Here are some helpful links to sources of technical data.
(C.A.P. is not responsible for content.)
AIRPLANES
Hangar 9 Aeroworks - Aeronca
George York Technical Library
VintageBonanza.com
C.A.P. Staggerwing Model 17 Library
Southwest Aero Exchange (Model 18)
The Bucker Pages
CAP Service Bulletins
Cessna 305/L-19 Bird Dog - Parts
Cessna Pilot's Association
Commander 112/114/115
Culver Cadet
Curtiss /Curtiss-Wright (including Travel Air)
DeHavilland DHC-2 Beaver
California Golden State Coupers
Luscombe 1
Luscombe 2
Fairchild Club
NC28640
Fairchild 24 Restoration
International Fleet Club
Howard Club - Maintenance
Rogueair.com
The Monocoupe Club
Monocoupe Restoration Resources
Random Monocoupe Technical Data
Navion
NORTH AMERICAN AVIATION
Banaire Enterprizes (T6, T28, BT13, BT15)
Lance Aircraft Supply (T6)
Piper E-2, J-2, J-3, J-4, J-5, TG-8, L-4, Pa-11, Pa-12, Pa-14, and Pa-18/L-21
Piper PA15, PA17, PA20, PA22 (Short Wing Pipers)
PA-18 Drawings (Unofficial)
Rearwin / Commonwealth
SpartanExecutive.com
Spartan Aviation Co. History
Stearman Restorer's Assoc.
Stinson 108 Series
International Stinson Club
Hangar 9 Aeroworks - Stinson
Early Documents / Service Bulletins
C.A.P. STC Engine Upgrades
Travel Air Restorers Assoc.
See also - Curtiss / Curtiss-Wright
Waco Drawing Sources
Where to Find It
Waco Type Certificate Data Sheets
Waco Restorers & Technical Advisors
ENGINES
Continental (Small 4-cylinder)
Franklin (6-cylinder)
Franklin Aircraft Engnes, Inc.
Warner Engine Tips and Links
Radial Engines Limited
General Piston Engine Theory
and Design Information for
Gear-Heads
Articles by John Schwaner
Mechanic support
PARTS & ACCESSORIES
Eiesemann Magnetos
Eisemann Service Handbook
Eisemann Parts Catalog
WAR SURPLUS PARTS
Banaire Enterprizes
Scintilla Magneto Overhaul
Stromberg Carburetor Overhaul