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HelicopterHIROBOOther › My Evo 50 blew up!
11-25-2006 10:35 PM  11 years agoPost 1
maller

rrVeteran

Bucks County, PA

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Definately the worst that's ever happened to me with my heli.

I was flying around, nothing fancy. About 20 feet off the ground. I heard a pop, and parts began flying all over the place!

Lots of damage - it looks destroyed.

The most troubling thing about this (more than the $$$$) is that I have no idea what happened. I really need to figure out what happened, so I can make sure it doesn't happen again.

The only possibility I recognize right now is something with the tailbelt. Perhaps, it snapped. The tail boom snapped right at the frame, but it's not bent. I'd think that if it broke on collision with the ground, it would be bent. But, it just snapped fairly cleanly and the whole tail ripped off. Looking at the inside of it, I can see that the tail belt did rub against the inside of the boom.

Question 1 - does that make sense? Could a tail belt rub or wear down until it snaps and cause all sorts of damage? Note - the tail belt was still inside the boom, so I don't know for sure if it could have been the cause. Any other ideas on what I should look for?

Question 2 - I'm thinking of just getting an entire new Evo 50 kit. I don't know how much damage I have. It may make sense to just start new. Are the new Evo's any different? I bought mine in February, 2004.

I guess everyone has a crash at some point that totals everything, so I'm trying not to let this discourage me.

Thanks!



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11-25-2006 11:31 PM  11 years agoPost 2
Eury

rrProfessor

Dover NH

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Generally crashes like that are because of either a link going to the grip failing, so the blades go way out of track and create an imbalance of sorts, and it tears itself apart. The other is when it throws a blade. I don't think a broken belt would cause it.

Nick Crego

Citizen #0168

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11-25-2006 11:42 PM  11 years agoPost 3
maller

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Bucks County, PA

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Thanks, eurylokhos. I looked at it, again, after ready your post. One pitch rod is detached from the blade holder. The rod end isn't broken, but the rod is bent. I'd think that if it popped off, the rod wouldn't be bent. But, do you think this is the culprit?



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11-25-2006 11:45 PM  11 years agoPost 4
Eury

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Dover NH

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Probably, it's the old woof and poof. Woof is the sound it makes when the blades go way out of track (which would happen if the link came off in flight), and poof is what happens to your heli. If you do a search, it was pretty common on the V1 Raptors, you might want to read up and see if it sounds similar.

Nick Crego

Citizen #0168

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11-26-2006 02:50 AM  11 years agoPost 5
GScott

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Lewis Center, OH

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Another cause of the woofs on a Sceadu is a loose frame screw. If the self tapping screws that hold the servo frame to the main frame are loose it will woof. Scared the crap out of me the first time it happened.

Has the heli been crashed before? I also had a blade go wildly out of track when the plastic seesaw had a hairline crack from a previous hard landing. Luckily I was able to land but I don't know how that blade didn't cause a boom strike.

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11-26-2006 02:50 AM  11 years agoPost 6
racer944

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Greely, Ontario - Canada

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Does the boom have a dent in it? If so it was likely sheared off by one of the blades striking it due to whatever caused the issue (like a link popping off the head or swash plate) and not by the crash or a failure of a tail part...

Its unlikely a belt failure would casue an accident in the manner you described.

Cheers;
Eric

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11-26-2006 04:44 AM  11 years agoPost 7
Eury

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Dover NH

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I also had a blade go wildly out of track when the plastic seesaw had a hairline crack from a previous hard landing. Luckily I was able to land but I don't know how that blade didn't cause a boom strike.
Are you talking about the flybar seesaw that the flybar goes through? Where did it have a crack? I just can't imagine that causing that kind of problem, unless it was where the arms attach that go to the grips.

Nick Crego

Citizen #0168

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11-26-2006 05:36 AM  11 years agoPost 8
Havoc

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Ky.

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That's the worst kind of crash when you can't be certain what really happened. If the tail failed first it would piro. I almost had a woof and poof. I changed the links on mine at the field and didn't think they were that tight. I notice during flight the noise change and my tracking went off and landed to find that ball on the grip barely hanging on. It apparently unscrewed the bolt. I sized the links and made sure I had a little CA on those threads.

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11-26-2006 12:53 PM  11 years agoPost 9
maller

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Bucks County, PA

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OK. I have wood blades. The one blade where the pitch rod link came is off the blade holder - that blade has a big dent in it, at the spot where it indicates that it could have gotten hit by the boom once separated. The blade is still attached. I don't know if that means anything or not.



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11-26-2006 01:43 PM  11 years agoPost 10
shlm

rrKey Veteran

West Chester, PA

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Maller,

Answer to your questions: (my opinions only)

1. Having a belt snap would not cause the heli to self destruct in any way. What would happen is that you would loose the control of your tail and is you do not power off the engine it will start to pirouette very fast as a result of the torque of the engine. The best thing you can do in this situation would to be hit the throttle hold and auto down.

2. What I do in the event of a really bad cash, hmmm I just bought a new kit a month ago, I buy a new kit and then overhaul the crashed one. I check everything out, replacing worn out parts, bearings, etc.

The new versions of the EVO kit now come with a set of MAH carbon main blades, this is in addition to the MAH carbon tails.

As for the cause of the crash (my opinions only), it sounds like something let loose in the head area (duh). I would check all of the ball links (are the worn out and pop off easily), that all of the balls are still attached (are they still there are any of them loose), any missing screws (washout arms, etc), etc. If any thing lets go from the swash up it typically will be a mess. Some sources of links popping off are worn out links, binding, or flutter. The first two are pretty obvious to check; however, flutter is not. What I have found for causes/sources of flutter on the EVO 50 are: bad blades, worn out links, loose balls, loose control arms, worn out servos, cheap servos, and/or anything else that introduces slop in the the control system. Please note I am referring to the EVO 50 and not the non-EVO 50 as Hirobo updated the design to help reduce flutter. For example, just yesterday at the field I was helping out another pilot and I could hear his blade goinging a tad out of track. I checked the heli out and found 4 loose balls (both flybar mixing arms). This intoduced a bit of play/slop at the blade grips allowing them to not track. It was not a lot but enough to the point that I could hear it happening.

The dent in the blade would have been a result of the blade kicking down and clipping it, especally being the link popped off. I doubt that the boom came off first and then hit the blade.

Hope this helps. Also I see that you are somewhat local, so if you need any help let me know.

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11-26-2006 01:57 PM  11 years agoPost 11
rudyy

rrElite Veteran

E. Amherst, NY

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One of your ball links in your head might have been loosened. Did you have another crash before this one?

This is very scary. On top of the preflight check, a regular detailed check to make sure no screws and ball links are loosened up is necessary.

Rudy

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11-27-2006 12:32 AM  11 years agoPost 12
Leif

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USA

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Were you running stock dampeners? How recently did you change them? Some people are not aware that dampeners need to be changed on a regular basis as they wear over time and develop slop.

Worn stock dampeners on the Evo head can easily produce woof-n'poof. I suspect you had a boom strike. A new kit is probably the best way to go.

Leif

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HelicopterHIROBOOther › My Evo 50 blew up!
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