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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Composite heli crash, walk away.
01-08-2015 05:38 AM  5 years ago
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Machinehead01

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Lower Michigan

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Composite heli crash, walk away.
http://vimeo.com/115532128

Lucky to have lived through this one!!!
"You judge according to the flesh; I am not judging anyone."
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01-08-2015 05:49 AM  5 years ago
ICUR1-2

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Ottawa, Ontario

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thanks for sharing

carbon blades are expensive. I wonder what a carbon fiber heli is worth
spending time, paying attention
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01-08-2015 10:02 AM  5 years ago
FastR1Red

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Melbourne Australia

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Great video, good find. Were they from New Zealand?
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01-08-2015 01:27 PM  5 years ago
dkshema

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Cedar Rapids, IA

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Looks as if someone needs to revisit the System Safety Analysis, as well as the Failure Modes Effects Analysis for the aircraft.

The pilots were quite lucky here.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

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01-08-2015 02:49 PM  5 years ago
Machinehead01

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Lower Michigan

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Pretty sure it was in...
New Zealand. +1 there dkshema!

Tom
"You judge according to the flesh; I am not judging anyone."
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01-08-2015 03:31 PM  5 years ago
rcflyerheli

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Granbury, TX USA

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I dunno, seems like they knew pretty well immediately what had happened and were able to make a successful ending out of it.

Apparently they indicated that the phasing rod end that failed had a high cycle count on it. Wonder how many?
Logo 700, Specter 700, Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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01-08-2015 03:52 PM  5 years ago
RM3

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Killeen, Texas - USA

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towards the end they indicated that the rod end was well under the load limit as well cycle count... the dang thing was probably defective OR... they used purple or blue instead of red...showing a preference will only get you into trouble, 90% of everything is crap...
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01-08-2015 03:56 PM  5 years ago
shawmcky

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Isle of Wight,United Kingdom

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Team- unbiased opinion.K.I.S.S principle upheld here
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01-08-2015 04:19 PM  5 years ago
cdrking

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Seattle

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I pooped my pants watching that.To hover is divine, the alternative is rather PLANE.
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01-08-2015 04:29 PM  5 years ago
SuperSixTwo

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Virginia City, NV ---USA

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Talk about an E ticket ride. Wow.
I wonder what a carbon fiber heli is worth
Two lives right now!
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01-09-2015 12:56 AM  5 years ago
EEngineer

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TX

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Is what they called a "scissor link" similar to the anti-rotation bracket on our helis?
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01-09-2015 01:29 AM  5 years ago
EEngineer

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TX

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Never mind....it's the equivalent of the follower arm/arms.

On some pics, looks like they have another "follower arm" on the bottom part of the swash that does what an anti-rotation bracket would do.
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01-09-2015 01:30 AM  5 years ago
ICUR1-2

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Ottawa, Ontario

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thought it was kind of convenient they had a camera on the tail.
A part fails that shouldn't have.
maybe staged to demonstrate the aircraft capability to withstand a common failure ?
spending time, paying attention
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01-09-2015 01:41 AM  5 years ago
EEngineer

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TX

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Looks as if someone needs to revisit the System Safety Analysis, as well as the Failure Modes Effects Analysis for the aircraft.
Perhaps a swash re-design....

Very lucky pilots.
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01-09-2015 01:43 AM  5 years ago
ICUR1-2

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Ottawa, Ontario

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agreed very lucky
spending time, paying attention
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01-09-2015 02:42 AM  5 years ago
Glenn Goodlett

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California

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I could not believe how they turned a poor design into a "pitch" for a great helicopter. The one dude has "totaled" two of the helicopters and still talking about how great it is. It's like he has nine lives and knows it.
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01-09-2015 03:15 AM  5 years ago
icanfly

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ontario

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carbon fiber heli is worth
a mil maybe 2 probably, with the cost of the initial molds, after that maybe half, depending on how costly testing is, those guys did a great job of bringing it down from so many wild pitches,

third party part? that could not have been the best choice on a prototype really, not the smartest choice.

they got the tree axes gyro, now someone should tell them about bail out, for real, anyway, one follower arm lets go, what happened to redundancy dear sirs WHAT HaPPENED?
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01-09-2015 07:09 AM  5 years ago
Ben1986

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Birmingham

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horrible accident, luckily they survived
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01-09-2015 03:07 PM  5 years ago
JasonJ

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North Idaho

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I could not believe how they turned a poor design into a "pitch" for a great helicopter. 
How is it a poor design? I would say the helicopter is a great design. They had a failure at altitude and survived. As the video stated a convention helicopter would most likely have broken up in flight. At the end of the video it states they have since gone to a double scissor link setup for redundancy. Hopefully they change manufacturers on that link system.
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01-09-2015 06:44 PM  5 years ago
dkshema

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Cedar Rapids, IA

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I did some digging around the web, it seems that the swashplate scissors -- the bit that drives the upper half of the swashplate and that maintains head phasing -- is a component that can and does suffer a single point failure, leading to loss of the aircraft.

There are at least two instances of Agusta/Westland AW-109s going down within 21 days of each other, in the UK (I believe), each the result of a single point failure in the swash driver/scissors.

The aircraft, I believe, were operated by the same people, and in both cases, the single bolt which failed had been improperly installed during maintenance (sounds like it was installed backwards). This led to the bolt undergoing excessive flexing (essentially at higher values of collective pitch, when cyclic was applied, the bolt/ball link hit a mechanical limit due to the incorrect bolt installation. The flexing led to "high cycle" stress, fatigue, and failure.

However, NEITHER aircraft disintegrated in flight, both were able to make somewhat of a controlled landing/crash, and although some people were injured, none were killed.

In both cases, the pilots first thought they had experienced dual-engine failure, and attempted to autorotate. As the phasing of the head changed, control became difficult, but not impossible. As the swash rotated and was limited by the pitch links, the overall collective pitch decreased, leading the pilots to think they had lost power, when instead, the collective pitch reduced, giving the impression of a power loss.

It appears that the helicopter industry accepts this type of failure possibility in their design.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Composite heli crash, walk away.
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