RunRyder RC
 5  Topic Subscribe
WATCH
 1 page 1111 views
HelicopterMain Discussion › Fury crash - Cause questions
06-01-2004 12:15 AM  13 years agoPost 1
RotorHead486

rrKey Veteran

England

My Posts: All  Forum  Topic

Hiya all,

Just had a bad day with my new fury, i was hovering on my second flight of the day just running in the engine when the heli just tipped violently to one side, i think i had some control as i managed to level it out some what but it continued to tip which as it was only hovering at low level caused the blades to hit mother earth, the heli just fell over on it's side.

The damage is blades/Flybar/Feather shaft/Main shaft, there is no drive to tail but untill i get the boom off tomorrow i don't know if it is damaged or it has just pulled out of the holder as the boom was twisted from the inpact.

Also one of the JR 8301 digital servos used for CCPM on the exhaust side lower mount position is damaged, the gears are shot.

I am a little P'd off at this as i don't know the exact cause of this crash, could it be the servo that has failed? or the Rx, the Battery, switch or even the TX which is a new JR PCM9X. The damage that has been done to the servo has this been done in the impact or has the servo failed and caused the crash.

Has any of you had any thing like this happen to you? any of you had any problems with the JR 8301 servo?

Cheers!
Rotorhead486

One Reason For Crashing'Rogue Servo Bent on World Domination'!!
FLP Flight Team

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
06-01-2004 12:22 AM  13 years agoPost 2
psawya

rrKey Veteran

Woodinville, WA

My Posts: All  Forum  Topic

If the gears are stripped, I would suspect that it happened in the crash, not the cause of it.

Regards,
Pete

PM  EMAIL  GALLERY  Attn:RR  Quote
06-01-2004 12:27 AM  13 years agoPost 3
RotorHead486

rrKey Veteran

England

My Posts: All  Forum  Topic

Hiya,

Yeah! that was out thoughts also but what could have caused the heli to tip violently from a stable hover?

This is worrying me know!

Cheers!
Rotorhead486

One Reason For Crashing'Rogue Servo Bent on World Domination'!!
FLP Flight Team

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
06-01-2004 12:29 AM  13 years agoPost 4
Dan C

rrApprentice

Barnsley, Yorkshire

My Posts: All  Forum  Topic

crap pilot ?

PM  EMAIL  GALLERY  Attn:RR  Quote
06-01-2004 12:48 AM  13 years agoPost 5
Jeff H

rrKey Veteran

Cincinnati, OH

My Posts: All  Forum  Topic

I've had the bolt holding the washout arm come off a couple of times. You loose about 80% of your control authority.


PM  EMAIL  GALLERY  Attn:RR  Quote
06-01-2004 01:20 AM  13 years agoPost 6
RotorHead486

rrKey Veteran

England

My Posts: All  Forum  Topic

NO washout arms check out ok!! thanks anyway.

It was a failure of some sort Dan nothing to do with pilot skills!!

Cheers!
Rotorhead486

One Reason For Crashing'Rogue Servo Bent on World Domination'!!
FLP Flight Team

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
06-01-2004 01:22 AM  13 years agoPost 7
Christian

rrApprentice

Boston, MA

My Posts: All  Forum  Topic

.

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
06-01-2004 01:53 AM  13 years agoPost 8
vitek

rrKey Veteran

Corvallis, OR

My Posts: All  Forum  Topic

the heli just tipped violently to one side, i think i had some control as i managed to level it out some what but it continued to tip
Very high probability that this problem is servo related, but I would also suspect the battery/switch. You may want to pull the servos out, and double-check the wires for chaffing. Check that the wires aren't pulling out of the servos too.

If the servo on the right goes out, the heli will roll quickly to one side. It will feel like you have some control, as the other two servos will still allow you to get some collective, elevator and some aileron inputs.

Travis

PM  EMAIL  GALLERY  Attn:RR  Quote
06-01-2004 01:57 AM  13 years agoPost 9
Heli-Driver

rrElite Veteran

Arlington, TX

My Posts: All  Forum  Topic

Sounds like a swashplate hardover, I'd send her in and get it checked...

Seriously, sorry to hear of your "problem".

I had my Fury Extreme sitting opn the deck at running RPM and it did the same thing, it was caused by a faulty voltage regulator, the voltage dropped enough to cause a servo to hard over.

It was not RF interference or a chaffed wire or even a bad servo in my case however those can also be a source of that type of problem.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
06-01-2004 01:59 AM  13 years agoPost 10
vetrider

rrElite Veteran

Daleville, AL (Ft.Rucker)

My Posts: All  Forum  Topic

You probley had a glitch as it usually effects the Channel #1 on your RX. On your JR RX I'm not sure what it is but most are the ROLL channel.

Anything metal to metal slightly loose will cause glitching...low battery...just about anything not normal.

Good luck finding the problem....those type of deals suck.

Nolan

PM  EMAIL  GALLERY  Attn:RR  Quote
06-01-2004 02:06 AM  13 years agoPost 11
corey11

rrElite Veteran

Bay Area, California

My Posts: All  Forum  Topic

I would also check the canopy. if you didnt cut it like the picture shows, it will catch it. It happened to me and i also though i had a glitch. The only way i saved it was to go full positive, and go to like -1 into a auto and land it so it would catch again.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
06-01-2004 02:47 AM  13 years agoPost 12
Raffy

rrElite Veteran

Chicago, Illinois

My Posts: All  Forum  Topic

Your type of crash happened to me last week with my X-cell Graphite after I did a continous flip and roll maneuver at about 20 feet. When the heli leveled right side up the heli went out of control and the more I tried to control the heli the more it went to mother earth.
I went to inspect the head area and found that the flybar arms were lose on the flybar. The set screws were tight but with the load applied to the flybar caused the setscrews to score the flybar arm and created a play that caused the heli to go out of control.
Went to MA tech support and they replied to replace set screws and flybar arm and to let them know it that fixed the problem.....NOT!
I grind the flybar where the set screws are located to make sure nothing like that happens again.

PM  EMAIL  GALLERY  Attn:RR  Quote
06-01-2004 05:01 AM  13 years agoPost 13
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

Don't know how much time you have on the servos in your heli, but I've had a couple of servo motors die in the air.

One of the wires from the poles to the commutators fatigued and broke. This will give your servo a dead spot. I was hovering a Schluter Champion many years ago, it simply rolled over and crashed. Post mortem showed that the roll servo had developed a dead spot.

A year or so later, I had what is now the equivalent of an Xcell Sport Trainer do three nice, tight loops, without me telling it to do so. I landed the helicopter, and as I was walking up to it to shut it down, I noticed that the fore/aft cyclic servo wasn't moving the swashplate. I gave the swashplate a push, and it began to move. This motor also had a dead spot in it.

In both cases, one of the wires inside the motor had broken, creating the dead spot.

These two servos had a lot of time in their respective helis. I replaced all the servos in both machines shortly thereafter, and went back through the helis and did what I could to reduce vibration levels.

May not be your problem, but it is one to beware of.

Dave

PM  EMAIL  GALLERY  Attn:RR  Quote
06-02-2004 12:15 AM  13 years agoPost 14
RotorHead486

rrKey Veteran

England

My Posts: All  Forum  Topic

Hey guys,

Cheers for the information.

I have been chatting to a couple of the guys at our field who witnessed the impact and we have come to the conclusion that it was most likely a servo failure as the way it happended it seems to rule out the possibility of a TX failure and with the nicad still having 90% in it and even with all the servos in operation the whole system was only pulling 4.8v from the nicad and approx 1A.

From what happened and the way i tried to regain control suggests to me that either the servo had failed or as Christian suggested it may have had something to do with the canopy!! as there was a little chip in the paintwork were the forwar link is. But i have the rubber channel stuck to the underside of the canopy which keeps the canopy from floating around and there was plenty of clearance between the pushrod and the canopy, also the side that is chipped slightly is the side which impacted the ground so i'm guessing the impact caused the link to chip the paintwork???

For me at this moment i am thinking along the lines of a servo failure but the pushrod catching on the canopy is a very real posibility.

The heli itself has only had approx 2 gallons through it as i was still breaking in the engine and when the failure occured i was in a very low hover and hovering is basically was the machine has done for most of the time apart from short half circuits.

It really starts to P me off when a cause of a crash cannot be identified.

Cheers guys! keep em rolling!!
Rotorhead486

One Reason For Crashing'Rogue Servo Bent on World Domination'!!
FLP Flight Team

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
06-02-2004 12:24 AM  13 years agoPost 15
sharam

rrElite Veteran

Northern California - Fly at Morgan Hill Field

My Posts: All  Forum  Topic

RotorHead486,

This guy seems to have had a similar experience.

Check out:

http://runryder.com/helicopter/t110147p1/

PM  EMAIL  GALLERY  Attn:RR  Quote
06-02-2004 03:01 AM  13 years agoPost 16
badbradbreece88

rrApprentice

Northwest Ohio

My Posts: All  Forum  Topic

could have been another on the same channel

PM  EMAIL  Attn:RR  Quote
WATCH
 1 page 1111 views
HelicopterMain Discussion › Fury crash - Cause questions
 Print TOPIC  Make Suggestion 

 5  Topic Subscribe

Monday, December 18 - 9:09 am - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online