To make use of the aircraft listings, you must of course understand the aircraft designations. I havelinks to several sites explaining and listing aircraft designations. I think, the most useful general purpose source for finding some details about an aircraft given its designation isAndrew Chorney's site.
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The Army and Air Force used oddnumbers from 1 up, while the Navy used even numbers from 2 up. The Air Force was assigned model numbers to , the Navy to and the Army to Lettersare assigned alphabetically from A on I and O are not used. The letter W is reserved for engines with water injection. T could be combined with other letters, e.
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However,I don't know any case, where this occured for contemporaryengines, so this did not pose problems in 'real life'. It is also possible, that the displacement was sometimes rounded to the next 10 cubic inches to get differentdesignations for engines with similar displacement. Note:While this system was theoretically revised by MIL-STD,it is - to all intents and purposes - still in use today, mainly because of two reasons:Existing engines are not redesignated and there is no new piston engine development specifically for the military. Many manufacturers of commercial engines e.
Lycoming and Continental designate their engines according to the'arrangement-displacement' system, which makes it very convenient for the military to use these commercial designations,when such an engine is procured. The Curtiss Chieftain engine was of a unique configuration, and was originally classed as a 'hexagonal' engine - hencethe 'H' prefix. It was later redesignated as the R radial engine. Note that there is no dash between the engine type letter and the modelnumber. The Army and Air Force used odd numbers from 31 up, while the Navy usedeven numbers from 30 up.
Why each numerical sequence was started at 30, I don't know. The following is a list of all assignedcode letters, not all of which were actually used for jet engines: A - Allison Div. AH - American Helicopter Div. AM - Aeromarine Co. AN - Aeronutronics Corp. B - Buick Motor Div. BL - Bridgeport-Lycoming Div. C - Chevrolet Div. D - Chrysler Corp. E - Aircooled Motors, Inc. F - Ford Motor Co. FF - Frederic Flader, Inc.
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G - Warner Aircraft Corp. G - Garrett Corp. J - Jacobs Aircraft Engine Co. Kellogg, Inc. MA - Marquardt Aircraft Co. MN - Menasco Manufacturing Co.
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NH - Northrop Aircraft, Inc. RM - Reaction Motors, Inc. RP - Radioplane Div. S - Solar Aircraft Co.
ST - Studebaker Corp. T - Continental Motors Corp.
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WE - Westinghouse Electric Corp. WS - West Engineering Co. The same code letters were used in serial numbers for all types of engines, including pistonand rocket engines. This explains why code letters were also assigned to companies which never developed ormanufactured jet or turbine engines. The number 4 designates a specific model of the engine. The Army and Air Force use oddnumbers from 1 up, while the Navy uses even numbers from 2 up.
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The letter W is reserved for engines with water injection, whilethe combination 'WA' is used for engines with water-alcohol injection. I don't know for sure, whether the LJ95 really fits into the J-sequence, butconsidering the high number making a separate LJ-series unlikely and the fact, that J95 would be missing otherwise, Irisk a guess.
It seems, that only the basic PT6 engine is designated as T Many aircraft use the PT6A version, which isalways exception: T for C, see below listed as such in officialmilitary documents and data sheets. The system the familiar 'LR' designations has gone through all this essentially unchanged and is discussed insection 5. The only difference in the original system was, that odd model numbers were reserved for theAir Force and Army, while the Navy used only even model numbers.
This is similar to early jet engine designations,except that for liquid rockets, the sequence started at 1 instead of This designation system was abandoned in the 's. The two-letter code 2 indicates the type of propellant. Note: There are no dashes and blanks between the three elements of the designation. This standard combined several equipment designation systems,which shared common definitions and procedures, into a single document.
Included were the type designation systems forall aerospace engines.
The change from 'Standard' to 'Handbook'means, that the use of the designation systems is no longer mandatory. This finally 'legalizes' the long standingpractice of using manufacturers' designations for commercial equipment procured 'off the shelf'. The engine type designators and model numbering methods were just revised a little bit. Piston engines, however, are no longer supposed to use the displacement-based designations, but this seems to be a purelytheoretical change, becauseno new piston engines are developed specifically for the military market and new commercial piston engines are operated withtheir manufacturers' designations.
The latter is probably done, because the major American manufacturers of modern pistonengines give their engines designations closely following the original 'arrangement-displacement' system.
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The Air Force uses model numbers to , the Navy uses to and the Army uses to The numbers are assigned in numerical sequence separately by each service. The T designation for the engine of the Army's RAH Comanche is therefore not strictly conforming to the system,because the Army apparently started a new sequence at Instead, it should have been designated T or whatever the next available number was. But - as I said in the initial paragraph of this chapter -such deviations are actually allowed nowadays.
A few three-letter codes are assigned to non-US manufacturersor joint-venture companies.
The following is a list of all assigned code letters the same letters are used for rocket engine designations : AB - Allegany Ballistics Lab. AD - Allison Div. AJ - Aerojet General Corp. AR - Atlantic Research Corp.