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Old 10-29-2013, 00:06   #1
HollowHead
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Another stupid helicopter question...

How hard would it be to land on an elevated platform high enough and small enough to not offer ground effect? HH
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Old 10-29-2013, 00:55   #2
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Old 10-29-2013, 01:09   #3
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The helicopter will require more power to hover, that's about it. Assuming the pilot can hover, it shouldn't be hard (not accounting for wind effects).

I'm not a pilot or subject matter expert though.

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Old 10-29-2013, 01:12   #4
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Depends more upon the other circumstances than the size of the LZ


Total altitude, atmo conditions, acft weight and power available etc.

A "pinnacle" landing, is not terribly difficult in and of itself, it's generally the location and specifics that make it more or less challenging.

The Okie Corral

This was a rather challenging day, as even clear, the wind down the valley, and total altitude, plus configuration of my helo, was not a good mix. But it pretty much fits your ?, as my main landing gear and tail barely fit at the same time, and my pilot was sticking over the vert drop off.
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Old 10-29-2013, 01:25   #5
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Nothing to add. I just like these pictures.

The Okie Corral

The Okie Corral
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Old 10-29-2013, 02:26   #6
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Quote:
Originally Posted by HollowHead View Post
How hard would it be to land on an elevated platform high enough and small enough to not offer ground effect? HH
The act of landing on your platform wouldn't be very difficult as long as there was sufficient power to allow for an OGE hover. (depends on weight and density altitude) Sea level-easy, Mt Everest-not likely.

Ground effect improves hover performance up to about "one rotor diameter" so your platform would only need to be 30'-40' high for most light/medium helicopters to lose any benefit from ground effect.

In many helicopters, the pilot cannot actually see the landing gear so the most challenging aspect would be to precisely place the landing gear on a platform small enough to be "shielded" from downwash by the fuselage. Without falling off. Still, any competent helicopter pilot should be capable of that.
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Old 10-29-2013, 02:43   #7
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<pointless turntable comment HERE>
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Old 10-29-2013, 02:55   #8
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Old 10-29-2013, 13:06   #9
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Nothing to add. I just like these pictures.

The Okie Corral

The Okie Corral
Me, too.

I had drinks with some MH-47E pilots on Saturday night - very high speed, very competent guys.
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Old 10-29-2013, 14:50   #10
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Thanks, gents. Could you also recover from ground resonance without ground effect? IIRC, there was a scene in either the opening or closing of "MacGyver" where an Alouette goes into resonance on a rooftop but the pilot recovers. HH
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Old 10-29-2013, 18:03   #11
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Thanks, gents. Could you also recover from ground resonance without ground effect? IIRC, there was a scene in either the opening or closing of "MacGyver" where an Alouette goes into resonance on a rooftop but the pilot recovers. HH

Yes, ground resonance, is about vibration from being on the ground, with skids. It has nothing to do with ground effect.
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