Helicopter take off

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upup

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I saw a Heli take off exactly like this one yesterday and ask someone why the slow take off. He mention something like the jett engine needs to get air in. Did I understand him correct?

[video=youtube;kbXIzgVxpkI]https://www.youtube.com/watch?v=kbXIzgVxpkI[/video]
 
What do you mean by slow takeoff? The long time on the ground with engine running?
 
Robertvv said:
No, lift from the ground, pause a moment then move slowly forward and then take off. On the video from 4 minutes onwards.
Click to expand...
That could be more like airfield rules - he's 'taxiing' (not that you can taxi (roll along the ground) in something with skids where wheels should be) from where he started to the runway proper. Odds are he had a final clearance with ATC and then properly 'took off' along the runway, much like the flight path a fixed wing would take ...it makes air field control simpler.
 
Robertvv said:
No, lift from the ground, pause a moment then move slowly forward and then take off. On the video from 4 minutes onwards.
Click to expand...

Where he transitioned from the pad to the runway?
 
Robertvv said:
Yes, why doesn't he just go up and away
Click to expand...

Only in rare circumstances do helicopters make a vertical or towering takeoff, mainly to avoid ground obstacles in confined areas.

There are significant safety benefits to a 'slow' takeoff, including ground-effect lift during the hover-taxi, controllability, and dealing with an engine failure. Forward speed provides lift (just like a fixed wing aircraft), and puts less stress on the engine.

Hollywood is responsible for many myths about flying!
 
Robertvv said:
I saw a Heli take off exactly like this one yesterday and ask someone why the slow take off. He mention something like the jett engine needs to get air in. Did I understand him correct?
Click to expand...
On the "jet" part:

https://en.wikipedia.org/wiki/Turboshaft


As for slow take-off:
  • That one looks abnormal - they're jumping it off batteries
  • Much like a diesel engine I'd imagine you'd want to give it a bit of time to warm up before stressing it
  • Being close to the ground makes things inherently more dangerous so I can see why a pilot would want a slow & steady approach
  • To add to the above point - close to ground means no auto-rotate
 
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