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06-06-2011 03:07 AM  8 years ago
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helismash

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Gloversville, NY - Fulton

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Unexplained Crash
Ok guys and gals, I had something very wierd happen today that I can't explain. First let me start by saying that last week I was flying my 700N around for the first time with the BeastX. I had an engine fail and ended up rebuilding it.
I was at the field today and had done a hover flight. This was the 5th hover flight in two days and it was very rich. I leaned it off a little and went out for another flight. I flew around for a couple minutes and then went to idle 1. I was just kind of hovering around for about 30 seconds when the cyclis started to feel very strange. The heli started to lean to the left so I corrected right. At that point it sort of started to wobble but then went hard left and I could not correct it fast enough. I hit hold trying to minimize what I knew was going to be a crash. Needless to sat it hit the groung fairly hard. Only damage was two bent links from the blade grip to the swash (Both bent and poped off) and one blade struck the ground.
Some of the guys said it looked like the blades were doing funny things. When I look at the damaged blade, it is split down the seam where the two blade halves come together.
My question is, could a blade have come apart like this in flight and has anyone ever had this type of unexplained crash. I sure could use some ideas as I can't afford to keep replacing blades.

Thanks Guys
Hey, Who put the ground there!
T-Rex 500/T-Rex 600N FBL/T-Rex 600E PRO/T-Rex 700N/T-Rex 700FBL
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06-06-2011 03:15 AM  8 years ago
Raptorz499

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NJ

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Sounds like a link came off?
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06-06-2011 03:18 AM  8 years ago
helismash

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Gloversville, NY - Fulton

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I was thinking that as well. I popped them back on just to see how they fit and they felt ok but who knows.Hey, Who put the ground there!
T-Rex 500/T-Rex 600N FBL/T-Rex 600E PRO/T-Rex 700N/T-Rex 700FBL
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06-06-2011 03:18 AM  8 years ago
cmsilvoy

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Durham, NC

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Yep, blade delamination is entirely possible.
Can you give us a history of the blades?
Were they new?
What brand were they?

Most blades on the market now are very good, but I am sure quality control lets some problem blades slip by.

Chris
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06-06-2011 03:25 AM  8 years ago
helismash

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Gloversville, NY - Fulton

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They were Align blades. They were not FBL blades. I got them with the heli when I bought it used around December. They liiked to be in good shape.
I was to busy trying not to crash to notice what they were doing but like I said, one of the plankers said the blades looked funny. He said "it looked like one droped". That statement made me wonder.
Hey, Who put the ground there!
T-Rex 500/T-Rex 600N FBL/T-Rex 600E PRO/T-Rex 700N/T-Rex 700FBL
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06-06-2011 03:47 AM  8 years ago
jbiter

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Sebring, FL

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I have had a Vbar equipped heli bank hard right in idle up. High vibration levels were the culprit there. I think BeastX has a vibe log now if you have updated your unit recently. Might be worth a look.

Jeff

EDIT Skookum was the unit I was thinking about which recently added a vibe log. I don't know if Beast has anything like that.
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06-06-2011 12:46 PM  8 years ago
mylee

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Rochester, UK

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We had an un explained crash at our field last year. Same situation, but the heli pitched violently upwards in FFF and then went in hard. We couldn't decide if a link had popped off or the blade had delaminated. Again, align blades and one had split perfectly down the seem.
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06-06-2011 12:49 PM  8 years ago
helismash

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Gloversville, NY - Fulton

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Yah, that's what I am seeing as well. It's hard to tell as that blade also hit the ground but if you look at it, the split is perfectly along the seam. I thought it may be due to the crash but I cant explain why the heli got all funny acting and very pitch and roll sensitive for no good reason.Hey, Who put the ground there!
T-Rex 500/T-Rex 600N FBL/T-Rex 600E PRO/T-Rex 700N/T-Rex 700FBL
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06-07-2011 03:36 AM  8 years ago
titanchin

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Malaysia

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BeastX tilt one side
I have the same problem try pitch on ground. it wil turn to tilt one side sometime. i need to restart only work ok.:-)?
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06-07-2011 03:43 AM  8 years ago
helismash

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Gloversville, NY - Fulton

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titanchin,
Interesting, I have not seen that yet. I do however perform the usual FBL checks before I fly.
Hey, Who put the ground there!
T-Rex 500/T-Rex 600N FBL/T-Rex 600E PRO/T-Rex 700N/T-Rex 700FBL
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06-07-2011 03:52 AM  8 years ago
theriddick45

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United States

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Did you check your connections?

I had one crash on a predator the aileron cable came lose after 4 flights hovering and doing some rolls and loops...
Suzi Janis 800e & 700e 3blade both w/Ikon
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06-07-2011 03:55 AM  8 years ago
helismash

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Gloversville, NY - Fulton

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Yep, I checked every connection and I use hot glue to hold the connections in the RX, regulator and BeastX. I like the hot glue because it holds wel and I can peel it off when I need to. I can post pics if needed.Hey, Who put the ground there!
T-Rex 500/T-Rex 600N FBL/T-Rex 600E PRO/T-Rex 700N/T-Rex 700FBL
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06-07-2011 05:22 PM  8 years ago
theriddick45

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United States

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That's cool hot glue. I use Scott tape heavy duty exterior grey is very gummy stick hard and absorb vibes very good and is fairly ease to take off leaving no residue on the surface.Suzi Janis 800e & 700e 3blade both w/Ikon
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06-07-2011 05:51 PM  8 years ago
helismash

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Gloversville, NY - Fulton

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Here are a couple of pictures of the setup. I know it's not as neat as it could be and I am open for suggestions to make it better. I took these pictures before I put the hot glue on the connectors.

Hey, Who put the ground there!
T-Rex 500/T-Rex 600N FBL/T-Rex 600E PRO/T-Rex 700N/T-Rex 700FBL
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06-07-2011 07:36 PM  8 years ago
GetToDaChopper

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Las Vegas , NV

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idk looks pretty neat to me, you might want to have a little slack in the cables going into the beast, sometimes having the cables tiewraped so close to a gyro can send funny vibs into the gyro along the cable connections right to the gyro board itself. i see that the tiewarp closest to the beast might be tapping (vibrating off of) on the scottys (reactorX2) case ?    ▲
  ▲ ▲
▲ ▲ ▲ One of a Kind !!!
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06-14-2011 04:11 AM  8 years ago
SkySurfer

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usa

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I had my Radikal do a unexplained hard left into the ground, and a loss of tail authority before. Watch the leds while the engine is running. If the leds start to jump around on the display,then the micro beast is telling you that the vibes are too high.
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06-14-2011 01:43 PM  8 years ago
NitroAl

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Gold Coast Aus

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Im with GTDC, I like your atention to detail but I think that large bunch of leads hanging to one side could be a problem. If you have any vibrations the energy will be magnified to one side. Consider running your leads strait out of the beastX atleast to the far side of the Scott Gray and cusion the contact area with double sided foam tape or sticky back velcro.
I run two TotalG's and had a similar problem for this very reason, I had the leads running forward but bunched and tied to the inside of the left frame side. When the leads are bunched they become rigid, once I gave the leads some seperation by running them more like a set of header pipes my cyclic problems where gone.

P.S I don't know how many of those DS921 servo's you are running in your heli but if anything is affected by vibration more than an FBL unit it is those servo's! Ditch them befor they ditch your heli ;-)
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06-14-2011 02:42 PM  8 years ago
povern

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LF, MN

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Can you put a metal plate under the MB to help stop vibratons?Screw It, I'm gonna fly
Synergy E5, E5s and Logo 800 xxtreme
vControl and Neo
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06-14-2011 02:47 PM  8 years ago
helismash

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Gloversville, NY - Fulton

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Thanks guys. I wil re route the wires and use some foam to insulate them. The DS821 is only on the throttle but I am going to change that out as well. The cyclic servo's are 8717's which I figure should be a pretty good servo for the job.Hey, Who put the ground there!
T-Rex 500/T-Rex 600N FBL/T-Rex 600E PRO/T-Rex 700N/T-Rex 700FBL
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06-14-2011 02:58 PM  8 years ago
ssrobzoom

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Tn

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Where the Align blade like these?

Look here: Product Bulletin

http://www.horizonhobby.com/Product...odID=AGNH600CFW
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