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Main rotor disk vortex interference Weathercock stability Tail rotor vortex ring state. Loss of tail-rotor effectiveness (LTE) [1] occurs when the tail rotor of a helicopter is exposed to wind forces that prevent it from carrying out its function—that of cancelling the torque of the engine and transmission.
More than 50% of patients who suffer from a traumatic brain injury will develop psychiatric disturbances. [6] Although precise rates of anxiety after brain injury are unknown, a 30-year follow-up study of 60 patients found 8.3% of patients developed a panic disorder, 1.7% developed an anxiety disorder, and 8.3% developed a specific phobia. [7]
Torque effect is an effect experienced in helicopters and single propeller-powered aircraft is an example of Isaac Newton's third law of motion, that "for every action, there is an equal and opposite reaction." In helicopters, the torque effect causes the main rotor to turn the
Another way to eliminate the effect of torque created by the rotorwing is by mounting the engine on the tips of the rotorwing rather than inside the helicopter itself; this is called a tip jet. One example of a helicopter using such a system is the NHI H-3 Kolibrie , which had a ramjet on each of the two wingtips, and an auxiliary power unit to ...
A childhood acquired brain injury can have a huge variety of effects on the child, at different times during the development of their brain function. Depending on how well informed another person is about the injury and about the nature of brain development , it can often be easy to ascribe aspects of a child's behaviour (or 'presentation') to ...
WASHINGTON (Reuters) -Officials have positively identified 55 of the 67 people killed in Wednesday's midair collision between an American Airlines passenger jet and a military helicopter over the ...
High-altitude cerebral edema (HACE) is a medical condition in which the brain swells with fluid because of the physiological effects of traveling to a high altitude. It generally appears in patients who have acute mountain sickness and involves disorientation, lethargy, and nausea among other symptoms.
Prognosis depends on severity and can range from total recovery to severe disability to death when the injury is severe. [54] One third of patients diagnosed with SBS die, one third survives with a major neurological condition, and only one third survives in good condition; therefore shaken baby syndrome puts children at risk of long-term ...