering firm in 1929.