Information about this crash, please?

[Jay Honeck]

Can anyone tell me anything about this crash?:

http://www.alexisparkinn.com/photogallery/Videos/Puma_Crash.wmv

A contributor sent it in for inclusion on our aviation video page, but
he knew nothing about the location or circumstances of the accident.

If you're interested, the whole page may be viewed here:

www.AlexisParkInn.com/aviation_videos.htm

Thanks,
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

[George Patterson]

Jay Honeck wrote:
> Can anyone tell me anything about this crash?:

From what's visible in the video, the tail rotor is slowing down, getting very
slow by the time the chopper goes over. My bet is that the pilot hit the ground
with the tail rotor when he touched down. After that, it's equal & opposite
reaction time.

George Patterson
Coffee is only a way of stealing time that should by rights belong to
your slightly older self.

[[email protected]]

Yikes! I think G was right - he touched down kinda hard in a tail low
attitude and pranged the tail rotor. What I don't understand was why he
got airborne again when he shoulda dumped the collective and planted
it. The first guy that got thrown out was right in the path of the main
rotor when the helo rolled on its side it looked like..

[Dave]

Same, looks like he tagged the tail rotor and broke the shear
coupling, loosing TR authority.

Shoulda planted the collective right then, but I was not there, so I
am not to criticize.. :( ...

Dono if the 1st guy made it away or not, he was running when the
camera last saw him..

Dave



On 5 Dec 2005 17:06:32 -0800, "
> wrote:

>Yikes! I think G was right - he touched down kinda hard in a tail low
>attitude and pranged the tail rotor. What I don't understand was why he
>got airborne again when he shoulda dumped the collective and planted
>it. The first guy that got thrown out was right in the path of the main
>rotor when the helo rolled on its side it looked like..

[Flyingmonk]

Yeah, George was correct. Chopper lost tail rotor authority after
ground strike. More analysis by pro helo pilots and techies here
http://makeashorterlink.com/?H2C52254C .

The Monk

[Skywise]

Dave > wrote in
:

> On 5 Dec 2005 17:06:32 -0800, "
> > wrote:
>
>>Yikes! I think G was right - he touched down kinda hard in a tail low
>>attitude and pranged the tail rotor. What I don't understand was why he
>>got airborne again when he shoulda dumped the collective and planted
>>it. The first guy that got thrown out was right in the path of the main
>>rotor when the helo rolled on its side it looked like..
>
> Same, looks like he tagged the tail rotor and broke the shear
> coupling, loosing TR authority.
>
> Shoulda planted the collective right then, but I was not there, so I
> am not to criticize.. :( ...
>
> Dono if the 1st guy made it away or not, he was running when the
> camera last saw him..
>
> Dave

Here's my admitedly uneducated guess.

If the tail rotor hits the ground and breaks "stuff", then
the engine suddenly has an excess of power due to the lack
of drag because it's no longer driving the tail. That surge
of power then causes the main rotor to speed up causing
extra lift.

Brian
--
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[Flyingmonk]

Brian wrote:
>If the tail rotor hits the ground and breaks "stuff", then
>the engine suddenly has an excess of power due to the lack
>of drag because it's no longer driving the tail. That surge
>of power then causes the main rotor to speed up causing
>extra lift.

Excellent observation, I agree...

[Matt Whiting]

Flyingmonk wrote:

> Brian wrote:
>
>>If the tail rotor hits the ground and breaks "stuff", then
>>the engine suddenly has an excess of power due to the lack
>>of drag because it's no longer driving the tail. That surge
>>of power then causes the main rotor to speed up causing
>>extra lift.
>
>
> Excellent observation, I agree...
>

And extra torque that the damaged tail can no longer counter.

Matt

[Flyingmonk]

>And extra torque that the damaged tail can no longer counter.

That too!

Did you see the link I posted to PPrune about the same acident,
http://makeashorterlink.com/?H2C52254C it even shows 'snap shots' that
shows and explains critical moments?

[Matt Whiting]

Flyingmonk wrote:

>>And extra torque that the damaged tail can no longer counter.
>
>
> That too!
>
> Did you see the link I posted to PPrune about the same acident,
> http://makeashorterlink.com/?H2C52254C it even shows 'snap shots' that
> shows and explains critical moments?
>

No, I missed that link. I saw the still shots shown above, but without
seeing the video first it was hard to get the gist of it.


Matt

[Jay Honeck]

> No, I missed that link. I saw the still shots shown above, but without
> seeing the video first it was hard to get the gist of it.

A video really is worth a thousand words, or pictures. It's very hard
to grasp what's happening in a crash from just a few still photos.

FYI: A contributor has sent me a whole bunch of new videos that I've
just uploaded to the site. It's amazing how big this page is
getting...

See them at http://www.alexisparkinn.com/aviation_videos.htm
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

[Flyingmonk]

Thanks for having it Jay. I'm sure alot of us appreciate it.