A free fall simulator comprising: a flight chamber provided with an air supply from fans, and a wind tunnel system extending from the upper part of the flight chamber and having two separate branches for guiding an airflow, each of said branches of the wind tunnel system being divided into separate ducts; the wind tunnel system further comprising: a distributor positioned above the flight chamber, bending vanes connecting the two separate branches of the wind tunnel system below the flight chamber, and a nozzle positioned below the flight chamber between the bending vanes and the flight chamber; wherein the fans are installed in a vertical position in separate ducts of the wind tunnel system, located in parallel with the flight chamber, wherein the static pressure in the flight chamber is near to the atmospheric pressure, wherein the separate ducts with fans are split in the wind tunnel system in its upper horizontal section after the flight chamber, wherein the airflow is divided into the separate branches of the wind tunnel system by the distributor, such that said airflow is again joined in the bending vanes, so as to rectify the airflow to the nozzle, and the airflow entering the nozzle thereby travels back to the flight chamber, and wherein the wind tunnel system of the free fall simulator further includes a cooling system with a heat exchanger and auxiliary fans, wherein cooling system is installed at the outlet of each of the two separate branches of the wind tunnel system. a flight chamber provided with an air supply from fans, and a wind tunnel system extending from the upper part of the flight chamber and having two separate branches for guiding an airflow, each of said branches of the wind tunnel system being divided into separate ducts; the wind tunnel system further comprising: a distributor positioned above the flight chamber, bending vanes connecting the two separate branches of the wind tunnel system below the flight chamber, and a nozzle positioned below the flight chamber between the bending vanes and the flight chamber; a distributor positioned above the flight chamber, bending vanes connecting the two separate branches of the wind tunnel system below the flight chamber, and a nozzle positioned below the flight chamber between the bending vanes and the flight chamber; wherein the fans are installed in a vertical position in separate ducts of the wind tunnel system, located in parallel with the flight chamber, wherein the static pressure in the flight chamber is near to the atmospheric pressure, wherein the separate ducts with fans are split in the wind tunnel system in its upper horizontal section after the flight chamber, wherein the airflow is divided into the separate branches of the wind tunnel system by the distributor, such that said airflow is again joined in the bending vanes, so as to rectify the airflow to the nozzle, and the airflow entering the nozzle thereby travels back to the flight chamber, and wherein the wind tunnel system of the free fall simulator further includes a cooling system with a heat exchanger and auxiliary fans, wherein cooling system is installed at the outlet of each of the two separate branches of the wind tunnel system.