Helo crashes on deck of a ship

[Super18Ordie]

http://www.big-boys.com/articles/helicrash3.html


Anywhere know where this was?

 

[BigIron]

Persian Gulf July of 02. They indeed lost tail rotor control. All survived, and so did the pax.

 

[MIDNJAC]

yep.....our unit CO showed us that video freshman year, and I believe he said the same thing

 

[Fly Navy]

Persian Gulf July of 02. They indeed lost tail rotor control. All survived, and so did the pax.

Lucky

 

[HH-60H]

I'd rather be lucky than good.

 

[ChuckMK23]

Looks like they ran out of left peddle..

 

[HH-60H]

Looks like they ran out of left peddle..

On second look at that video, I agree. You can see the slight right yaw all the way down. I am suprised though that coming into ground affect did not reduce the power reqs. Do you think they just weren't close enough to the deck?

 

[Fly Navy]

If you watch closely, when it's about 90 off from the camera, you can see the tail rotor is almost stopped.

Sure it's not camera shutter speed?

 

[T-man]

Sure it's not camera shutter speed?

I'm sure a lot of it is probably shutter speed, but the tailroter would definitely have to slow down in order for it to yaw the way it did.

 

[Fly Navy]

I'm sure a lot of it is probably shutter speed, but the tailroter would definitely have to slow down in order for it to yaw the way it did.

That wasn't the issue. I know this. The issue is whether it stopped or not. I'll look again.

Edited to say: Tail rotor hasn't stopped, it just slowed to sync with the shutter speed.

 

[skidkid]

I wasnt there but here are some thoughts. As he came in one of two things happened.
Number one he had a stuck pedals situation i.e he lost the ability to change the pitch of the tail rotor to compensate for his power corrections. This could be caused by a loss of a control linkage or some fod at the pedals. I saw it happen once from TOW missile wire wrap around the pitch change links.

The other possibility is a loss of tail rotor authority. As he made his approach below the ship superstructure he lost his relative wind casing his tail rotor to be unable to "bite" on the turbulent air that was no longer being pushed behind him. If I had to guess I would say he came in heavy in a hot humid environment and didnt get his power in early so as he did the "clean and jerk" at the bottom. That rush in power probably caused a rotor droop which affected the tail rotor at the same time he lost his relative wind.

I could be wrong Im only an amatuer aerodynamics guy and Im glad they all got out. Crashing sucks.

 

[mules83]

I couldn’t tell what type ship that was but I know on CG's, one of the GTE's exhaust is right before the helo pad. The helo could have gone through the ships exhaust and all that hot/low density air could have affected available power.

With what skidkid said about wind, the ship has very little wake and that sea is dead calm so wind probably wasn't an issue.

There is another interesting video of a -46 not making the deck at this website; 6th video down on the website. (cant post, wrong format). There is some good tapes on that site including a marine -53 chopping off its own refueling probe, pretty interesting.

http://www.rapp.org/archives/2004/09/aircraft_crash_videos/

 

[E5B]

I That rush in power probably caused a rotor droop which affected the tail rotor at the same time he lost his relative wind.

For those of you wondering, every turn the main rotor loses, the tail rotor loses 6-8 turns, hence losing effectiveness sooner. Again, a lot of other factors are more than likely involved.

Good post Skid

 

[Fly Navy]

For those of you wondering, every turn the main rotor loses, the tail rotor loses 6-8 turns, hence losing effectiveness sooner. Again, a lot of other factors are more than likely involved.

Good post Skid

This is the same for all helos?

 

[skidkid]

It varies with any number of other factors but it is easier to lose tail rotor authority due to the smaller size of the blades.