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T-REX 700 › 700E DFC LINK FAIL?
09-19-2013 04:12 PM  5 years agoPost 1
Gman33

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Sanford Maine

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thought i would share this with all the rest of you heli guys out there....i will post the vid on youtube later this week............so
after a great 4th flight on my new 700E DFC HV brought her in for one of the softest landings ever hit the throttle hold and BOOM
next thing i know the tail is missing.....sucks right.....not quite (the positive side is i am able to see exactly what failed on the heli)....i was surprised to see my heli still in mint shape (except for the affected parts (1 DFC LINK /1 BLADE / BOOM & TT) i have heard a lot of talk about DFC links having trouble and brushed it off as typical difference of opinion....well i might have been wrong.....after careful inspection of the helis affected parts by a vary qualified pilot and engineer it is more than likely i experienced a DFC LINK FAILURE.
Please look at pics below and tell me what you think
i called align regarding this and they had nothing to say.....other than that's weird.
unlike most issues it can be hard to asses what the cause of a failure is due to other damage received in a crash.....but lucky for me i was on the ground and had just hit hold so only affected parts are damaged....the top of the affected blade has a slit punched through it and the line of the angle would put the affected blade in the neighborhood of -140 DEG pitch when impact occurred mechanically impossible unless blade was not attached to swash-plate.....also there is are small dents and scratches on the affected side of the swash.....but nothing on the other side.
no mystery here.....hoping align will do the right thing and replace the parts....but not holding my breath.....just hoping all you readers will think twice before standing of flying to close
to a machine of this size...this is the 3rd DFC heli i have seen pop in 4 weeks....2 were goblins and my dfc... after inspection i would speculate the goblins were due to plastic in the dfc links....the plastic was obviously broken on the link and they had just popped in a backwards inverted hurricane......vary scary for pilot & Spotter....trust me.
im sure this will spark conversation.....anyone else experience something like this?....these are powerful machines and in my opinion even a few incidents like this are to many...this was my first head grenade and it will be my last.....going back to old FBL head......imagine how this could play out airborne at a packed event or mid flight in close proximity flying like some of the big boys do......keep safe.
PS.....flew like a dream before the incident....loved it

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09-19-2013 05:13 PM  5 years agoPost 2
qraptor

rrApprentice

Illinois

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Thanks for posting.

Do you have any picks of the head and the links?

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09-19-2013 06:38 PM  5 years agoPost 3
Dino Spadaccini

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USA

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First this sucks and i never like to see this happen with a new heli, can you please tell me when you bought this kit and from who,
i like to get more info

I like to say this first i am going to ask alot of questions on setup etc, also i am not blaming or saying its you i just need to be sure of all the info.

i dont see any pictures of the link that you said failed

the link cant just pop off the ball its held in place by the arm that bolts to the grip arm the only way to remove the link from the ball is to unbolt the link arm then use a ball driver to remove the link from the swash ball.

the first question i have is how tight where the main blades you cant run them loose so they fall under there own weight when the head is spooling down a blade can lag hitting the boom and cause alot of damage where you aware of this.

RIP Roman JR
Capt USA Align Factory Team Align - Conquer Your heart
Team Futaba

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09-19-2013 07:26 PM  5 years agoPost 4
Dino Spadaccini

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USA

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brought her in for one of the softest landings ever hit the throttle hold and BOOM
I think we need to talk about this more I have never known anyone to bring a E 700 in for a landing under full power. Doing so can cause problems with your FBL unit, what do i mean by this once you touch down under full power the FBL unit thinks the heli is still flying and will do what it needs to keep it flying what i feel happen here is that when you touched down under full power no matter how soft the FBL just keep trying to fly the heli and will give an input and mostly likely caused the boom strike and with a head speed say of 2150 things happen in a flash.

Dino

RIP Roman JR
Capt USA Align Factory Team Align - Conquer Your heart
Team Futaba

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09-19-2013 07:41 PM  5 years agoPost 5
steph280

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Irvine, California

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So you posted a lot of detail photos of the damaged parts, but where are the photos for the head and failed link? We'd all like to see exactly what failed.

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09-19-2013 09:21 PM  5 years agoPost 6
Gman33

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Sanford Maine

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I will post some more pics Friday
As for head speed Esc was at 40% in norm...not really screaming in my opinion
the blades on all my helis are not loose but not tight....this is not my first heli.
I have a fleet ranging from 100-700 including my trex 600 nsp ...personal fave... still flying after 5yrs.....like I said I will post more pics....but I don't see how the blade could get at that angle while attached to the swash.....and I don't see the blade swinging forward enough to strike the boom from deceleration like that.... there are no scurf marks on the blade just a spit blasted through by the horizontal stab.....its totally possible it was just a bad link or something else head/grip related.....but the only damage on the heli indicates swash up issue in my opinion.....all others are welcome....I am not trying to bash align my fleet is 90% align...kick ass helis I just thought it was worth sharing the story as a reminder that........#hit happens
Something we should all remember.

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09-19-2013 09:25 PM  5 years agoPost 7
Dino Spadaccini

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USA

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I have a few more questions

why are the bolts on the boom clamp loose

why are you showing a carbon wrap boom in your hand and you have a metal boom on the heli still

Are you saying the boom survived impact from a boom strike when you landed.

please clear this up for me thanks Dino

RIP Roman JR
Capt USA Align Factory Team Align - Conquer Your heart
Team Futaba

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09-19-2013 09:27 PM  5 years agoPost 8
AlignRC

rrApprentice

Taichung, Taiwan

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Please send photos
Hello I've seen the pictures you have posted but wanted to ask. You show a carbon boom broken and then a aluminum boom in your shot with the damaged blades. Also would like to see the rotor head and swash. From the look of the blade the impact came from the leading edge while resulting in the de-lamination of the trailing edge. Also the cut on the top of the blade looks really clean. I'm amazed that the boom, boom supports and torque tube held under the pressure of that side impact. Please send your photo high resolution to Tim@alignrcusa.com.

Best Regards,
Jeff Fassbinder
Align

Align - Conquer Your heart

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09-19-2013 09:38 PM  5 years agoPost 9
Gman33

rrNovice

Sanford Maine

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Yes I put the Alu boom on to show the position the stab went through the blade...I am amazed that the stab did not break....but the it did take the boom off just inside the front tail case and bent it just before the horizontal Stab.......good carbon.... I will pull it out and take some more pics of it....I am putting the old fbl ball link head on....don't want to be worried about it while I fly....other than this issue.....as far as performance....the 700e is like a sore Dink.....cant beat it

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09-19-2013 09:41 PM  5 years agoPost 10
Gman33

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Sanford Maine

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Oh and the boom supports & TT did not make it......RIP
Supports broke at the pod just behind the screws.

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09-20-2013 12:52 AM  5 years agoPost 11
ncarbon

rrApprentice

Kalispell Montana

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Subscribed
I have nearly 1500 flights on my 700e V3 DFC. I realize that on the forums these issues rise right to the top, and for most and me, I haven't had any issues. I am very interested and concerned with 'Link' failure. Please post pictures and perhaps, send off the 'Links' for ALIGN to evaluate.

Ned

It is............what it isn't!

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09-20-2013 01:42 PM  5 years agoPost 12
tgalo

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USA

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for most and me, I haven't had any issues. I am very interested and concerned with 'Link' failure. Please post pictures
Ditto, I'd love to see photos. How in the world can they come off??

Gravity's a bitch ant it?

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09-24-2013 05:11 PM  5 years agoPost 13
MickeyJohnston

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Ontario, Ca

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nevermind

Mickey

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09-25-2013 04:08 PM  5 years agoPost 14
ADHD

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Jacksonville, FL

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Probably got over 50 flights on my new 700 Pro using the DFC head and never a problem. I do keep a close eye on all the links and head before and after every flight, but I do that on all my heli's.

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09-25-2013 04:25 PM  5 years agoPost 15
knightofcarnage

rrElite Veteran

chicago

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Love to see the video. Also how far did you screw in the links. Like to see how the links where assembled. Do you have any pictures before.

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09-25-2013 04:32 PM  5 years agoPost 16
grim.the.grim

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Houston, Texas

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I'm subscribing...very interested in how Align will deal with this.

I do think it is neat that Align has already responded and asked follow up questions.

*** Real Pilots BEAT the air into submission! ***

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09-25-2013 06:37 PM  5 years agoPost 17
Zaneman007

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Texas - USA

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Confused
So you are saying that you rebuilt the tail boom, supports, carbon fiber push rods, everything. Then staged some photos, to show what you perceived happened.

And you didn't take any photos of the actual damaged heli or so called defective part prior to the rebuild?

And I don't see how the tail boom snapped as shown in your hand per your recreation. Where did it break?

Old Guys Rule!

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09-25-2013 09:35 PM  5 years agoPost 18
ADHD

rrApprentice

Jacksonville, FL

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I know you said you will post more photo's on Friday, but why wait so long? Did you not have photos for the original problem that you took?

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09-25-2013 11:51 PM  5 years agoPost 19
Dino Spadaccini

rrElite Veteran

USA

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guys we asked and nothing, read the sentence where he said he came in under power touched down hit hold and boom most likely once the fbl felt that it put an input in and the rest is history its more than a week from when this happen so

RIP Roman JR
Capt USA Align Factory Team Align - Conquer Your heart
Team Futaba

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