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"Seeing the future by searching the past — Securing the future by saving the past" -- Alex Pong
The Aircraft Engine Historical Society is a non-profit educational and historical society that fosters an appreciation of the people, art, and science associated with aircraft engine development, manufacture, and use.

Features

Rolls-Royce Merlin Induction
Aircraft Engine Performance Analysis
at Rolls-Royce ca. 1940
by Robert J. Raymond

Engine testing and performance modeling to quantify engine and supercharger air flow characteristics in support of Rolls-Royce Merlin development began in the late 1930s. The status of this work was summarized in an internal Rolls-Royce Report in March, 1941 and made public by the Rolls-Royce Heritage Trust in 1997. This paper introduces a generalized method of predicting and comparing aircraft engine performance under flight conditions. Information in the Rolls-Royce Report is analyzed in this generalized manner, allowing comparison of Merlin and Allison V-1710 performance, which helps validate the method.

 
FW190 Engine Start
Restored FW190 First Engine Start

After years of restoration of his FW190 by an AEHS Legacy Member, this is the first start of its Ash82T engine.

 

Torque Meter V1N1

Torque Meter

Journal of the Aircraft Engine Historical Society

For seven years the AEHS published a prestigious quarterly journal, Torque Meter, which contained articles on all types of aircraft engines, both new and old. Topics included engines and the aircraft they powered with emphasis on the engine installation, propellers, accessories, cooling, operation, and maintenance.

Torque Meter is no longer published. However,

All Torque Meter Back Issues Are Still Available!

 
Torque Meter V7N4

Searchable Torque Meter Table of Contents Volumes 1-7 (2002-2008) (488 K PDF)
Compiled by Jim Strobeck

Searchable Torque Meter Alphabetic Feature and Column Index (106 K PDF)
Compiled by Sandy Skinner

Most new articles are now published in the Members' Section

AEHS Members also have access to the Members' Bulletin Board

Join AEHS Now!

 


Help Needed

Rolls-Royce Merlin Book

The Rolls-Royce Heritage Trust is putting together a book about the Merlin engine. We would like to include a list of surviving engines, and to this end any help would be appreciated.

All that is required is the mark and serial number of the engine, be it airworthy, on display, in a museum aircraft or in private ownership. Engines must be complete or substantially complete - no wrecks. All marks are eligible for engines made in the UK, USA and Australia.

We hope to collect serial numbers of all Packard Merlins, including the -3, -7 and -9s, etc., in Mustangs/museums/privately owned (even those built by Continental). Any such knowledge about Merlins other than those in USA/Canada would also be helpful.

If anyone would like to provide me with such details they can e-mail me through E-mail address

Dave Birch, Rolls-Royce Heritage Trust


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The AEHS Needs Your Help!

Please help the Aircraft Engine Historical Society achieve its mission. We need donations (click here to donate) and we need material for publication on this web site. If you wish to contribute material, you can find submission guidelines here. Please feel free to contact us about your article ideas.


Webmasters: Please feel free to link to this page of the AEHS site. Other pages may change and should not be linked.


Change History Listed below is everything that has been added to the AEHS web site for the past two years plus selected earlier additions.
All are in reverse chronological order.
Use this to see what has been added since your last visit, or use your browser's search feature to find specific keywords.

11-29-2016 - AEHS December 2016 Calendar
11-28-2016 - Chevrolet Aircraft Engines
11-28-2016 - Chevrolair Model D-4, D-6 Booklet (Members Section)
11-28-2016 - Chevrolet Model D-333 Brochure (Members Section)
11-28-2016 - Chevrolet-333 Booklet (Members Section)
11-28-2016 - Martin 333 Booklet (Members Section)
11-28-2016 - Martin 333 Techical Description and Cylinder Design Notes (Members Section)
11-26-2016 - Book Review: Westinghouse J46 Axial Turbojet Family
11-24-2016 - Menasco Aircraft Engines
11-24-2016 - Menasco Aircraft Engines and Their Air Racing Heritage, Part 1
11-24-2016 - Menasco Aircraft Engines and Their Air Racing Heritage, Part 2
11-24-2016 - Menasco Model B6S "Buccaneer" Engine Handbook (Members Section)
11-24-2016 - Menasco B-6 160 HP Buccaneer Brochure (Members Section)
11-24-2016 - Menasco B6 160 HP Buccaneer Brochure (Members Section)
11-24-2016 - Menasco B6S 200 HP Buccaneer Brochure (Members Section)
11-20-2016 - AEHS 2016 Convention Images: NMUSAF Aircraft and Engines, by Tom Fey (Members Section)
11-17-2016 - AEHS 2016 Convention Images: NMUSAF Restoration and Storage Facility (Members Section)
11-11-2016 - AEHS 2016 Convention Images: NMUSAF Engines (Members Section)
10-31-2016 - AEHS November 2016 Calendar
10-20-2016 - AEHS 2016 Convention Presentations (Members Section)
10-18-2016 - AEHS 2016 Convention Coverage
10-11-2016 - ASIC No. 380: Air Service Technical Bulletin (Formerly Technical Orders) No. 30 (Members Section)
10-11-2016 - ASIC No. 379: Air Service Technical Bulletin (Formerly Technical Orders) No. 29 (Members Section)
10-11-2016 - ASIC No. 378: Air Service Technical Bulletin (Formerly Technical Orders) No. 28 (Members Section)
10-11-2016 - ASIC No. 377: Air Service Technical Orders No. 27 (Members Section)
10-11-2016 - ASIC No. 351: Air Service Technical Orders No. 26 (Members Section)
10-06-2016 - Air Service Technical Orders No. 17 (Members Section)
10-06-2016 - Air Service Technical Orders No. 16 (Members Section)
10-06-2016 - Air Service Technical Orders No. 15 (Members Section)
10-06-2016 - Air Service Technical Orders No. 14 (Members Section)
10-06-2016 - Air Service Technical Orders No. 13 (Members Section)
10-05-2016 - Air Service Technical Orders No. 12 (Members Section)
10-05-2016 - Air Service Technical Orders No. 11 (Members Section)
10-05-2016 - Air Service Technical Orders No. 10 (Members Section)
10-05-2016 - Air Service Technical Orders No. 9 (Members Section)
10-05-2016 - Air Service Technical Orders No. 8 (Members Section)
10-05-2016 - Air Service Technical Orders No. 7 (Members Section)
10-04-2016 - Air Service Technical Orders No. 6 (Members Section)
10-04-2016 - Air Service Technical Orders No. 5 (Members Section)
10-04-2016 - Air Service Technical Orders No. 4 (Members Section)
10-04-2016 - Air Service Technical Orders No. 3 (Members Section)
10-04-2016 - Air Service Technical Orders No. 2 (Members Section)
10-04-2016 - Air Service Technical Orders No. 1 (Members Section)
10-01-2016 - AEHS October 2016 Calendar
09-16-2016 - New Dataplate Images by Cameron Jenkins
09-08-2016 - ASIC No. 682: Indicator Study of SV-1570 Engine (Members Section)
09-08-2016 - ASIC No. 670: The Difficulties of Prestone Cooling at 300° F Outlet Temperature (Members Section)
09-08-2016 - ASIC No. 648: Instructions for Assembly of Detachable Blade Propellers (Members Section)
09-08-2016 - ASIC No. 638: Test of Liberty 12 Engine with Various Piston Rings and Arrangements (Members Section)
09-08-2016 - ASIC No. 630: Dynamometer Carburetion Runs on Curtiss GV-1570 Engines (Members Section)
09-08-2016 - ASIC No. 611: Aircraft Ignition, Recent Developments (Members Section)
09-07-2016 - ASIC No. 596: Fire Hazard Tests of Ignition Equipment (Members Section)
09-07-2016 - ASIC No. 595: Comparison of Wood Propeller Wind Tunnel and Flight Tests (Members Section)
09-07-2016 - ASIC No. 594: Exhaust Equipment Temperature Determinations (Members Section)
09-07-2016 - ASIC No. 589: Power Plant Laboratory Standard Test Methods and Computation (Members Section)
09-06-2016 - ASIC No. 576: Air Service Technical Bulletin No 50 (Members Section)
09-06-2016 - ASIC No. 575: Air Service Technical Bulletin No 49 (Members Section)
09-06-2016 - ASIC No. 572: Development and Test of Stromberg NA-Y5D Carburetor for Curtiss D-12 Engine (Members Section)
09-06-2016 - ASIC No. 570: Development and Test of Zenith ED-52 Carburetor for Liberty 12 Engine (Members Section)
09-06-2016 - ASIC No. 551: First 50-Hour Test of the Air Cooled Liberty Engine (Members Section)
09-05-2016 - ASIC No. 550: Standard Engine Tests of Curtiss D-12 High and Low Compression Engines (Members Section)
09-05-2016 - ASIC No. 525: Piston Side Thrust in the Modified R-1 and Single Cylinder Test Engine (Members Section)
09-05-2016 - ASIC No. 523: Endurance Test of Liberty Engine with Various Experimental Materials (Members Section)
09-05-2016 - ASIC No. 505: Computing the HP Available from Engines with Two-Bladed Propellers (Members Section)
09-05-2016 - ASIC No. 504: Instructions for Reinforcing Liberty Cylinders (Members Section)
09-04-2016 - ASIC No. 350: Air Service Technical Orders No 25 (Members Section)
09-04-2016 - ASIC No. 349: Air Service Technical Orders No 24 (Members Section)
09-04-2016 - ASIC No. 348: Air Service Technical Orders No 23 (Members Section)
09-03-2016 - ASIC No. 337: Air Service Technical Orders No 22 (Members Section)
09-03-2016 - ASIC No. 333: Test of 300 HP Hispano-Suiza Model H Engine Fitted with 6.5:1 Compression Ratio Pistons (Members Section)
09-03-2016 - ASIC No. 309: Stromberg Type NA-D6 Carburetor Fuel-Consumptionon Improvement (Members Section)
09-02-2016 - ASIC No. 284: Packard Model 1A-1116 Performance with 6.5:1 Compression Ratio (Members Section)
09-02-2016 - ASIC No. 281: The Sylphon Fuel Pump for Liberty 12 and Wright Model H Engines (Members Section)
09-02-2016 - ASIC No. 279: Fifty-hour Endurance Test of Hispano-Suiza Model H with Cracked Crankcase (Members Section)
09-02-2016 - ASIC No. 257: Instructions to Pilots for the use of Mixture Controls (Members Section)
09-02-2016 - ASIC No. 223: Induction System Pressures in Liberty 12 and 300 HP Hispano-Suiza Engines (Members Section)
09-02-2016 - ASIC No. 218: Report on the Performance of the 5.5-inch by 6.5-inch Smith Cylinder Unit (Members Section)
09-01-2016 - ASIC No. 199: Test of a Standard Liberty Cylinder Mounted on a Universal Engine Crankcase (Members Section)
09-01-2016 - ASIC No. 192: Ten-Hour Endurance Test of Lawrance All-Aluminum Cylinder (Members Section)
09-01-2016 - ASIC No. 190: Test of Odier Portable Engine Starter (Members Section)
08-25-2016 - AEHS September 2016 Calendar
08-21-2016 - ASIC No. 179: Report of Wind-Tunnel Test of the Effect of Rake Angle on Suction in Exhaust Stubs (Members Section)
08-21-2016 - ASIC No. 175: Instructions for Installing 85-A Mixture Control in Zenith US-52 Carburetors (Members Section)
08-21-2016 - ASIC No. 170: Fifty-Hour High Speed Endurance Test of 300 HP Hispano-Suiza (Members Section)
08-20-2016 - ASIC No. 168: Test of Lucas Electric Engine Starter (Members Section)
08-20-2016 - ASIC No. 163: Air Service Technical Orders No 21 (Members Section)
08-20-2016 - ASIC No. 162: Air Service Technical Orders No 20 (Members Section)
08-20-2016 - ASIC No. 161: Air Service Technical Orders No 19 (Members Section)
08-20-2016 - ASIC No. 160: Air Service Technical Orders No 18 (Members Section)
08-19-2016 - ASIC No. 151: Delco Automatic Generator Cut-Out (Members Section)
08-19-2016 - ASIC No. 145: Investigation of Steel Propeller X-14849 (Members Section)
08-18-2016 - ASIC No. 138: 185 HP BMW German Aviation Engine Calibration (Members Section)
08-18-2016 - ASIC No. 137: Destructive Whirling Test of Aero Marine Propeller (Members Section)
08-18-2016 - ASIC No. 135: Fifty-Hour Endurance Test of Packard Model 1A-744 8-Cylinder Aviation Engine (Members Section)
08-18-2016 - ASIC No. 134: Flight Test of Packard Fuelizer on Liberty 12 (Members Section)
08-18-2016 - ASIC No. 131: 300 HP Hispano-Suiza Compression Relief Device Torque Stand and Flight Test (Members Section)
08-17-2016 - ASIC No. 130: Standard 50-Hour Endurance Test of Packard Aviation Engine Model 1A-1116 (Members Section)
08-17-2016 - ASIC No. 126: Starting Torque on Liberty, Hispano-Suiza, and other Aviation Engines (Members Section)
08-17-2016 - ASIC No. 41: Report on the Six-Cylinder Benz Aeronautic Engine Rated at 200 HP (Members Section)
08-16-2016 - ASIC No. 17: Whirling Test of Micarta and Rubber-Covered Propellers (Members Section)
08-16-2016 - ASIC No. 12: Micarta Liberty Propeller (Members Section)
08-16-2016 - ASIC No. 8: Whirling Test of Micarta and Rubber-Covered Propellers (Members Section)
08-08-2016 - Pratt & Whitney Multi Row Engine Installation Drawings (Members Section)
08-07-2016 - Pratt & Whitney Single Row Engine Installation Drawings (Members Section)
08-01-2016 - Airventure 2016 Engines, by Tim Wheat
07-31-2016 - AEHS August 2016 Calendar
07-21-2016 - Turbomeca Artouste Airborne Auxiliary Power Plant Control and Electrical Systems
07-20-2016 - Turbomeca Artouste Airborne Auxiliary Power Plant Oil and Air Systems
07-19-2016 - Turbomeca Artouste Airborne Auxiliary Power Plant Fuel System
07-15-2016 - Turbomeca Artouste Airborne Auxiliary Power Plant Overview
07-10-2016 - AEHS Member Kenneth Zetterlund’s Restored R-3350 First Start
07-06-2016 - Book Review: The Focke-Wulf Ta 152, reviewed by Tom Fey
07-04-2016 - Images from RAF Cosford, by Al Charlevois
06-28-2016 - AEHS July 2016 Calendar
06-21-2016 - Allison V-1710 and Rolls-Royce Merlin Torsional Vibration Characteristics (1.3M PDF) --- by Robert J. Raymond and Daniel D. Whitney
06-21-2016 - Pratt & Whitney R-4360, JT3 and JT4 Turbojet Specifications, 1954 (Members Section)
06-20-2016 - Pratt & Whitney R-2800 Specifications, 1939 and 1954 (Members Section)
06-19-2016 - Rolls-Royce Conway Boeing 707 Installation (Members Section)
06-19-2016 - Pratt & Whitney R-2000 and R-2180 Specifications, 1954 and 1949 (Members Section)
06-18-2016 - Pratt & Whitney R-1830 Specifications, 1939 (Members Section)
06-17-2016 - Book Review: Arsenal of Democracy — The American Automobile Industry in World War II, revewed by Carl Kuhns
06-17-2016 - Canadian Pratt & Whitney R-1340 Specifications, 1954 (Members Section)
06-16-2016 - Pratt & Whitney R-1340 Specifications, 1939 (Members Section)
06-15-2016 - Pratt & Whitney R-985 Specifications, 1939 (Members Section)
06-14-2016 - Pratt & Whitney Gasoline Specifications, 1932 (Members Section)
06-04-2016 - Design and Development of Exhaust Valves From the Perspective of Modern Thinking
06-01-2016 - Rolls-Royce Conway Installation in the Handley Page Victor (Members Section)
05-30-2016 - AEHS June 2016 Calendar
05-25-2016 - U.S Aircraft Engine Acceptance Testing (Members Section)
05-24-2016 - Lockheed MQM-105 Drone Power Plant
05-16-2016 - Rolls-Royce Conway Operation (Members Section)
05-14-2016 - Rolls-Royce Conway Air and Drain Systems (Members Section)
05-14-2016 - U.S. Army Air Service Information Circulars 205, 216, 227, 291 and 293 Added
05-13-2016 - U.S. Army Air Service Information Circulars 48, 60, 66, 118, 118 and 127 Added
05-12-2016 - U.S. Army Air Service Information Circulars 28, 35, 42, 46 and 47 Added
05-12-2016 - Japanese Aircraft Engine Acceptance Testing
05-11-2016 - U.S. Army Air Service Information Circulars 5, 9, 11, 20, 22, 252 and 447 Added
05-09-2016 - Rolls-Royce Conway Starting System (Members Section)
05-05-2016 - Rolls-Royce Conway Oil System (Members Section)
05-04-2016 - Numerous pages updated to work correctly with modern browsers.
05-01-2016 - AEHS 2016 Convention Announcements
04-30-2016 - AEHS May 2016 Calendar
04-27-2016 - Daimler-Benz DB606 Animation by Sergio Pasquali
04-26-2016 - Rolls-Royce Conway Fuel System (Members Section)
04-24-2016 - Rolls-Royce Conway Accessories (Members Section)
04-22-2016 - Rolls-Royce Conway Hot Section (Members Section)
04-20-2016 - Rolls-Royce Conway Compressor (Members Section)
04-18-2016 - The Rolls-Royce Conway, World's First Turbofan
04-10-2016 - Torque Meter Volume 7 Now Available in Digital Form
04-09-2016 - Torque Meter Volume 6 Now Available in Digital Form
04-08-2016 - Torque Meter Volume 5 Now Available in Digital Form
03-31-2016 - AEHS April 2016 Calendar
03-30-2016 - Rare Engine Photos: The Wittber Radial — Australias' Oldest Aero-Engine
03-30-2016 - Rare Engine Photos: The Kelly & Lewis V-8
03-27-2016 - General Motors Research Laboratories X-250: Survivors Section Added
03-23-2016 - Eleven Wings Club Lectures Added to the AEHS Document Collection (Search Source/Publisher field = 'Wings')
03-18-2016 - The Junkers Jumo 213 Engine, by Doug Culy (Updated and Expanded)
03-11-2016 - Daimler-Benz DB 601 Animation (Updated and Exapnded) by Sergio Pasquali
03-06-2016 - Aviodrome: The Netherlands National Aviation Museum
02-29-2016 - AEHS March 2016 Calendar
02-21-2016 - A Study of Engines Exhibited at the 1929 Olympia Aero Show. Members Section, Additional Engine Descriptions and Maintenance Procedures
02-20-2016 - Fiat A14. Members Section, Additional Engine Descriptions and Maintenance Procedures
02-17-2016 - New Viewo Feature: A Woodworker Explains Radial Engines
02-16-2016 - New Video Feature: Pratt & Whitney Wasp Named Historic Engineering Landmark
02-13-2016 - The Meredith Effect: An Efficient Way to Recover the Heat Wasted in Piston Engine Cooling
02-09-2016 - New England Air Museum's Lawrance J-1 Restoration
01-30-2016 - AEHS February 2016 Calendar
01-27-2016 - Aircraft Engines and Strategic Bombing in the First World War, by Todd Martin
01-20-2016 - Book Review: Rotol – The History of an Airscrew Company, 1937 - 1960
01-19-2016 - Reno 2015 (High-Resolution Images in the Members Section)
01-11-2016 - Outstanding Compilation of Horizontally Opposed Aero Engine Information - by Jack Erickson
01-11-2016 - Eagles Mere Air Museum Engines
01-11-2016 - Curtiss 1950 Turbopropeller Brochure, courtesy of Tom Fey
01-04-2016 - Commercial Aircraft and Engine Specifications, 1921 ~ 1931
12-31-2015 - AEHS January 2016 Calendar
12-30-2015 - Added University of Palermo Museum of Engines to the Engine Locator
12-28-2015 - Daimler-Benz DB 601 Animation by Sergio Pasquali
12-22-2015 - The Curtiss-Wright SGV-1800, with new material.
12-21-2015 - Engine Approved Type Certificate List, Nos. 1 ~ 218, 1928 through 1939 (4.5M PDF)
12-21-2015 - Hall-Scott Liberty-Based Engine Descriptions and Specifications added to AEHS Document Collection
12-20-2015 - ASIC No. 149: Fifty-Hour Endurance Run of Hall-Scot Model L-6 Aviation Engine (Members Section)
12-19-2015 - Liberty Engine Research Material and Photographs Added to the AEHS Document Collection (Series 5 and 11)
12-18-2015 - AEHS/SARH 2015 Convention: New England Air Museum Aircraft (Members Section)
12-16-2015 - ASIC No. 064: Standard Report on the 300 HP Hispano-Suiza Aviation Engine with Steel Cylinders (Members Section)
12-13-2015 - AEHS/SARH 2015 Convention: New England Air Museum Racing Aircraft (Members Section)
12-12-2015 - U.S. Navy Aeronautical Engine Laboratory Report Index, by Paul Christiansen
12-12-2015 - Curtiss-Wright Cyclone 22 (Military XR-4090)
12-11-2015 - National Museum of the United States Air Force Engine Inventories
12-01-2015 - The Curtiss-Wright SGV-1800
11-30-2015 - AEHS December 2015 Calendar
11-29-2015 - Video: de Havilland Hydromatic Airscrew Manufacture
11-29-2015 - Video: de Havilland Hydromatic Airscrew Installation
11-28-2015 - The J58 Start Cart, by Tom Fey (Revised with New Material)
11-19-2015 - AEHS/SARH 2015 Convention: Anson Johnson's N13Y (Members Section)
11-18-2015 - AEHS/SARH 2015 Convention: Righter Engine Run — Added Video (Members Section)
11-18-2015 - AEHS/SARH 2015 Convention: New England Air Museum Engines (Members Section)
11-16-2015 - AEHS/SARH 2015 Convention: Righter Engine Run (Members Section)
11-14-2015 - AEHS/SARH 2015 Convention: Pratt & Whitney Museum (Members Section)
11-11-2015 - Added Cimarron Field and Mustang Field Museum to AEHS List of Engines in Museums
11-08-2015 - Wright Aero Helicopter Engines, by Carl Kuhns
11-06-2015 - The J58 Start Cart, by Tom Fey
11-03-2015 - 2015 AEHS/SARH Convention Presentations (more in the Members Section)
11-01-2015 - 2015 AEHS/SARH Convention Coverage
10-31-2015 - AEHS November 2015 Calendar
10-30-2015 - 1/8 Scale Model of the Whittle WU by John May
10-29-2015 - ASIC No. 124: Test of Revisions in Cooling Systems for Air-Cooled Cylinders (Members Section)
10-01-2015 - AEHS October 2015 Calendar
09-15-2015 - Video of David Irwin's Merlin 24 Running at the RAF Museum London's 2015 Battle of Britain Celebration
09-09-2015 - Tom Fey's Kiekhaefer 0-45-1 Runs! (Members Section)
09-04-2015 - Tom Fey's Kiekhaefer 0-45-1 Restoration Update (Members Section)
09-02-2015 - General Motors Research Laboratories X-250: with Additional Drawings and Images
09-01-2015 - AEHS September 2015 Calendar
08-24-2015 - General Motors Research Laboratories X-250
08-13-2015 - Bristol Engine Tests at the Royal Aircraft Establishment (web version) --- by Robert J. Raymond
08-12-2015 - Bristol Engine Tests at the Royal Aircraft Establishment (1.5M PDF) --- by Robert J. Raymond
08-10-2015 - Engines Displayed at EAA AirVenture 2015: Superior Gemini 100
08-09-2015 - Engines Displayed at EAA AirVenture 2015: Rotax 915iS
08-08-2015 - Engines Displayed at EAA AirVenture 2015: Rotax 912iS
08-07-2015 - Engines Displayed at EAA AirVenture 2015: D-Motor LF39
08-06-2015 - Engines Displayed at EAA AirVenture 2015: Continental CD-200 Series Diesel
08-05-2015 - Engines Displayed at EAA AirVenture 2015: Continental CD-100 Series Diesel
07-31-2015 - AEHS Document Collection Additions: Donor = Beland, Richard R.; Facility = Not Specified
07-30-2015 - AEHS August 2015 Calendar
07-27-2015 - AEHS Document Collection Additions: Donor = Neal, Robert J; Series = 06 and 08
07-17-2015 - Tom Fey Explores the Boulin Strobomeca Instrument
07-03-2015 - Pratt & Whitney Single Row Radials (Wasp and Hornet)
07-02-2015 - Junkers Jumo 205 Animations
06-29-2015 - AEHS July 2015 Calendar
06-21-2015 - Allison, Rolls-Royce and Junkers Valve Gear Animations
06-20-2015 - Lamborghini Aventador Firing Order
06-10-2015 - Wright R-2160 Tornado Restoration Photographs, Courtesy of Ray Zanella
06-08-2015 - Tom Fey's Kiekhaefer 0-45-1 Restoration Update (Members Section)
05-29-2015 - AEHS June 2015 Calendar
05-25-2015 - Engine Maintenance Costs by Charlie Cravens (Members Section)
05-15-2015 - Continental A-Series Engines: The A-100 (Members Section)
05-10-2015 - Daimler Benz DB601, DB603, DB605, DB610 Images, Drawings and Specifications (Members Section)
05-03-2015 - de Havilland Contra-Rotating Propeller Pitch Change Animations by Sergio Pasquali
04-30-2015 - AEHS May 2015 Calendar
04-22-2015 - Book Review: Westinghouse J40 Axial Turbojet Family - Development History and Technical Profiles
04-16-2015 - Continental A-Series Engines: The A-80 (Members Section)
04-13-2015 - Continental A-Series Engines: The A-75 (Members Section)
04-10-2015 - Tom Fey's Kiekhaefer 0-45-1 Restoration Update (Members Section)
04-05-2015 - Crankpin Bearings in High Output Aircraft Piston Engine, Updated (2.5M PDF) --- by Robert Raymond
04-02-2015 - Continental A-Series Engines: The A-65 (Members Section)
03-30-2015 - AEHS April 2015 Calendar
03-27-2015 - Lawrance J-1 CAD Model
03-23-2015 - David Irwin's Merlin Mk500-29 Runs
03-23-2015 - Continental A-Series Engines: The A-50 (Members Section)
03-22-2015 - Lawrance R-1 CAD Model
03-21-2015 - "Hex" Engine Firing Orders
03-09-2015 - More BMW 803A CAD Models
03-06-2015 - Pratt & Whitney R-4360 Animation
03-05-2015 - Book Review: The Race for Hitler’s X-Planes
03-05-2015 - Book Review: Piston Aero Engines - 3D CAD Images & Animations
03-01-2015 - New V-12 Firing Order Display (RIP Java!)
02-28-2015 - AEHS March 2015 Calendar
02-19-2015 - Rolls-Royce Tay Cutaway (Members Section)
02-18-2015 - Rolls-Royce Pegasus Cutaway (Members Section)
02-16-2015 - Rolls-Royce Spey Cutaway (Members Section)
02-15-2015 - Luca Mariotti’s Drone Restorations (Members Section)
02-13-2015 - Rolls-Royce Dart Cutaway (Members Section)
02-12-2015 - Rolls-Royce Gnome Cutaway (Members Section)
02-11-2015 - Rolls-Royce RB211 Cutaway (Members Section)
02-10-2015 - Jerry Wilcox's Gipsy Major Restoration
01-30-2015 - AEHS February 2015 Calendar
01-25-2015 - Wright Cyclone 9 Dataplates, by Carl Kuhns
01-17-2015 - Aircraft Magnetos
01-16-2015 - Book Review: The History of the Rolls-Royce RB211 Turbofan Engine
01-15-2015 - Tom Fey's Kiekhaefer 0-45-1 Restoration Update (Members Section)
01-07-2015 - Reno 2014
01-04-2015 - Napier Sabre Animations
12-31-2014 - ASIC No. 465: Analysis of Some United States Gasolines (Members Section)
12-26-2014 - Curtiss, Lawrance and Wright Engine Specifications and Images
12-23-2014 - New Curtiss, Wright and Curtiss-Wright Engine Specifications and Production Data
12-22-2014 - McCulloch Aircraft Engines (Members Section)
11-25-2014 - Crankpin Bearings in High Output Aircraft Piston Engine (2.5M PDF) --- by Robert Raymond
11-16-2014 - The Siemens-Halske Sh3 Differential Rotary
11-10-2014 - Wright R-1820 Development
11-10-2014 - Wright R-3350 Development
10-22-2014 - Hundreds of Air Service Information Circulars added to the AEHS Document Collection (Donor = Neal, Robert J) Many are online.
10-19-2014 - The Story of Jerry Wilcox's R-2600 Restoration Continues
10-14-2014 - Stepping Stones to Jet Propulsion; Sir Frank Whittle’s 1928 Cranwell Thesis and the Unbuilt Jet Engine Demonstrator, by Dr. Fred Starr (Members Section)
10-13-2014 - The 1929 Whittle Turbojet Demonstrator: Britain’s Greatest Lost Opportunity? By Dr. Fred Starr (Members Section)
08-27-2014 - Tom Fey's Kiekhaefer 0-45-1 Restoration Update (Members Section)
07-12-2014 - The BMW 803 Aircraft Engine (Members Section)
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
05-09-2014 - AEHS 2014 Convention Presentation: Paul Christiansen - The Westinghouse J40 (Members Section)
04-04-2014 - Rolls-Royce Merlin XX Installation, Mechanism, Carburetion and Lubrication Diagrams - AP 1590G
03-30-2014 - Propeller-Related Records at the UK National Archives at Kew --- Compiled by David Birch
03-23-2014 - Tom Fey's Mystery Contra-Prop Restoration (Members Section)
03-20-2014 - New Links
03-19-2014 - Ford's Aircraft Engine (Members Section)
12-16-2013 - The Rolls-Royce Merlin Aero-Engine: Early Development 1933 - 1937
11-26-2013 - An Aeroproducts Installation Engineer Remembers: Interviews with Robert Aukerman
11-11-2013 - How Supersonic Inlets Work, by J. Thomas Anderson
11-01-2013 - Tom Fey's Kiekhaefer 0-45-1 Restoration (Members Section)
09-26-2013 - Aircraft Carburetors and Fuel Systems Conclusion: Priming and ADI Systems, Summary
09-22-2013 - Aircraft Carburetors and Fuel Systems: Fuel Injection
09-21-2013 - Aircraft Carburetors and Fuel Systems: Speed-Density Systems
09-15-2013 - Aircraft Carburetors and Fuel Systems: Floatless Carburetors — Bendix-Stromberg Pressure Carburetors
09-04-2013 - Aircraft Carburetors and Fuel Systems: Floatless Carburetors — Chandler Groves, Holley and Chandler Evans
08-25-2013 - Aircraft Carburetors and Fuel Systems: Ideas, People and Companies
08-24-2013 - Aircraft Carburetors and Fuel Systems: Modern Float-Type Carbutetors
08-23-2013 - Aircraft Carburetors and Fuel Systems: Float-Type Carburetors
08-18-2013 - Aircraft Carburetors and Fuel Systems: Aviation Fuels
08-17-2013 - Aircraft Carburetors and Fuel Systems: Introduction to Carburetion
08-11-2013 - Tom Fey’s Righter 2-GS-17 Runs at Oshkosh (Members Section)
08-10-2013 - Aircraft Carburetors and Fuel Systems: A Brief History
07-28-2013 - Pratt & Whitney JT-3 Disassembly (Members Section)
07-27-2013 - Bristol Hercules, Centaurus, and Proteus Performance Curves (Members Section)
07-26-2013 - Bristol Sleeve Valve and Turbine Engines (Members Section)
07-15-2013 - Frank Whittle's W2B Turbojet: United Kingdom versus United States Development
06-26-2013 - Rotol Propeller, Governor, Fan and Spinner Specifications (Members Section)
06-22-2013 - Rotol Propeller Control Units, Spinners, Fans and Feathering Pumps (Members Section)
06-17-2013 - Werner J. Blanchard, the Man Behind Aeroproducts Propellers
06-09-2013 - McCook Field's 1918 Propeller Testing Laboratory (Members Section)
05-26-2012 - The Curtiss-Wright Cyclone 7
04-13-2013 - Fairchild (Ranger) Engines
04-11-2013 - German WWII Aircraft Engine Production
04-06-2013 - Jacobs Engines
03-25-2013 - Pratt & Whitney R-1830-43 Disassembly, Inspection and Reassembly (Members Section)
03-14-2013 - Turbocharger Development and Production, 1924 - 1945 (Members Section)
02-25-2013 - Inside the de Havilland Gyron Junior, Courtesy of Bruce Vander Mark (Members Section)
02-18-2013 - The Packard Variable Speed Drive, by Jerry Wells
02-14-2013 - Update to Brian Mills’ Rolls-Royce Griffon Restoration (Members Section)
01-30-2013 - The Engineering Division Side Type Turbocharger, 1922 - 1924 (Members Section)
01-06-2013 - US Army Air Corps Turbocharger Development, 1919 - 1922 (Members Section)
01-01-2013 - Curtiss-Wright XR-4090
12-21-2012 - The First Turbosupercharged Aircraft Engine
11-20-2012 - Bill Pearce's Old Machine Blog (Aircraft, Automobiles and Engines)
11-11-2012 - Evzen Vsetecka's Aircraft Engine Photographs: Hundreds of Rare Engines from All Over Europe
10-02-2012 - Japanese Ha51-01 (22-cylinder radial) Images and Ha54-01 (36-cylinder radial) specs
09-10-2012 - AEHS Document Collection Catalog (Members Version with Access to Over 40 Engine Accessory Manuals)
09-05-2012 - Triptane --- the Super Fuel (Members Section)
04-19-2012 - Catalog of Over 3,000 Reports from the USAF Flight Test Division. This is wonderful stuff!
04-04-2012 - The Junkers Jumo 213 Engine, by Doug Culy (Members Section)
03-29-2012 - Wright R-2600 Case History, by Jay Smith
03-21-2012 - Halford's H.1 in America by Dave Birch (Members Section)
03-09-2012 - Duesenberg Aircraft Engines by William Pearce (Members Section)
01-26-2012 - Engine-Airplane-Carburetor Cross Reference (Members Section)
01-25-2012 - Airplane-Engine-Accessory Cross Reference (December 1943) (Members Section)
01-04-2012 - Napier Dagger VIII Construction Details (Members Section)
12-31-2011 - Armstrong-Siddeley Tiger VIII Overhaul (Members Section)
11-17-2011 - El motor de la aviación: Completely Revised, Fall 2011 (Members Section)
11-13-2011 - Napier Sabre Overhaul (Members Section) Public Preview of Napier Sabre Service and Overhaul Tools
10-28-2011 - Pratt & Whitney Piston Engine Production
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)
09-30-2011 - Superchargers
09-09-2011 - Installation Drawings for 25 Aircraft Engines from 1924
08-31-2011 - Bristol Hercules 730 Construction Details (Members Section)
07-23-2011 - Characteristics of Fuels
07-21-2011 - The 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)
06-11-2011 - Manufacturing the de Havilland Gipsyqueen II - Part 1: Development, Features, Crankcase, Cylinder Barrel and Head (Members Section)
05-28-2011 - Merlin vs Allison: Aircraft Engine Performance Analysis at Rolls-Royce, ca 1940 --- by Robert J. Raymond
05-27-2011 - Comparison of Sleeve and Poppet-Valve Aircraft Piston Engines --- by Robert J. Raymond
05-15-2011 - Daimler-Benz 600-Series Aircraft Engine Specifications
04-19-2011 - Junkers Jumo 222 Intellegence Reports
04-18-2011 - Daimler-Benz 600-Series Aircraft Engine Images
03-19-2011 - All About Allison Serial Numbers
03-06-2011 - Supercharger Development in the U.S. During the Inter-War Period
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)
03-28-2010 - Improving the Mercedes
03-04-2010 - Szydlowski-Planiol Supercharger Test Report, with Critique by Jerry Wells
02-21-2010 - Manufacturing the Rolls-Royce Merlin (Members Section)
11-21-2009 - Table of US Engine Details, provided by Larry McClellan (PDF, XLS)
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)
05-26-2009 - The Engineering Division W-1: A Tale of Great Expectations, by Robert J. Neal (Members' Section)
02-23-2009 - R-4360 Service History for C-97 and KC-97 Aircraft in Air National Guard Units
12-31-2008 - The Liberty Engine and Torsional Vibration by Robert J. Raymond
05-21-2008 - Indexes for over 550,000 Air Force Documents
03-24-2008 - V-12 Firing Orders
10-03-2006 - The 120 HP Argyll -- Pioneer Sleeve Valve Aero-Engine
06-22-2006 - P&W Paint Specs
02-06-2006 - Index to Navy ADI(k) Microfilms of German Documents
10-28-2004 - USAF Case History Files Index
08-13-2003 - Packard Aero Engine Statistics
01-24-2003 - Air-Cooled Aircraft Engine Cylinders
01-16-2003 - Japanese Engine Designations, SSME Conclusion

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