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06-03-2010 11:03 PM  7 years agoPost 1
tootall

rrNovice

...

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I went out to play with the rad to day and i was 15-20 ft up and BANG down she came .i just put the metal blade grips on and metal mixers on and the pin in the metal WASHOUT arm is gone and the plastic part is still there in one piece . i took it apart and motor out and theres 6 fins missing on the fan not sure what happened first lol . broke 4 frame sides .tailout put shaft bent ,tail finbroke,tail blades ,fan mixer arm. i think they sould give you the grub screws with the metal mixers ,theres holes for them so why not? could have saved me sum pain

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06-04-2010 03:56 PM  7 years agoPost 2
James Kovach

rrKey Veteran

canton, oh - US

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What mixer arm are you referring to?

*disclaimer: These are my opinions. Agree or disagree, Your Call :)
Let'r Rip Tator Chip

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06-04-2010 04:21 PM  7 years agoPost 3
rotormonkey

rrKey Veteran

Ottawa, ON - Canada

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Yeah I don't get it either. afaik there's no retaining pin in any of the mixer arms. They just screw in...

Unless you're referring to the "A arm" on the swash's elevator axis? A little CA solved that one for me.

If it can't hover, it ain't worth flying.

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06-04-2010 05:20 PM  7 years agoPost 4
oldfart

rrProfessor

Vancouver, Canada

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.....with the metal mixers
He PM'd me and is Canadian, so I have telephoned him and he is talking about these:

http://www.centuryheli.com/products...tm?prtnm=CN2351

They are not the mixer arms, as in bell mixer, but rather the upgraded metal washout arms. And the pin he is referring to is the ones that attach the plastic A-arms to the metal control arms, In early production kits the plastic is not up to standard.
This could be why the main grips are failing?

Phil

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06-04-2010 05:29 PM  7 years agoPost 5
Zman

rrKey Veteran

Florida

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I reread what he wrote, he said the metal pin is missing not the metal arm. Got it. Dont know if there is enough meat for a grub screw but as mentioned above a tiny drop of ca or red loctite is a good way of keeping them in.

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06-04-2010 07:05 PM  7 years agoPost 6
Optech

rrKey Veteran

San Diego, CA.

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Just keep in mind these parts have to pivot somewhere. If you lock the pins to the metal arm, you'll have to free up the fit in the plastic link.

Or, if you lock them to the plastic, make sure they're free to pivot in the arm.

Mike

Viva La Airtronics!

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06-05-2010 03:45 AM  7 years agoPost 7
seflyer

rrApprentice

Northern California, Palo Cedro

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thats a real bummer, mine fell from the sky last Sunday, broken servo arm with 4 screws, same deal, all broken frames and lost the motor to.
it was built light and strong but not meant to survive a crash to well. gotta trade strength for weight. let me knwo if you need some parts as mine will not be rebuilt, cheaper to replace.

Kevin

My heli is right side up -- the world is upside down

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06-05-2010 07:44 AM  7 years agoPost 8
tootall

rrNovice

...

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SORRY to see your following suite . jr makes good servos to bad they dont make good servo wheels .if thats what took it out . its always somthing you cant see .thnz for the offer i already made an order for parts now for the wait ....

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06-05-2010 02:21 PM  7 years agoPost 9
Against Gravity

rrVeteran

Pottstown PA

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Sorry for your loss

How high Were you when you lost it. Mine has hit fairly hard twice and I was surprised how well it held up, Probably just jinxed myself.
Anyway from the looks of your pipe and engine. Looks like it hit hard on its side. almost any bird will suffer badly on a hard side impact.
Next time just crash it strait up on its skids.
Or tail first like I did, they hold up better.
Hee Hee !!!

PS. I am using the Quick UK wheels on my 8717's, They fit very well and will hold up even through a crash, but can be hard on the servo gears.

AG

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06-05-2010 03:29 PM  7 years agoPost 10
seflyer

rrApprentice

Northern California, Palo Cedro

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was around 80 feet or so, this was the left cyclic servo, as I added collective it roll very hard over on it side. it went in almost 90 degrees on its left side. I will be buying a new cylinder and truing the crank and putting it on plank or something.

Kevin

My heli is right side up -- the world is upside down

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06-05-2010 03:39 PM  7 years agoPost 11
tootall

rrNovice

...

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did you use any CA between the servo arms? just wondering cause i did and i only got two screws in them so ill have to be looking at that if it aint one thing its another

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06-05-2010 05:43 PM  7 years agoPost 12
2tall

rrVeteran

Crystal Lake, Illinois, USA

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...mine fell from the sky last Sunday, broken servo arm with 4 screws...
From the photo of the destroyed servo horn it looks like two opposing screws were mounted in holes that you had to drill and the other two fit in to factory holes. Is it possible that the horn was stressed by the two holes you made - perhaps drilled undersized? The damage seems to align with the two drilled holes.

"Pay attention...lest the ground rise up and smite thee."

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06-05-2010 08:21 PM  7 years agoPost 13
seflyer

rrApprentice

Northern California, Palo Cedro

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the screws were removed post picture and there are no fractures in the horn to be seen with a magnifying glass. if when I rebuild/replace I will be using metal servo wheels.

Kevin

My heli is right side up -- the world is upside down

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06-06-2010 01:44 AM  7 years agoPost 14
Billme

rrElite Veteran

MS

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I forgot to secure the horn screw on my right cyclic, and it dumped about a foot off the ground coming in to land at Huntsville..manoman

I normally use fingernail polish on the screw into the metal output...

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06-06-2010 05:35 AM  7 years agoPost 15
seflyer

rrApprentice

Northern California, Palo Cedro

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I did drill the extra two holes but there is no damage coming from them to the fracture in the horn. I still do not know 100% for sure that this was the root cause of the crash as the heli hit on its left side and this is the left cyclic servo, from the pic of the muffler you can see it hit very hard but suffered very little canopy damage, a little scuff right about where the servo is located, so the break could be caused from the impact. my data logger showed no fades on any of the 4 satellites and battery voltage was 6.8 after the crash.

I may never now for sure exactly what happend, the screws may have weakend that area of the horn, and if so I will not be making that mistake again. live and learn I guess. in the future I will use the metal servo wheels, which I had but the stock horns with the pitch compensators was quick and easy.

Kevin

My heli is right side up -- the world is upside down

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06-07-2010 11:33 PM  7 years agoPost 16
Betofazzo

rrVeteran

Venezuela

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Oh men bad luck, the motor and pipe are not cheap to replace....on my Radikal i put a blue or red loctite in those pins...in the other helis too...regards

Finally I have a Turbine heli.. :) Mobb Powercat !!

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06-10-2010 01:13 AM  7 years agoPost 17
rccarguy

rrVeteran

Boston MA

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I reread what he wrote, he said the metal pin is missing not the metal arm. Got it. Dont know if there is enough meat for a grub screw but as mentioned above a tiny drop of ca or red loctite is a good way of keeping them in
I had the same thing happen, mainly due to a brain fart on my part. Those metal arms are drilled and tapped for a set screw to hold the pin in place (at least the ones I got from Century were), but no grub screws were supplied with the arms. I installed them New Years eve and made a mental note to dig up a pair of grub screws and install them before flying which I promptly managed to forget to do. New Years day I was at the field and about 10 feet off the ground on the first flight of the day when it threw one of the pins and severed most of the linkages on the head resulting in full negative pitch and a quick short trip to the frozen ground.

The rebuilt head has grub screws locktited into the arms holding the pins in place...

XCell Spectra G
Radikal G20
Some obsolete nitro helis too...

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