"And then we slowly brought it back up, it gets into the same
downwash from the aircraft and it started to spin again."
For example, MSC Software's Adams multibody dynamics simulation solution was recently used by Saab to accurately capture interactions between the lifting forces on the rotor blades and
downwash on one of its prototype UAVs.
J., and Coauthors, 2014: Upwash exploitation and
downwash avoidance by flap phasing in ibis formation flight.
The finite volume discretization approach is used to discretize the whole domain so that separation of wind flow, upwash, and
downwash mechanisms can happen similar to the experimental study.
Also, the tail zero-lift-pitching moment coefficient ([C.sub.Mo_HT] is then estimated using (13) [21], where [C.sub.L[alpha]_HT] is the lift curve slope of the tail, [[epsilon].sub.o] is the
downwash angle at zero lift, [i.sub.W] is the wing incidence angle, and [i.sub.HT] is the tail incidence angle.
On the ground that morning, amid the brush rippling under the powerful
downwash, was a helicopter support team of Marines from Combat Logistics Battalion (CLB) 25.
These propellers are attached to a V-shaped box-wing structure designed to minimise the blocking of the main rotor's
downwash, while still delivering lift performance of their own.
It's probably because of the curvature, you get quite a bit of distortion, plus you get quite a bit of
downwash down the straights pushing the helmet forwards.
It changes the airflow aft of the wings, deflecting it downward, which causes increased
downwash over the tail, increasing its angle of attack, whether it is a high- or low-wing airplane.
Reading all those war books taught me some helicopter terminology, like "translational lift." Simply put, when a helo is moving slowly, the main rotor's
downwash creates vortexes and general turbulence immediately around it.