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Helicopter are very complex aircraft so that the achievement of high performances required a long design activity helped by experiments and simulations.
The wind tunnel tests of helicopter are usually split in tests of the fuselage (including rotor hub) and tests of the rotor.
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Fuselage models (the so called “drag models”) at GVPM can be tested in both closed and open-jet test chamber while the rotors are usually tested in the open jet.
Aerodynamic performance of rotor/propellers with diameter up to 2.5m and power up to 75 kW can be tested in GVPM open-jet test section by means of a test rig capable to reproduce the complete conversion phase typical of tiltrotors and eVTOLs.
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