However, some aircraft, such as the Lockheed P-38 Lightning had propeller rotation purposely reversed to reduce downwash on the central horizontal stabilizer, to make for better gunnery.
32.
Control was to be provided by cables that could alter the pitch of the rotor blades, and by steerable vanes at either end of the machine intended to direct the downwash of the rotors.
33.
Trials done in Kosovo for the United Nations have demonstrated that the ability to fly low and slow without the downwash and vibrations of a helicopter make the airship suited for mine detection, Stroehle said.
34.
In mathematical terms, the local induced change of angle of attack \ alpha _ i on a given section can be quantified with the integral sum of the downwash induced by every other wing section.
35.
The wing has a built-in mid-span twist to offset the effects of the canard's downwash, with the inboard having 2 degrees less twist than the outboard portion of the wing.
36.
In late 1949 low-speed wind tunnel tests showed that a vortex was generated by the wing which caused a large downwash on the tailplane; this issue was solved by lowering its height below the wing.
37.
This fan forces low pressure air through two slots on the right side of the tailboom, causing the downwash from the main rotor to hug the tailboom, producing lift, and thus a measure of directional control.
38.
The Phillips 66 Company requested, and the FAA approved and implemented, a 1-mile no-fly zone around the plant to prevent engine vibration and / or helicopter rotor downwash from dislodging any of the wreckage.
39.
Also, the energy of the downwash is still dissipated, thus when it has no more energy, it no longer transfers momentum to the atmosphere .-talk ) 16 : 20, 19 August 2012 ( UTC)
40.
In aeronautics "'downwash "'is the change in direction of air deflected by the aerodynamic action of an airfoil, wing or helicopter rotor blade in motion, as part of the process of producing lift.
