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Helicopter
e-
Blade
Other › blade 400 DEATH WOBBLE!!!!!!!!
06-04-2009 09:04 PM  8 years agoPost 41
helidevil

rrElite Veteran

Brunswick, ME

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vhs
this has nothing to do with the servo's. its not a temporar woble, its a LAND IT BEFORE IT EXPLODES wobble.

and ill check the pitch slider.......it is nothing in the tail.

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06-04-2009 11:42 PM  8 years agoPost 42
vhs

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Vancouver Island, Canada

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helidevil,
check your flybar see/saw holder, sometimes they crack at an angle and are hard to see. a few pictures of the head and the rest of the machine may help in locating this problem.
Good luck, don't give up!

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06-05-2009 01:16 AM  8 years agoPost 43
helidevil

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Brunswick, ME

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ill try to get some up tonight.

EDIT:
there are some of the head and "far away" tail pics. take a look and see what u can see.

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06-05-2009 02:18 AM  8 years agoPost 44
helidevil

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Brunswick, ME

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trying to get pics up..........

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06-05-2009 02:54 PM  8 years agoPost 45
Mitchilito

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Morehead City, NC USA

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Damping
Again, I'll say it sounds like you have a damping problem. If your dampers are shot coupled with high head speed or tight blade bolts can cause this kind of "wobble" you describe.

Install new dampers, run moderate head speed and leave your blade bolts slightly loose.

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06-05-2009 09:12 PM  8 years agoPost 46
helidevil

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Brunswick, ME

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the blades are loose enough that if i shake it on its side, they fall.

and i use feul line for dampening. not the stock ones. (theres almost no play!)

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06-05-2009 09:17 PM  8 years agoPost 47
DougsRC

rrProfessor

Mass.

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How long have you been flying and setting up heli's ?

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06-05-2009 09:22 PM  8 years agoPost 48
helidevil

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Brunswick, ME

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i cant remember exactally, but i think its around 3 or 4 years.

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06-05-2009 09:24 PM  8 years agoPost 49
DougsRC

rrProfessor

Mass.

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Since you were 10 years old ?

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06-05-2009 09:26 PM  8 years agoPost 50
helidevil

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Brunswick, ME

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lets see,

wana-be
blade cp
blade 400
upgrade blade 400 to death
trex 250

yep! just about

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06-05-2009 10:48 PM  8 years agoPost 51
Ray Fernandez

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Guam (U.S.A.)

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You say you use fuel line and there's no play? Try using the stock dampners. As far as the main blades being "loose enough that if i shake it on its side, they fall", just tighten enough so when you shake it, it does not "fall" easily.

Ray Fernandez - GUAM

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06-06-2009 04:55 PM  8 years agoPost 52
HeliFisher

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Verdi , Nevadafornia

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Have you checked/replaced ALL your bearings. I can't stress how important this can be. For instance, if one of the bearings in your tail drive gear is bad, this can cause a severe vibration.

If you've done all that, start checking your frame for hidden cracks or a stripped out screw. You may have to take it down to a bare frame. I know that can be a pain, but it's good practice.

Just remember that it's vibrating for a reason and you can track down that reason using a process of elimination and working methodically (take your time & do a good job). Stick with it, you'll figure it out.

The less a man makes a clarative statement, the less likely he is to look like a fool in retrospect.

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06-06-2009 05:29 PM  8 years agoPost 53
helidevil

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Brunswick, ME

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well it seemed to go away when i replaced the main shaft berrings, but i only got a minute in idle up before my batt died (had mesh and belt, then the next flight my battery blew up! (well cell #2 burst!)

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06-08-2009 06:56 PM  8 years agoPost 54
solar-c

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St Albans, UK

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sage advice...thanks HeliFisher
So I did what HeliFisher suggested and changed the tail drive bearings...bingo! I was reluctant to do this particular bearing change due to the amount of work involved...in the end it wasn't so bad, only about 2 hours including radio removal/ re-setup, (if you're cute with it you can semi-split the frames and leave the front end i.e. motor mounts etc in place) and the tail vibes have all but dissapeared.
helidevil, if you haven't already, give those tail drive bearings the once-over...well worth a try if all else fails.

I'm going flying - cheers

- Heli's for Life -

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06-08-2009 07:53 PM  8 years agoPost 55
helidevil

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Brunswick, ME

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i have replaqced one that literlly fell apart in my hands, but i did not replace the other one.

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06-08-2009 08:02 PM  8 years agoPost 56
solar-c

rrNovice

St Albans, UK

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I'm wondering how or why one could fall apart like that - was it the result of crash damage? if so (just guessing here...) the other one probably sustained damage, and the tail drive gear could also be tweaked. The lower bearing is easy to replace - its the upper one that requires splitting the frames...it has to be worth replacing both, for your own peace of mind

- Heli's for Life -

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06-08-2009 08:07 PM  8 years agoPost 57
helidevil

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Brunswick, ME

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are you talking about the tail berrings? or the main berrings? because the tail one is the one that exploded on me.

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06-08-2009 09:31 PM  8 years agoPost 58
solar-c

rrNovice

St Albans, UK

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the tail bearings either end of the tail drive gear, at the front of the tailboom (not the tail case ones, although those should be checked too if you've got crazy vibes) they were both shot on my heli and replacing them cured that ridiculous, severe vibration. I replaced all 3 main bearings previously, but it was the tail drive ones that were causing the problem...definitely worth replacing both

- Heli's for Life -

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06-09-2009 10:02 PM  8 years agoPost 59
helidevil

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Brunswick, ME

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PROBLEM FOUND!!!!!!!!!!!!!!!!!!!!!
I replaced the flybar and the landing gear, and the fricken wobble that cost me berrings, 6 packs of main shafts, and countless hours of anguishing over the situation! (well maybe not countless hours, but it felt like it )

i dint know where it was in these parts, but ITS FINISHED!!!!!!

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06-09-2009 11:02 PM  8 years agoPost 60
solar-c

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St Albans, UK

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Excellent! Feel the satisfaction...and relief

- Heli's for Life -

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Helicopter
e-
Blade
Other › blade 400 DEATH WOBBLE!!!!!!!!
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