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I practiced some run on landings the other day and got a little sideways, and my instructor said this is very dangerous but he did not take over. Has anyone flipped a heli over by doing this?

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I don't know of any specific cases, but it is a very real possibility. During a running landing you are still fairly light on the skids, and if one of the skids got stuck while sliding sideways you could roll the helicopter over. I had a close call on a concrete runway, while doing full-down autos. The skid shoe caught in one of the expansion joints, and the helicopter came close to rolling over.

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Sideways? Dang, I kept skidding to the right of the centerline. How might one correct that? Possibly moving the cyclic to the left?

 

Later

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Yes, but why!

 

Joker

Because the left side of the runway doesn't have any skidmarks. I need to even it out.

 

Later

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Sideways? Dang, I kept skidding to the right of the centerline. How might one correct that? Possibly moving the cyclic to the left?

 

Later

 

in a running landing, heading is controlled my the T/R, why would you mess with the cyclic if you are sliding sideways? You want the skids moving in a forward direction, not the forward and left action that adding left cyclic would produce.

 

 

In terms of skidding sideways, I would say just put down the collective and let the weight of the helicopter stop the motion all together. You run the risk of over correcting with the cyclic and rolling over the other way.

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in a running landing, heading is controlled my the T/R, why would you mess with the cyclic if you are sliding sideways? You want the skids moving in a forward direction, not the forward and left action that adding left cyclic would produce.

 

AndrewT,

 

I think you slightly misunderstand the scenario.

 

I think Witch is talking about a drift right even though his skids are facing fowards. This is a common error and can be corrected with left cyclic. In other words, his ground trick has a right drift, while he maintains his heading.

 

My question back was...why? e.g. what is causing this drift?

 

Joker

 

If that was not what he was talking about, then his problem is deeper than I thought!

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We get to do our down a patched runway in the summer when the OAT is in the high 40's ©. You better be sure you stay on target and don't spin sideways lest you get stuck in the tar. Even on normal touch downs I'd had to to wiggle the thing out. Nothing severe mind you, but as a 30 hour wonder, it really makes you think about what you learned with dynamic rollover. ;)

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Sideways? Dang, I kept skidding to the right of the centerline. How might one correct that? Possibly moving the cyclic to the left?

 

Later

 

 

The right drift on a running landing is caused by the thrust from the tail rotor, translating tendancy. You will have to apply left cyclic to keep your ground track straight.

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Because the left side of the runway doesn't have any skidmarks. I need to even it out.

 

Later

 

 

LOL, I like that...

 

A cross wind might give you some drift as well.

 

You can add left cyclic or just land on the left side of the runway/taxiway and drift to a stop on the centerline (I meant to do that, yeah, thats the ticket)...

 

Oh and just a note--the right drift due to tail rotor thrust will be a left drift in one of those helos with the blades swinging opposite the way you are used to (e.g. Eurocopter).

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Hate run on landings especialy on grass all ways waiting for the rabbit hole or

some unsean soft ground to screw it all up at the last moment.

 

 

I suggest all of you read Vertical Magazines article this month " Pass on the Grass". Great article about doing auto's and run on's unnecessarily to grass fields and the inherent dangers.

 

Yes, to the earlier question, you can roll a bird over if one skid gets caught...you can also create an uneven slide if one skid hits a painted surface ( ie, numbers) when on a runway...let alone those damn cracks.

 

To the other question...you can't just "dump" the collective on a run on landing...the goal is to burn off forward momentum left over from either an auto...or T/R problem...you have to continue a lil forward cyclic and keep the skids light and slow the bird down gradually...dumping the collective once the skids touch is like running into a brick wall...I know...I did it on my first full unassisted run-on and I stopped in about 4 feet of runway...it was not too impressive..

 

Again, check out the article....Goldy

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