Is there a comprehensive source for aircraft specification data for most of the aircraft in the world? I'm aware that I can look at the Wikipedia entry for an aircraft and discover specifications like the MTOW, length, cruise speed, etc. However, I was wondering whether there is a (preferably free) source of all this data combined for most aircraft. Does such a data source exist?
You can find a lot of information about aircraft in their Type Certificate Data Sheet that is available from the FAA or other certificating authorities. The FAA's is located here. It takes a bit of time to find certain things, and other things aren't included like range, or sometimes dimensions.