Abstract: The present invention provides an aircraft simulating apparatus having an optical projection apparatus with a light beam source (11) and a projection screen (13); and a cabin (20), which includes in its interior a seat (21) and a front window (22) located between the seat and a front part of the cabin. The projection screen is located inside the cabin to be visible from the seat through the front window. The aircraft simulating apparatus is characterized in that the cabin has an outer width (W) seen from the front side in the range from 800 mm to 4000 mm, preferably from 1500 mm to 2500 mm; and the front edge of the seat (21a) is spaced apart from the front centered portion (13a) of the projection screen being most remote of the seat by a distance (D) in the range from 1500 mm to 3000 mm, preferably 1700 mm to 2200 mm.