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Engine designator question
I know what *most* of the letters that show up in engine designators
mean (e.g. TSIO-540, AEIO-540), but there are two I can't figure out and can't find any information about, viz S and E. They seem to show up with T (turbo) and A (aerobatic/inverted) respectively, but that do they actually mean? Thanks, John |
#2
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The "S" associated with T (i.e. TSIO-540) means supercharged. Turbo is not the
only method of supercharging. There have been engines built with the supercharge compressor being engine-driven, electric motor driven, and wind-driven. Turbo (driving the supercharger off the exhaust gas stream) is just the currently popular way of doing it. "E", so far as I know, is just an archaic way of designating "Engine" before we had the current "O" for opposed and other minor variants. However, I am not absolutely sure on this one. Jim "jharper aaatttt cisco dddooottt com" "jharper aaatttt cisco dddooottt com" shared these priceless pearls of wisdom: -I know what *most* of the letters that show up in engine designators -mean (e.g. TSIO-540, AEIO-540), but there are two I can't figure -out and can't find any information about, viz S and E. They seem to show -up with T (turbo) and A (aerobatic/inverted) respectively, but that -do they actually mean? - -Thanks, - - John Jim Weir (A&P/IA, CFI, & other good alphabet soup) VP Eng RST Pres. Cyberchapter EAA Tech. Counselor http://www.rst-engr.com |
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"jharper aaatttt cisco dddooottt com" "jharper aaatttt cisco dddooottt
com" wrote in message news:1092845688.169721@sj-nntpcache-5... I know what *most* of the letters that show up in engine designators mean (e.g. TSIO-540, AEIO-540), but there are two I can't figure out and can't find any information about, viz S and E. They seem to show up with T (turbo) and A (aerobatic/inverted) respectively, but that do they actually mean? The "S" is actually part of "TS", which stands for "TurboSupercharged". I believe, but am not certain, that the "E" is similarly part of "AE", as in "AErobatic". Pete |
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"jharper wrote
I know what *most* of the letters that show up in engine designators mean (e.g. TSIO-540, AEIO-540), but there are two I can't figure out and can't find any information about, viz S and E. They seem to show up with T (turbo) and A (aerobatic/inverted) respectively, but that do they actually mean? Nomenclatura Lycoming's specific convention for post-WWII aircraft piston engine designation is as follows. Note that this convention is fairly standard and applicable to many other manufacturers. C-D-M Whe C Letters indicating the engine's configuration: I Fuel injected O Opposed type (pancake-style) X X-type engine R Radial type engine G Engine is geared T[S] Engine is turbocharged S Engine is supercharged, EXCEPT for most Continental TURBOcharged engines. These are designated "TS". See below. L Engine is liquid-cooled or left-turning (ugh!) A Engine is designed for aerobatics (DRY SUMP) AE Engine is designed for aerobatics (WET SUMP) M Engine is designed for unmanned drone H Engine is designed for helicopter installation V Engine is designed to have the crankshaft in the vertical, not horizontal, plane. D The engine's displacement in cubic inches. M The manufacturer's "data" - often indicating what types of accessories or engine revisions. Bob Moore |
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