RunRyder RC
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 1560 views POST REPLY
HomeAircraftHelicopterHelicopter Main Discussion › Composite heli crash, walk away.
01-08-2015 05:38 AM  3 years agoPost 1
Machinehead01

rrVeteran

Lower Michigan

My Posts: All  Forum  Topic

http://vimeo.com/115532128

Lucky to have lived through this one!!!

"You judge according to the flesh; I am not judging anyone."

PM  EMAIL  GALLERY  Attn:RR  Quote
01-08-2015 05:49 AM  3 years agoPost 2
ICUR1-2

rrElite Veteran

Ottawa, Ontario

My Posts: All  Forum  Topic

thanks for sharing

carbon blades are expensive. I wonder what a carbon fiber heli is worth

spending time, paying attention

PM  EMAIL  GALLERY  Attn:RR  Quote
01-08-2015 10:02 AM  3 years agoPost 3
FastR1Red

rrApprentice

Melbourne Australia

My Posts: All  Forum  Topic

Great video, good find. Were they from New Zealand?

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
01-08-2015 01:27 PM  3 years agoPost 4
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

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! *

Team Heliproz

PM  EMAIL  GALLERY  Attn:RR  Quote
01-08-2015 02:49 PM  3 years agoPost 5
Machinehead01

rrVeteran

Lower Michigan

My Posts: All  Forum  Topic

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

Tom

"You judge according to the flesh; I am not judging anyone."

PM  EMAIL  GALLERY  Attn:RR  Quote
01-08-2015 03:31 PM  3 years agoPost 6
rcflyerheli

rrKey Veteran

Granbury, TX USA

My Posts: All  Forum  Topic

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
Amain Team Rep

PM  EMAIL  GALLERY  Attn:RR  Quote
01-08-2015 03:52 PM  3 years agoPost 7
RM3

rrElite Veteran

Killeen, Texas - USA

My Posts: All  Forum  Topic

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...

PM  EMAIL  Attn:RR  Quote
01-08-2015 03:56 PM  3 years agoPost 8
shawmcky

rrElite Veteran

Isle of Wight,United Kingdom

My Posts: All  Forum  Topic

Team- unbiased opinion.K.I.S.S principle upheld here

PM  EMAIL  GALLERY  Attn:RR  Quote
01-08-2015 04:19 PM  3 years agoPost 9
cdrking

rrElite Veteran

Seattle

My Posts: All  Forum  Topic

I pooped my pants watching that.

To hover is divine, the alternative is rather PLANE.

PM  EMAIL  GALLERY  Attn:RR  Quote
01-08-2015 04:29 PM  3 years agoPost 10
SuperSixTwo

rrVeteran

Virginia City, NV ---USA

My Posts: All  Forum  Topic

Talk about an E ticket ride. Wow.
I wonder what a carbon fiber heli is worth
Two lives right now!

PM  EMAIL  GALLERY  Attn:RR  Quote
01-09-2015 12:56 AM  3 years agoPost 11
EEngineer

rrProfessor

TX

My Posts: All  Forum  Topic

Is what they called a "scissor link" similar to the anti-rotation bracket on our helis?

PM  EMAIL  Attn:RR  Quote
01-09-2015 01:29 AM  3 years agoPost 12
EEngineer

rrProfessor

TX

My Posts: All  Forum  Topic

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.

PM  EMAIL  Attn:RR  Quote
01-09-2015 01:30 AM  3 years agoPost 13
ICUR1-2

rrElite Veteran

Ottawa, Ontario

My Posts: All  Forum  Topic

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

PM  EMAIL  GALLERY  Attn:RR  Quote
01-09-2015 01:41 AM  3 years agoPost 14
EEngineer

rrProfessor

TX

My Posts: All  Forum  Topic

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.

PM  EMAIL  Attn:RR  Quote
01-09-2015 01:43 AM  3 years agoPost 15
ICUR1-2

rrElite Veteran

Ottawa, Ontario

My Posts: All  Forum  Topic

agreed very lucky

spending time, paying attention

PM  EMAIL  GALLERY  Attn:RR  Quote
01-09-2015 02:42 AM  3 years agoPost 16
Glenn Goodlett

rrApprentice

California

My Posts: All  Forum  Topic

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.

PM  EMAIL  GALLERY  Attn:RR  Quote
01-09-2015 03:15 AM  3 years agoPost 17
icanfly

rrElite Veteran

ontario

My Posts: All  Forum  Topic

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?

PM  EMAIL  GALLERY  Attn:RR  Quote
01-09-2015 07:09 AM  3 years agoPost 18
Ben1986

rrNovice

Birmingham

My Posts: All  Forum  Topic

horrible accident, luckily they survived

PM  EMAIL  Attn:RR  Quote
01-09-2015 03:07 PM  3 years agoPost 19
JasonJ

rrKey Veteran

North Idaho

My Posts: All  Forum  Topic

My Posts: All  Forum  Topic

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.

PM  EMAIL  GALLERY  Attn:RR  Quote
01-09-2015 06:44 PM  3 years agoPost 20
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

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

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 1560 views POST REPLY
HomeAircraftHelicopterHelicopter Main Discussion › Composite heli crash, walk away.
 Print TOPIC  Make Suggestion 

 7  Topic Subscribe

Thursday, November 15 - 12:52 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online