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HelicopterMain Discussion › Metal servo arms
09-01-2009 04:34 AM  8 years agoPost 1
UH-60PILOT

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Seoul, South Korea

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How many of you out there stay away from metal servo arms and wheels because you think they will tear up gear sets that you always break even when you use plastic ones? So what's the difference?

Kenny Thompson

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09-01-2009 04:45 AM  8 years agoPost 2
ch-47c

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san jose, ca

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On my Trex600e I used the plastic Align wheels, JRVibe50 I used the plastic servo wheels provided, and my Synergy N9 I used Dubro HD arms made of plastic, because I couldn't find wheels or arms that fit to my liking without grinding.

Not too worried about gear teeth so much because I think the eccpm setup prevents gear damage due to load share. IMHO. All the above use JR8717. I've never replaced any gears yet. I have an EP Cypher that has eccpm, but the servos were Futaba 3154 (not sure, but super small). They stripped 2 servos every crash, so I replaced with Hitec HS65 Karbonites and haven't replaced one yet. Just my experience.

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09-01-2009 06:31 AM  8 years agoPost 3
outhouse

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auburn ca

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i break plastic servo arms and thats allot cheaper then cases or gears or anything else.

i wont use alloy arms

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09-01-2009 07:04 AM  8 years agoPost 4
Mapleleafs

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Ontario, Canada

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+1 exactly what outhouse said.

The aluminum arms have no give and all the force is applied directly to the servo in a crash, usually resulting in broken servo tabs, cracked case, and stripped gears.

In my experience in a hard enough crash the plastic arms will break or strip saving your servo alot of damage.

Bling isnt always good everywhere.
***maybe we should be using metal ball links then?***

Vbar Trex 700N, Vbar MSH Protos 500, Vbar Logo 400

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09-01-2009 11:30 AM  8 years agoPost 5
MartyH

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USA

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I use the plastic arms because they are strong and stiff enough for the heli application and hopefully provide some protection for the servos in a crash.

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09-01-2009 12:40 PM  8 years agoPost 6
Dblex

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Texas

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I hate em!

I had "had" a H9 Sukhoi, Red Bull'd out, with a DA-85

Vibration monster!

Well, during my build I figured a metal arm on the throttle wont hurt. Coming from heli's I know that loctite is my best friend!

Well..... I was hovering my Sukhoi with a buddy of mine right next to me when the engine quit. I had enough to bring it around but left the plane in 3D mode and stalled it turning into the wind..LOL

Culprit? throttle arm vibrated out.

Just sharing my pain...not complaining....LMAO

Highly Medicated for your protection......

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09-01-2009 02:19 PM  8 years agoPost 7
tr0cksrrApprentice - NJ, 08344 - My Posts: All  Forum  Topic

quick uk wheels for me, i've had serval put ins some bad some not so bad, havent even stripped a gear, love these tings.

I remember when sex was safe and Heli's where dangerous.

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09-01-2009 02:58 PM  8 years agoPost 8
JRjoe

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Jonesville , IN USA #1

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Yo Dblex

It's that dang DA85 that caused that. IMO it's a piece of dodo.

Stuff happens though...

Yep, plastic arms here too....


JRjoe.....
Indoor plumbing??? No, we don't need that!!!

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09-01-2009 06:37 PM  8 years agoPost 9
Dblex

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Texas

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Oh yeah! I know that! LMAO!!

SOLD IT TOO! LMAO

Highly Medicated for your protection......

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09-01-2009 06:54 PM  8 years agoPost 10
jackheli

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Vancouver - Canada

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Not too worried about gear teeth so much because I think the eccpm setup prevents gear damage due to load share.
Man, is that so? so how come we continue to strip gears on a fully supported eccpm swash?

From my experience it is quite the contrary, actually. Because of direct support the swash is super tightly bonded to the servo with no giving. It is cool for 3D but terrible on a crash.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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09-01-2009 07:54 PM  8 years agoPost 11
Chickenrun

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Lincolnshire England UK

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There also may be risk of bolt shear, even with the cap head type I think plastic disc's / arm's wins this one

Cheers

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09-01-2009 11:00 PM  8 years agoPost 12
davidjc

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E-Town , Kentucky

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Plastic! Way cheaper than $35. gear set. You just have to check the splines when in doubt, I didn't last time and it cost me $120 so I have learned my lesson.

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09-01-2009 11:15 PM  8 years agoPost 13
ch-47c

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san jose, ca

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Quote 
Not too worried about gear teeth so much because I think the eccpm setup prevents gear damage due to load share.
Man, is that so? so how come we continue to strip gears on a fully supported eccpm swash?

From my experience it is quite the contrary, actually. Because of direct support the swash is super tightly bonded to the servo with no giving. It is cool for 3D but terrible on a crash.
Good for you. I just wrote my experience. Next time I'll make something up. Didn't intend to get anybodies panties in a bunch.

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09-02-2009 01:55 AM  8 years agoPost 14
UH-60PILOT

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Seoul, South Korea

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Great responses! Thanks guys. So do you all think plastic gives better because of the splines or the give of the arms or both?

Kenny Thompson

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09-02-2009 02:19 AM  8 years agoPost 15
Sillyness

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Little Rock AR

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Load share doesn't really exist. It's a myth.

The reason?

mCCPM: one servo is responsible for each axis. It's full travel goes toward that axis. Lets say +/- 60 degrees for each axis. As a consequence, each servo gets more leverage on each axis, as well as increased resolution (full 60 degrees devoted to JUST aileron, for example).

eCCPM: all 3 servos must perform collective, aileron, and elevator functions. Each servo can only devote a portion of its travel to each axis. For example, 20 degrees to collective, 20 degrees to aileron, and 20 degrees to elevator. The result... 1/3 of the travel for each axis times 3 servos equals the same load on each servo as in mCCPM (leverage is decreased, as is power, to get the swash movement required for each axis to work). Also, 1/3 the resolution.

Why does eCCPM feel snappier? Simple... each servo only has to move 1/3 the distance it would in an mCCPM machine to accomplish a given task. Say collective... a single servo moves 60 degrees in an mCCPM machine where the three servos in an eCCPM machine only have to move 20 degrees each. It effectively makes the servos feel 3 times faster, at the expense of resolution. The power to the swash remains aproximately the same.

Damage: an mCCPM machine should experience less damage to the aileron and elevator servos and possibly more to the colletive servo (at least the way the ol' Raptor is rigged).

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09-02-2009 06:11 AM  8 years agoPost 16
Anthony.L

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Seattle, WA

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I do not run metal servo arms. I'm a firm believe in the event of a crash I much rather replace plastic servo wheels then servo gears. Now with that said I've stripped servo gears with plastic wheels, however not in every single crash. With metal arms it's almost guaranteed the servo gears will strip in a crash.

The bottom line is somewhere along the chain of parts something has the break when force is applied. I would rather be able to pick and choose where that break point is, and not to mention the least expensive section.

Servo wheels = $8, Servo gears = $45 per servo. Your choice.

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09-02-2009 06:23 AM  8 years agoPost 17
Sonic88

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Murfreesboro, TN

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I agree. Although, I am a very conservative pilot which keeps my crashes rare (but drastically slows progression), I agree that an $8 dollar part is preferable over a set of gears. I will say those QuickUK anodized alu. wheels look pretty cool. After flying a little over a year, though, I have finally passed the looks phase in favor of functionality.

Procrastinators of the world unite ... tomorrow.
AMA #: 912822

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09-02-2009 08:10 AM  8 years agoPost 18
Mapleleafs

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Ontario, Canada

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More like 3 sets of gears at $30=$90

or 1 pack(3 servo wheels) for $6.00

is it really worth the extra $84 of bling that 95% the time is hidden by the canopy....

Vbar Trex 700N, Vbar MSH Protos 500, Vbar Logo 400

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09-02-2009 05:36 PM  8 years agoPost 19
Swoop

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Newark, DE USA

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I broke a futaba 6 spoke plastic wheel on a hard auto when the tail hit. I'm still flying that 9254 with no problems, so for me, plastic wins.

Chris
X50, B320, Radix, Spartan
Titan,Kasama,MP5,Radix,JR770
Trex450SE,MavrikkG5,Phoenix35

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09-02-2009 08:04 PM  8 years agoPost 20
TachyonDriver

rrKey Veteran

Chipping, Lancs, UK

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The only metal servo arm is the one on the steering servo for my AX10 Scorpion rock crawler.

Tach.

Little Spinning Bundle of Joy® DON'T DISS THE DINO!!

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HelicopterMain Discussion › Metal servo arms
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