12-20-2024 - Armstrong Siddeley Panther IIA: Part 2 – Auxiliary Section
12-18-2024 - Armstrong Siddeley Panther IIA: Part 1 – Power Section
12-01-2024 - Lycoming XR-7755 Development
    3 Mar 1944 — Study of Power Required per Cylinder
    11 Sep 1945 — Engine / Turbosupercharger Characteristics Comparison
    January 1946 — XR-7755 Contract Summary
    3 Dec 1946 — XR-7755 Performance on Various Fuels
12-01-2024 - AEHS Members 2024 Newsletter #4
11-19-2024 - 3 Dec 1946 — Lycoming XR-7755 Verification Test Reports
11-18-2024 - 15 Jul 1947 — Lycoming XR-7755 Development Direct Injection Calibration
    1 Oct 1947 — Fire in the Test Cell
    15 Oct 1947 — September 1947 Status Report
    29 Jan 1948 — Testing Schedule and Results
    18 Nov 1948 — The XR-7755 is Still Far from Reliable
11-14-2024 - 1 Dec 1946 — Lycoming XR-7755 Hours Run During 1946
11-13-2024 - Dec 1946 - Jan 1947 — Lycoming XR-7755 Performance Compared to Turboprops in Development
11-12-2024 - Book Review: L-15 Scout: Boeing's Smallest Airplane, by Mal Holcomb
11-08-2024 - Book Review: Westinghouse J34 Axial Turbojet Family: Development History and Technical Profiles, by Paul J. Christiansen
10-18-2024 - CAD Images by Stephen Stanley: Curtiss R-600 Challenger; Velie M-5
10-07-2024 - 1 Jan 1945 — Lycoming XR-7755 Engine Mount Studies
10-07-2024 - Lycoming XR-7755-1 Engine Specification No. 2020-C; Installation Drawing No. 80005; Power Curve No. 3985
10-02-2024 - Lycoming XR-7755: 19 Apr 1948 – First 50-hr Test at 5,000 hp
10-02-2024 - Lycoming XR-7733 Specifications, Installation Drawings and Power Curves:
    5 Jul 1943 — Lycoming X-6 Engine Specification No. 2020
    30 Jun 1944 — Lycoming X-7 Engine Preliminary Specification; Installation Drawing No. 80001
    4 Jun 1945 — Lycoming XR-7755-3 Engine Specification No. 2031-A; Installation Drawing No. 80004; Power Curve No. 5714
    29 Nov 1945 — Lycoming XR-7755-5 Engine Specification No. 2030-B; Installation Drawing No. 80006
    7 Feb 1955 — Military Specification MIL-E-25109, Engines, Aircraft, Reciprocation, General Specification For (supersedes AN-9500d dated 23 Sep 1948)
10-01-2024 - Wright P-1 CAD Model: Crankcase Rear Section, Oil System, by John Riend
10-01-2024 - The Lighter Than Air Era, by Sergio Pasquali (Italian Language)
09-27-2024 - Lycoming XR-7755 Article Update
09-07-2024 - Lycoming XR-7755 Article Update
09-05-2024 - Lycoming XR-7755 Article Update
09-04-2024 - Lycoming XR-7755 Article Update
09-03-2024 - Lycoming XR-7755 Article Update
09-01-2024 - AEHS Members 2024 Newsletter #3
08-31-2024 - Lycoming XR-7755 Article Update
08-30-2024 - Lycoming XR-7755 Article Update
08-27-2024 - Lycoming XR-7755 Article Update
08-24-2024 - Lycoming XR-7755 Article Update
08-20-2024 - Lycoming XR-7755 Article Update
08-09-2024 - Lycoming XR-7755 Article Update
08-07-2024 - Lycoming XR-7755 Article Update
08-03-2024 - Lycoming XR-7755 Article Update
08-01-2024 - The Lycoming XR-7755
07-11-2024 - The McKinnon Jet Goose (updated)
07-10-2024 - Curtiss-Wright Cyclone 22 (Military XR-4090)
07-01-2024 - Allison V-3420-9 Type Test
06-17-2024 - Stromberg NA-S4 Carburetor Development—Part 4: Testing on the Lawrance J-1
06-16-2024 - Stromberg NA-S4 Carburetor Development—Part 3: The Fixes
06-14-2024 - Programs for all AEHS Conventions Added (Members' Section)
06-07-2024 - YouTube video of Tom Fey’s OS FS-20 Running
06-06-2024 - Stromberg NA-S4 Carburetor Development—Part 2: Testing on the Lawrance L-4
06-05-2024 - Stromberg NA-S4 Carburetor Development—Part 1: Description
06-04-2024 - Wright J-5A 100-hour Full-Throttle Endurance Test
06-03-2024 - Wright J-4A Endurance Tests
06-02-2024 - Wright J-3 50-hour Test
06-01-2024 - AEHS Members 2024 Newsletter #2
05-22-2024 - Curtiss V-1400 R3C-2 Schneider Cup Racing Engine
05-15-2024 - Instructing in the T-6
05-14-2024 - The McKinnon Jet Goose
05-12-2024 - WWII Bomber Operations from a British Perspective
05-01-2024 - Wright P-1 CAD Model, Complete Assembly, Front Section, by John Riend
04-19-2024 - Wright P-1 CAD Model, Valve Train, by John Riend
04-16-2024 - Ad Astra per Aspera (To the Stars Through Hardships), by Terry Spath
04-12-2024 - U.S. Military Engine Development, updated with Lycoming XR-7755 and Studebaker XH-9350 data.
04-11-2024 - Wright P-1 CAD Model, Starter, by John Riend
04-09-2024 - U.S. Military Experimental Engine Development, 1935 – 1947
04-06-2024 - Tom Fey’s OS FS-20 Restoration
04-06-2024 - Wright P-1 CAD Model, Gear Trains, by John Riend
03-30-2024 - Wright P-1 CAD Model, Partial Assembly, by John Riend
03-27-2024 - Allison V-3420-A8R, AEC Serial Number 173 Restored
03-18-2024 - Wright P-1 CAD Model, Cylinder, by John Riend
03-07-2024 - Wright P-1 CAD Model, new castings added, by John Riend
03-05-2024 - NMUSAF Rocket Tour Docent Training, by Jeff Robeson (2.0M PDF)
03-04-2024 - NMUSAF Piston Engine Tour Docent Training, by Jeff Robeson (2.8M PDF)
03-01-2024 - Book Review: Building Engines for War by Edward M. Young
03-01-2024 - Wright P-1 CAD Model, by John Riend
03-01-2024 - AEHS Members 2024 Newsletter #1
02-23-2024 - The USAAF Compound Engine Project
02-13-2023 - Bonus Reno 2023 Gallery (Members Section)
02-10-2023 - Reno 2023
02-06-2024 - Wright R-2 Drawings (Members Section)
02-05-2024 - Additions to Wright P-2 CAD Model, by John Riend
02-01-2024 - It Sounded Like a Good Idea at the Time: Canadian Car and Foundry HI-4800 3,000 hp Diesel Oil Engine, Updated (Members Section)
01-30-2024 - A Wolseley Motor That "Never Was" – The Hispano-Suiza 'Viper' W-12 Aero-Engine, by Jerry Wells
01-28-2024 - New Features and Videos
01-28-2024 - Wright P-2 CAD Model, by John Riend
01-27-2024 - It Sounded Like a Good Idea at the Time: Canadian Car and Foundry HI-4800 3,000 hp Diesel Oil Engine (Members Section)
01-18-2024 - Book Review: The History of North American Small Gas Turbine Aircraft Engines
01-09-2024 - Book Review: Rolls-Royce and the Mustang
01-07-2024 - It Sounded Like a Good Idea at the Time: Variable Discharge Turbosupercharger Engine (VDT) (Members Section)
01-05-2024 - Additions to Wright J-5C CAD Model by John Riend
01-01-2024 - Kinner Aircraft Engines
01-01-2024 - Additions to Wright J-5C CAD Model by John Riend
12-16-2023 - It Sounded Like a Good Idea at the Time: Xylidine (Members Section)
12-14-2023 - It Sounded Like a Good Idea at the Time: Tetraethyl Lead (Members Section)
12-12-2023 - It Sounded Like a Good Idea at the Time: Spark Plugs (Members Section)
12-10-2023 - Additions to Wright J-5C CAD Model by John Riend
12-10-2023 - It Sounded Like a Good Idea at the Time: Packard Gas Turbines (Members Section)
12-08-2023 - It Sounded Like a Good Idea at the Time: Hard Alloy Propeller Blades (Members Section)
12-06-2023 - It Sounded Like a Good Idea at the Time: Bulova Fuel Injection Case History (Members Section)
12-05-2023 - It Sounded Like a Good Idea at the Time: Berylium Case History (Members Section)
12-04-2023 - General Electric GE4 Afterburner Test Rig
12-04-2023 - Turbosuperchargers for Experimental USSAC Aircraft, circa 1942 (Updated)
12-02-2023 - Wright J-5C CAD Model by John Riend
12-01-2023 - AEHS Members 2023 Newsletter #4
11-25 2023 - Another Water Injection Servicing Error
11-14-2023 - S.D. Stanley CAD Models: Curtiss Chieftain
11-12-2023 - Turbosuperchargers for Experimental USSAC Aircraft, circa 1942
11-11-2023 - Aircraft Engine Development circa 1923
11-06-2023 - The de Havilland H-1 as built in the U.S. by Allis-Chalmers
11-05-2023 - The U.S. Air Force Nuclear Aircraft Propulsion Program
11-05-2023 - Book Review: A Span of Wings, an autobiography by Sir Archibald Russell
10-31-2023 - Boeing Gas Turbines
10-23-2023 - The Northrop Turbodyne (XT37) Turboprop
10-06-2023 - Maintaining the Aeroproducts Model 606 Propellers, by Tony Vasko
09-09-2023 - The Aeroproducts Models A6441FN-606 and A6441FN-606A Propellers
09-08-2023 - Mysteries of the Convair B-36 Propeller: Part 1
09-03-2023 - Air-Cooled Engines: Post WWI Royal Aircraft Establishment Work (Members Section)
09-03-2023 - Allison Background, Products, Facilities (Members Section)
09-03-2023 - Hibner Rotary Gas Engine (Members Section)
09-03-2023 - Isotta Fraschini Gamma RC.35 Air-Cooled V-12 (Members Section)
09-03-2023 - Kemp Air-Cooled Aeroplane Motors (Members Section)
09-03-2023 - Rebuilding Curtiss OX Motors to Obtain Maximum Power and Reliability (Members Section)
09-03-2023 - Meccanica Verghera Agusta Aircraft Engines (Members Section)
09-03-2023 - Tampier L'Alimentation des Moteurs d'Aeroplanes 1913 (Blocktube Carburetor) (Members Section)
09-03-2023 - Tampier L'Alimentation des Moteurs d'Aeroplanes 1914 (Blocktube Carburetor) (Members Section)
09-03-2023 - Tampier L'Alimentation des Moteurs d'Aeroplanes 1916 (Blocktube Carburetor Repair Parts) (Members Section)
09-03-2023 - Wright Propeller-Speed Cooling Fan Service Instructions (Members Section)
09-01-2023 - The Lockheed L-188 Electra, Allison 501 Engine and Aeroproducts Propeller
09-01-2023 - AEHS Members 2023 Newsletter #3
08-28-2023 - General Electric J47 Images
08-28-2023 - Early Engines: Wright Aeronautical Corporation
08-20-2023 - Restoring an Aeroproducts Hollow Steel Turbopropeller Blade
08-14-2023 - Early Engines: Winterthur
08-14-2023 - Early Engines: Wolseley
08-14-2023 - Early Engines: Wright Brothers
08-08-2023 - Early Engines: Western
08-08-2023 - Early Engines: Werner & Pfleiderer
08-08-2023 - Early Engines: Wells-Adams
08-07-2023 - Wings of History Air Museum engines added to AEHS List of Engines in Museums
08-06-2023 - Early Engines: Warner
07-24-2023 - Early Engines: Walter
07-10-2023 - Early Engines: Willis-DePalma
06-29-2023 - Early Engines: Vivinus
06-29-2023 - Early Engines: Viking
06-29-2023 - Early Engines: Universal Test Engine
06-27-2023 - Early Engines: Union
06-26-2023 - Early Engines: Trebert
06-19-2023 - Early Engines: Tosi
06-17-2023 - Wright L-320 Gipsy Engine Assembly CAD Models
06-14-2023 - Early Engines: Tips
06-08-2023 - Wright L-320 Gipsy Valve Train Assembly CAD Models
06-06-2023 - Wright L-320 Gipsy Lower Crankcase Studding Assembly CAD Models
06-05-2023 - Wright L-320 Gipsy Upper Crankcase Studding Assembly CAD Models
06-04-2023 - Early Engines: Thomas
06-01-2023 - AEHS Members 2023 Newsletter #2
05-29-2023 - Early Engines: Sunbeam
05-24-2023 - Wright L-320 Gipsy Crankcase, Upper CAD Models
05-19-2023 - Wright L-320 Gipsy Manifolds, Oil Pump, Prop Hub CAD Models
05-17-2023 - Wright L-320 Gipsy Cylinder and Head CAD Models
05-15-2023 - ID Unknown: Conner Radial
05-14 2023 - Accidents Due to Water Injection Servicing Errors
05-14-2023 - Wright L-320 Gipsy CAD Model
05-10-2023 - Early Engines: Sturtevant
05-08-2023 - Early Engines: S.P.A.
05-05-2023 - Early Engines: Smith
05-02-2023 - Early Engines: Siemens-Halske
04-30-2023 - Early Engines: Siddeley-Deasy
04-29-2023 - Early Engines: S.H.K.
04-28-2023 - Early Engines: Sauda
04-27-2023 - Early Engines: Salmson
04-23-2023 - Wright L-320 Gipsy Parts Catalog
04-13-2023 - Early Engines: Rolls-Royce
04-06-2023 - Early Engines: Roberts
04-06-2023 - Early Engines: Rheinische
04-04-2023 - Early Engines: R.E.P.
04-01-2023 - Early Engines: Renault
03-12-2023 - Early Engines: Renard
03-10-2023 - Some Notes on the Bristol Cherub and its Inner Works
03-07-2023 - Early Engines: Rausenberger
03-04-2023 - Early Engines: Rapp
03-01-2023 - AEHS Members 2023 Newsletter #1
02-20-2023 - Early Engines: R.A.F.
02-19-2023 - Technical Publication and Information Index, 1 Apr 1943 (Members' Section)
02-19-2023 - Technical Publication and Information Index, 1 Jun 1943 (Members' Section)
02-19-2023 - Technical Publication and Information Index, 1 Apr 1945 (Members' Section)
02-19-2023 - Technical Publication and Information Index Supplement, 14 Apr 1945 (Members' Section)
02-19-2023 - Technical Publication and Information Index Supplement, 1 May 1945 (Members' Section)
02-19-2023 - Technical Publication Alphabetical Index, 15 Jun 1945 (Members' Section)
02-19-2023 - Technical Publication and Information Index, 1 Oct 1946 (Members' Section)
02-19-2023 - Technical Orders Explanation, 1946 (Members' Section)
02-12-2023 - Curtiss R-600 Challenger CAD Model: PN C-10126 Cam Drive Geartrain
02-11-2023 - Allison V-1710-81, -87 Parts Catalog (Members' Section)
02-08-2023 - Early Engines: Pipe
02-08-2023 - Early Engines: Potez
02-08-2023 - Early Engines: Prini-Berthaud
02-08-2023 - Early Engines: Pratt & Whitney
02-06-2023 - Early Engines: New Irwin Engine Drawings
02-02-2023 - Early Engines: Peugeot
02-01-2023 - S.D. Stanley CAD Models: Hall-Scott A7A, Wright J-5
02-01-2023 - Curtiss Wright Turbo Compound Data Plate Sampling, by Carl Kuhns
02-01-2023 - Early Engines: Packard 02-01-2023 - Early Engines: Panhard
01-24-2023 - Early Engines: Oberursel
01-24-2023 - Early Engines: Oerlikon
01-24-2023 - Early Engines: Opel
01-24-2023 - Early Engines: Orlo
01-24-2023 - Early Engines: Otto
01-21-2023 - Early Engines: Novus
01-20-2023 - New Links
01-17-2023 - Curtiss R-600 Challenger CAD Model: PN C-10225EXP Cam Drive Geartrain
01-19-2023 - Early Engines: N.E.C.
01-17-2023 - Curtiss R-600 Challenger CAD Model: PN C-10225ABC Cam Drive Geartrain
01-17-2023 - Reno 2022
01-15-2023 - Early Engines: Napier
01-14-2023 - Early Engines: N.A.G.
01-09-2023 - Propeller Indexing
01-07-2023 - P & W R-4360 Engine Exploded Views (Members' Section)
01-07-2023 - Wright R-3350 Engine Exploded Views (Members' Section)
12-29-2022 - Manned U.S. Rocket Propulsion – Part 9.50: The Apollo Guidance Computer
12-09-2022 - Manned U.S. Rocket Propulsion – Part 9.46: Apollo Lunar Module Guidance and Control
12-07-2022 - F-1 Rocket Engine Combustion Instability Fix
12-01-2022 - Manned U.S. Rocket Propulsion – Part 9.21: Apollo Command Module Guidance and Control
12-01-2022 - AEHS Members 2022 Newsletter #4
11-27-2022 - Curtiss R-600 Challenger CAD Model: PN C-10225B and PN C-10225C Cam Gear Assemblies
11-25-2022 - Curtiss R-600 Challenger CAD Model: PN C-10225A Cam Gear Assembly
11-24-2022 - Curtiss R-600 Challenger CAD Model: PN C-10126 Cam Gear Assembly
11-22-2022 - Curtiss R-600 Challenger CAD Model: PN C-10839 Crankshaft
11-22-2022 - Curtiss R-600 Challenger CAD Model: PN C-10787 Crankshaft
11-20-2022 - Wright R-3350 Turbo Compound Power Recovery Turbine Fluid Couplings
11-15-2022 - Curtiss R-600 Challenger CAD Model: PN C-10369 Crankshaft
11-13-2022 - Curtiss R-600 Challenger CAD Model: PN C-10102 Crankshaft
11-07-2022 - Curtiss R-600 Challenger CAD Model: PN C-10608 Master Rods
11-04-2022 - Curtiss R-600 Challenger CAD Model: PN C-10785 Master Rods
11-03-2022 - Early Engines: Murray-Willat
11-03-2022 - Early Engines: Morehouse
11-03-2022 - Early Engines: Minerva
11-03-2022 - Early Engines: Miller
11-03-2022 - Early Engines: Michigan Aero
11-03-2022 - Early Engines: Michel
11-02-2022 - Distributors for the Rolls-Royce Heritage Trust, Allison Branch Liberty L-12A
11-02-2022 - Early Engines: Mercedes
10-31-2022 - Curtiss R-600 Challenger CAD Model: PN C-10039 Master Rods
10-21-2022 - Early Engines: Maybach
10-17-2022 - Early Engines: Maximotor
10-17-2022 - Early Engines: Manly
10-13-2022 - Early Engines: Liberty
09-30-2022 - Early Engines: Le Rhône
09-20-2022 - General Electric F110 Turbine Blade Details
09-20-2022 - Curtiss R-600 Challenger CAD Model: Lanchester Damper
09-19-2022 - Early Engines: Lorraine-Dietrich
09-19-2022 - Early Engines: Lawrance
09-03-2022 - Curtiss R-600 Challenger CAD Model: Final Production Oil Pump
09-07-2022 - Pratt & Whitney R-4360 C-Series Ignition System Map
09-07-2022 - Curtiss R-600 Challenger CAD Model: First Production Oil Pump
09-06-2022 - Curtiss R-600 Challenger CAD Model: Experimental Oil Pump
09-03-2022 - Curtiss R-600 Challenger CAD Model: Experimental Oil Cooler
09-01-2022 - Pobjoy Cascade II
09-01-2022 - AEHS Members 2022 Newsletter #3
08-29-2022 - P&W J58 Overview
08-18-2022 - Early Engines: New Irwin Engine Drawings
08-10-2022 - General Electric Jet Propulsion circa 1979 (Members Section)
08-09-2022 - General Electric Jet Propulsion circa 1983 (Members Section)
08-08-2022 - Early Engines: Körting
08-08-2022 - Early Engines: Knox
08-06-2022 - Early Engines: Kirkham
08-06-2022 - Early Engines: King
08-04-2022 - Early Engines: Kessler
08-04-2022 - Early Engines: Kemp
08-01-2022 - Early Engines: Junkers
07-21-2022 - Tom Fey’s Righter 4-O-34 Restoration Part 3
07-20-2022 - Tom Fey’s Righter 4-O-34 Restoration Part 2
07-19-2022 - Early Engines: Issoto-Fraschini
07-18-2022 - Early Engines: Isaacson
07-18-2022 - Early Engines: Irwin
07-13-2022 - Early Engines: Indian
07-11-2022 - Early Engines: Hispano-Suiza
07-08-2022 - R-1830 Foundry Pattern and Die Work at Buick
07-08-2022 - R-1830 Machining and Assembly, Buick, Melrose, Illinois
07-07-2022 - Wright Duplex Cyclone R-3350 (972TC18DA) Performance Data (Members Section)
07-07-2022 - Wright Duplex Cyclone R-3350 (988TC18EA) Performance Data (Members Section)
07-07-2022 - R-1830 Cylinder Head Manufacture at Buick
07-01-2022 - Early Engines: Hiero
06-30-2022 - Metropolitan Vickers, the Gas Turbine, and the State: A Socio-Technical History, 1935-1960, by Jakob Whitfield
06-30-2022 - Pratt & Whitney R-1830 Engine Manufacture at Buick
06-30-2022 - Pratt & Whitney R-1830 Reduction Gear Manufacture at Buick
06-30-2022 - Early Engines: Harriman
06-30-2022 - Early Engines: Hansen & Snow
06-30-2022 - Early Engines: Heath-Henderson
06-23-2022 - Early Engines: Hall-Scott
06-16-2022 - Early Engines: Gyro
06-15-2022 - Early Engines: Green
06-13-2022 - Early Engines: Gnome-Rhone
06-13-2022 - Early Engines: Gnome
06-11-2022 - Early Engines: Galloway
06-07-2022 - Early Engines: Fox
06-07-2022 - Early Engines: Fiat
06-01-2022 - AEHS Members 2022 Newsletter #2
05-31-2022 - Early Engines: Farman
05-30-2022 - Early Engines: Farina
05-28-2022 - Early Engines: Farcot
05-28-2022 - Early Engines: Fairchild
05-14-2022 - Early Engines: E.N.V.
05-14-2022 - Early Engines: Engineering Division
05-11-2022 - Early Engines: Elbridge
05-08-2022 - Early Engines: Duesenberg
05-08-2022 - Early Engines: Duthiel-Chalmers
05-07-2022 - Early Engines: Detroit Aero
05-07-2022 - Early Engines: Dodge
05-06-2022 - Early Engines: Darracq
05-06-2022 - Early Engines: De Dion
05-04-2022 - Museum Flugausstellung Peter Junior
05-01-2022 - Early Engines: Bristol
04-26-2022 - Early Engines: Curtiss
04-18-2022 - Early Engines: Cosmos
04-12-2022 - Early Engines: Clerget
04-06-2022 - Early Engines: Cirrus
03-30-2022 - Early Engines: Bugatti
03-30-2022 - Early Engines: BMW
03-27-2021 - Technik Museum Speyer
03-24-2022 - Early Engines: Benz
03-19-2022 - Technik Museum Sinsheim
03-17-2022 - Early Engines: Bentley
03-11-2022 - Early Engines: Beardmore
03-10-2022 - Tom Fey’s Righter 4-O-34 Restoration Part 1
03-07-2022 - The Vortex and the Jet by Reiner Decher
03-05-2022 - Early Engines: Argus
03-01-2022 - AEHS Members 2022 Newsletter #1
02-28-2022 - Early Engines: Anzani
02-26-2022 - Early Engines: Antoinette
02-24-2022 - Early Engines: Ansaldo
02-22-2022 - Early Engines: Aeromarine
02-17-2022 - Early Engines: Adams-Farwell
02-17-2022 - Reno 2021 Photo Gallery (Members Section)
02-15-2022 - Early Engines: A.B.C.
02-09-2022 - Reno 2021
02-04-2022 - Mounting Troubles by Lee S. Langston
02-04-2022 - Powering Out of Troubles by Lee S. Langston
02-04-2022 - Single-Crystal Turbine Blades Earn ASME Milestone Status by Lee S. Langston
01-29-2022 - The Lockheed L-1000 (XJ37) Turbojet
01-01-2022 - Search AEHS Document Collection for 'Aviation Fuels' scan by Tom Fey (Members Section)
10-06-2020 - U.S. WWII Engine Production
10-06-2020 - U.S. WWII Propeller Production
10-01-2020 - Turbosupercharger Control Systems: Part 1 — Oil Pressure Powered
10-01-2020 - Turbosupercharger Control Systems: Part 2 — Electronic
10-01-2021 - Manned U.S. Rocket Propulsion – V-2 to Moon Landing
08-17-2019 - U.S. Military Aircraft Manual Index
08-16-2019 - U.S. Military Engine Manual Index
11-13-2018 - Studebaker XH-9350 Aircraft Engine
11-04-2018 - A German Assessment of the Allison V-1710 Aircraft Engine
09-01-2018 - Packard-Built V-1650, Rolls-Royce Merlin XXVII Engineering Information
07-09-2018 - WWI-Era Engine Reports and Power Curves, 1917 (Members Section)
07-07-2018 - Air Board Engine Book (Members Section)
07-04-2018 - WWI Engine Power Curves, 1917 (Members Section)
07-04-2018 - Jacobs L-4, L-5, L-6 Series Specifications, Data, Installation Drawings (Members Section)
05-24-2018 - Propeller Shaft Dimensions
05-12-2018 - More Jacobs Aircraft Engine History
05-01-2018 - Request for Data R40-A Engine Evaluation (P&W X-1800, Wright R-2160, Continental XH-2860, Allison V-3420 competition.)
05-01-2018 - Junkers Jumo 004 Technical Description
01-31-2018 - Pratt & Whitney R-4360 Valve Train Development
01-03-2018 - Evaporative Cooling, Part 1: Through WWII
01-03-2018 - Evaporative Cooling, Part 2: Post WWII
12-01-2017 - Wright TC18EA Cutaways and Schematics (Members Section)
12-01-2017 - Wright Turbo Compound Power Recovery Turbine Removal and Disassembly (Members Section)
11-24-2017 - Wright Cyclone Power Measurement (Members Section)
11-23-2017 - Wright Student Notebook: 2. Power Curves (Members Section)
11-23-2017 - Wright Student Notebook: 7. The Wright Torque Indicator (Members Section)
11-09-2017 - Propeller and Governor Application List (Members Section)
09-22-2017 - The Evolution of Crankshaft Design in High Output In-Line Aircraft Piston Engines --- by Robert J. Raymond
06-19-2017 - WWII Gunnery Target Engine Technical Analysis:
  Part 1. Background and General Configuration
  Part 2. The Righter 2-GS-17 (O-15-1) in Detail
  Part 3. The Righter O-15-3 Engine
  Part 4. Performance and Efficiency Comparison between O-15-1 and O-15-3 Engines
  Part 5. The O-45-1 and Kiekhaefer O-45-35
  Part 6. Performance and Efficiency Comparison between O-45-1 and O-45-35 Engines
  Part 7. Conclusion
06-07-2017 - Hamilton Standard Propellers (Members Section)
04-19-2017 - U.S. Reciprocating Aircraft Engine General Specifications and Testing (AN-9500D, AN-9502D) (Members Section)
06-21-2016 - Allison V-1710 and Rolls-Royce Merlin Torsional Vibration Characteristics (1.3M PDF) --- by Robert J. Raymond and Daniel D. Whitney
12-21-2015 - Engine Approved Type Certificate List, Nos. 1 ~ 218, 1928 through 1939 (4.5M PDF)
12-12-2015 - U.S. Navy Aeronautical Engine Laboratory Report Index, by Paul Christiansen
06-02-2014 - U.S. National Archives I Navy Bureau of Aeronautics Index
05-13-2014 - An Analysis of the Contra-Rotating Propellers on the 1943 Radioplane OQ-2 Gunnery Target Drone, by Tom Fey
03-19-2014 - Ford's Aircraft Engine (Members Section)
08-17-2013 - Aircraft Carburetors and Fuel Systems
02-18-2013 - The Packard Variable Speed Drive, by Jerry Wells
09-10-2012 - AEHS Document Collection Catalog (Members Version with Access to Numerous Engine Accessory Manuals)
09-05-2012 - Triptane --- the Super Fuel (Members Section)
11-13-2011 - Napier Sabre Overhaul (Members Section) Public Preview of Napier Sabre Service and Overhaul Tools
10-09-2011 - Correct Designations for Jet, Turboprop, Pulse Jet, Ram Jet and Rocket Engines   (No dash between J, T, PJ, RJ, R and number after 15 May 1945)
09-09-2011 - Installation Drawings for 25 Aircraft Engines from 1924
07-23-2011 - Characteristics of Fuels
07-21-2011 - BMW 801 D-2 Kommandogerät (Control System) (Members Section)
07-01-2011 - Merlin vs Allison: Aircraft Engine Performance Analysis at Rolls-Royce, ca 1940 --- by Robert J. Raymond (web version)
05-28-2011 - Merlin vs Allison: Aircraft Engine Performance Analysis at Rolls-Royce, ca 1940 --- by Robert J. Raymond
04-30-2010 - A-12 / SR-71 Propulsion, A Photo Essay by Richard E. Loftis (Members Section)
04-24-2010 - Manufacturing the Napier Sabre (Members Section)
04-14-2010 - Manufacturing the Packard-Built Merlin (Members Section)
04-11-2010 - Manufacturing the Allison V-1710 (Members Section)
02-21-2010 - Manufacturing the Rolls-Royce Merlin (Members Section)
11-15-2009 - The Westinghouse Aviation Gas Turbine Division 1950-1960
08-22-2009 - How Many Valves?, by Kevin Cameron  (History of Number of Valves per Cylinder (Members Section)
08-22-2009 - The Engines of Brodhead, a Photo Essay by Richard E. Loftis (Members Section)
05-21-2008 - Indexes for over 550,000 Air Force Documents
02-06-2006 - Index to Navy ADI(k) Microfilms of German Documents
10-28-2004 - USAF Case History Files Index

... Plus much, much more that is older than two years.
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