The landing site may have had some slope hence the sudden departure . I know little about helicopters so asked Gemini.
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Can a helicopter land on a slope?
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Yes, helicopters can land on slopes, but it's a more complex maneuver than landing on flat ground and requires a skilled pilot. There are several factors to consider:
Slope angle: Different helicopters have different maximum slope ratings. Landing on a slope that is too steep is dangerous.
Landing direction: Ideally, the pilot will try to land across the slope, not up or down it. This reduces the risk of tail rotor strike and other issues.
Control techniques: The pilot uses a combination of cyclic and collective controls to carefully touch down and maintain balance on the slope.
Because of the added difficulty, slope landings are usually only done when necessary, like during search and rescue missions in mountainous areas. Here are some resources that go into more detail about slope landings:
AOPA article on slope landings: [slope landings ON Aircraft Owners and Pilots Association aopa.org]
Video on How To Land a Helicopter on a Slope: How To Land a Helicopter on a Slope. Helicopter Slope Operations.: YouTube