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Compass Knight 50 > Stock Ball links failure??Anyone???
 
 
epc2
Senior Heliman
Location: Miami , Fl./S.Dgo.

Just want to know if any of you guys here have had any ball link failure with your stock ball links on your K503d.

On Sat. while I was flying my 3d , I had a bad boom strike in flight and I had nothing to do than just hit hold and watch the heli fall from 100ft.

After an inspection I found out that the ball links that goes from the blade grios to the Fbar arms broked and that's the only thing that could cause a boom strike other than the dampers and I have K&B yellow ones mounted since the stock ones had a lot of play after just a gallon.

I still haven't found the tail assembly from the impact and as you can imagine the pic was not nice at all.

IMHO Compass should address this issue and check the material used on their ball links , I think that this heli flies very well but I can't accept the fact that I lost a model , blades,pipe and lots of $$ due to a poor part.

epc2.



Team My Wallet.
02-18-2008 05:49 PM
 
 
Jon the Rooster
Elite Veteran
Location: Johns Island, Charleston, SC

No Problems here.
Started to like the compass links since I got the compass link resizing tool.

and one more thing "DON'T BE AFRAID!"
02-18-2008 08:25 PM
 
 
Adey_Law
Senior Heliman
Location: Bournemouth, UK

only ever seen one do that in a crash. certainly wasnt the cause of the crash.

i dont use the resizing tool they bed in after a few flights and last for ages.

Ade
02-18-2008 08:31 PM
 
 
Tradhunt
Senior Heliman
Location: American Canyon, Ca. USA

No problem's here as well. never used a resizing tool never seemed to have the need for it.
02-18-2008 08:41 PM
 
 
helimatt
Key Veteran
Location: Lafayette, IN

Quote 
certainly wasnt the cause of the crash

I'm curious as to why you make that assertion with such certainty- a broken link could have caused the blade strike but of course, a blade strike could cause the link to fail as well.

Not disagreeing, just trying to understand where you are coming from.

Never, ever, ever, ever give up.
02-18-2008 09:19 PM
 
 
casper7
Senior Heliman
Location: UK southeast

I had one that had split on mine, no crash involed just split, lucky I found it on the pre-flight check
02-18-2008 10:20 PM
 
 
Adey_Law
Senior Heliman
Location: Bournemouth, UK

the crash in question was me having too much fun just a little too low and roostering it :-)

Ade
02-18-2008 10:56 PM
 
 
epc2
Senior Heliman
Location: Miami , Fl./S.Dgo.

Quote 
I'm curious as to why you make that assertion with such certainty- a broken link could have caused the blade strike but of course, a blade strike could cause the link to fail as well.

Not disagreeing, just trying to understand where you are coming from.


Cuz I was the one flying the heli and watched it fall down with the blades folded back and the only two reasons why a boom strike can happen are too soft dampers or a link failure like this and my dampers are good not worn out at all.

epc2.

Team My Wallet.
02-19-2008 02:13 AM
 
 
helimatt
Key Veteran
Location: Lafayette, IN

Ooh, sorry, I was responding to Adey Law's post but misunderstood that he was referring to a different crash.

I wonder- did the heli have any crashes or tip overs that might have stressed/cracked the link previously?

Never, ever, ever, ever give up.
02-19-2008 02:35 AM
 
 
Rodney
Veteran
Location: Tavares,Florida

Even with the stock dampers extremely worn out I do not think the heli will boom strike under the normal hard 3D flight conditions.
The Delrin does not allow that much movment in the spindle. Unless blades fold.
Yes there are pilots out there that can boom stike any heli if they want to..

Dx7 With Ion Power Supply. Why use anything else.
02-19-2008 02:49 AM
 
 
epc2
Senior Heliman
Location: Miami , Fl./S.Dgo.

Quote 
I wonder- did the heli have any crashes or tip overs that might have stressed/cracked the link previously?


No probl. No no previuos crashes or hard landings.

Quote 
Even with the stock dampers extremely worn out I do not think the heli will boom strike under the normal hard 3D flight conditions.
The Delrin does not allow that much movment in the spindle. Unless blades fold.
Yes there are pilots out there that can boom stike any heli if they want to..

Yeah I agree on the dampers then the only possible option for the boom strike is the ball link failure.Or do you have something else in mind?? I don't think that there's another reason that could've caused the Bstrike.

epc2.

Team My Wallet.
02-19-2008 03:31 AM
 
 
TonyTypeS
Key Veteran
Location: New Orleans, LA

Same thing happened to my knight 3D I first got it. I was out doing flips when all of a sudden the blades folded back in struck the boom. The heli blew apart and everything seemed like it was in slow motion when I was watching peices fall from the sky

From this day on I never knew what happened. The head was all torn up and the links were broken just like yours. I upgraded all my links to rocket city links and never had that problem again. However at a funfly last year I had the blades hit the boom when I was doing piro flips. I was able to land it with no damage done and found a nice mark on my boom The guys were saying the high winds may have caused it but I think I was giving too much cyclic stir and pitch. Even though I was barely stiring the sticks. This happened twice because I wanted to see if it was really pilot error Than I'm wondering if I was bogging the HS allowing the blades to fold back but who knows what really happened

My pitch was set at +/- 12 and the cyclics were between 7-8

I was running the same setup on my Zero G raptor and never had that problem

Must have more POWER!
Avant FX
Fueled by addiction
02-19-2008 04:38 AM
 
 
epc2
Senior Heliman
Location: Miami , Fl./S.Dgo.

Quote 
Same thing happened to my knight 3D I first got it. I was out doing flips when all of a sudden the blades folded back in struck the boom. The heli blew apart and everything seemed like it was in slow motion when I was watching peices fall from the sky

From this day on I never knew what happened. The head was all torn up and the links were broken just like yours. I upgraded all my links to rocket city links and never had that problem again. However at a funfly last year I had the blades hit the boom when I was doing piro flips. I was able to land it with no damage done and found a nice mark on my boom The guys were saying the high winds may have caused it but I think I was giving too much cyclic stir and pitch. Even though I was barely stiring the sticks. This happened twice because I wanted to see if it was really pilot error Than I'm wondering if I was bogging the HS allowing the blades to fold back but who knows what really happened

My pitch was set at +/- 12 and the cyclics were between 7-8

I was running the same setup on my Zero G raptor and never had that problem


Well now at least I know I'm not alone and that this has happened before , I was also running12deg of pitch and 7 on cyclics.

epc2.

Team My Wallet.
02-19-2008 04:50 AM
 
 
TonyTypeS
Key Veteran
Location: New Orleans, LA

One of my other buddy down here also had a mid air boom strike. The blades caught the horizontal fin during flight and also caused him a crash. I was dissapointed in my crash as it wasn't cheap but the heli does fly pretty good

I guess blade strikes can happen to any one at any time. It can be due to number of things and be hard to figure out. Links usually break in a blade strike so it's hard to determine what caused the crash unless you have good eyes I seen a Vibe blow apart in flight and it wasn't pretty.

Must have more POWER!
Avant FX
Fueled by addiction
02-19-2008 05:08 AM
 
 
Apples
Senior Heliman
Location: Brooklyn, New York

No, you are not alone...A similar thing ocurred to me at the end of the summer... I was doing slow circuits about 15' up and, as I made a left hand turn towards myself, I heard a "ping" and the heli stood up on the tail. I hit throttle hold, and, unfortunately, brought it in on it's nose...

Upon inspection on the bench, I found the usual damage to the boom, main shaft, spindle and output shaft, flybar and blades..But, I also found that the ball links to the grips had cracked...I just assumed that it was poor throttle management on my part because I had no way to determine whether the ball links cracked before or after the crash.

I did change the links to Rocket City though, as a previous poster did.
02-19-2008 05:25 AM
 
 
Girard Ibanez
Senior Heliman
Location: Tucson, Arizona (formally from Guam)

Some times boom strikes are caused by a low head speed and poor collective management during the 3D manuever, Been there years ago.

Also, during cold weather environment, removing and inserting a ball link can cause extreme fatigue on the link. Keep in mind that contraction occurs when an item is cold. I also broke a link this way.

It can happen to any heli.



If it doesn't Hover, it Sucks or Blows.

MyRaptor.net Guam USA
02-19-2008 05:46 AM
HOMEPAGE  
 
 
epc2
Senior Heliman
Location: Miami , Fl./S.Dgo.

No cold weather here so that's out of the question and the heli had only 2gallons so it wasn't worn out either.

I'll like to hear what Compass have to say about this issue.

Tks,

epc2.

Team My Wallet.
02-19-2008 02:42 PM
 
 
A129
Senior Heliman
Location: Home

Ok reason is then poor collective management
02-19-2008 03:35 PM
 
 
MLINVILLE
Heliman
Location: Brighton, Co

I am curios as to what maneuver you were doing when you lost the link. I have a friend that lost a Raptor 50 to a bad ball link as well on the blade grip and that made for a big mess as well and all he was doing was hovering.

Mike
02-19-2008 04:12 PM
 
 
SteveH
rrProfessor
Location: Texas

I've had the links fail just like the one in your picture, but mine was the result of a crash.

SteveH
Magnum Fuel
AMA76186
02-19-2008 05:26 PM
 
 
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Compass Knight 50 > Stock Ball links failure??Anyone???
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