Question Surname:  Name: you now insert an User-id and a password for the management of the question. User ID*:  For Your safety, uses a password not used in other internet services. Password*: Confirmation of the password*: The marked fields with * are obligatory.  Category of the question:*   Aircraft design Aerodynamics Aeronautical constructions Aeronautical technologies Aeronautical engines Aerospace electronics Experimental fluid-dynamics (wind tunnel) Flight instruments Aerial navigation Aerial circulation Aeronautical english Medicine, aeronautical psychology Meteorology Aeronautical law    Object of the question:* Contents of the question* The questions will be inserted in all the versions of our portal. The questions will be inserted with the language that you used . You can write the questions in more languages. The languages of our versions are: English, French; Spanish, Italian and Portuguese. . Nation: e-mail: The marked fields with * are obligatory.