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Vertical take offs

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I've been flying helicopters for the past 10 years for the Marine Corps, and look forward to transitioning to HEMS after retirement. One curiosity I have though, every EMS helicopter take off I've seen in person or on video shows them climbing vertically to about 100'AGL before transitioning.

In the military, we teach to fly certain height/airspeed combinations to be right in the middle of the green portion of our Height/Velocity diagrams, should we lose an engine on transition. Obstacle take offs are obviously different because we want to get up and over them before transitioning, but EMS helos do these same vertical take offs regardless of what's in front of them or not.

Can anyone tell me why EMS pilots do vertical take offs from ~100'AGL before transitioning?

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