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HomeAircraftHelicopterHIROBOOther › Tail Control Rod Broke
11-08-2005 10:41 PM  12 years agoPost 1
DrDan

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Potosi, Missouri

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This happened to me a few weeks ago and I wanted to let everyone know to watch out for this.

I was showing a friend how well and crisp the 601/9251 setup worked whe I lost all tail authority. I was doing fast piroettes and stops on the ground so no damage occurred. But what happened was the tail rod broke at the servo end right at the little retainer pin. And the whole insert was pulled out. I asked Jeff at MRC about this and he said that it was probablydue to the fact that the rod was set to where the pin was horizontal instead of vertical. He also said that there is a lot of stress being applied to the rod and it could break, but it doesn't happen often. If you check out the pics, you'll see where it broke. Sorry for the quality.



So, be sure to place the rod where the pin is running vertical and not horizontal. I personally am now using a carbon rod for my old X-Spec.


Dr. Dan

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11-08-2005 10:53 PM  12 years agoPost 2
mcoccia

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Central Jersey

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Dr. Dan,

I am curious to how Horizontal versus Vertical would make a difference? Did Jeff say how / why?

Is this the steel pin that is mounted perm inside the rod?

I just looked at mine and is mounted vertical

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11-08-2005 10:55 PM  12 years agoPost 3
jkelly

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Bedford, PA

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DANG, that's some serious holding power. Ripped the end right off!

I'm glad you didn't suffer damages!

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11-08-2005 11:32 PM  12 years agoPost 4
DrDan

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Potosi, Missouri

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He didn't say, but I would guess that when the rod bends, it's going to bend down along the pin or even "around" it. If it is placed vertical, the rod will flex into the pin. Atleast that is how I understand it.


Dr. Dan

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11-08-2005 11:55 PM  12 years agoPost 5
DrDan

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Potosi, Missouri

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Oops, he did say. I forgot, but I did keep his reply. He also said I could use it. Here is what he wrote:


"Hi DrDan,

This is an easy one actually. The roll pin was located on the pivoting axis. That rod like the carbon one flexes up and down as the servo moves through the extremes. Ideally the pin should be 90 degrees to that axis so the rod does not pivot/flex on that hole. If the reiforcement had not broken loose, it probably would have been fine, but since it did that allowed it to move up and down until it broke out of the rod.

I have heard of them breaking before sproatically, but no one ever showed me one until now.

Make sure you place the pin up and down at the servo end for maximum strength.

Let me know if you have any other questions or problems.

Thanks for the feedback

jeff"


Dr. Dan

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11-09-2005 09:11 PM  12 years agoPost 6
elviswl

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Fort Lauderdale, South Florida

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DR. Dan

Remember to use some shrink wrap where the carbon rods pass through the rod guides, or the carbon rod will wear and break.


-elvis

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11-10-2005 01:14 AM  12 years agoPost 7
Garry-Boy

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Moscow, Russia

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Teflon shrink is the best solution

Garry.

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11-10-2005 01:36 AM  12 years agoPost 8
davehour

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Guayama, Puerto Rico 00785

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Hi,

I'm sorry about your mishap.

I checked the rod of my Evo and for the bad it's oriented with the pin horizontal.

Take care and thanks for the information.

David

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11-10-2005 06:19 PM  12 years agoPost 9
SolarXtreme

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Arroyo Grande, CA

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This has nothing to do with the Hirobo tail rod itself. NEVER stop a full speed pirouette abruptly especially if in F3C mode of the GY-601! It has enough holding power to do serious damage to your tail rotor system.
.

I picked a hell of a day to quit drinking

Avant EFX
Freya EVO

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11-10-2005 07:07 PM  12 years agoPost 10
MRC-Hirobo

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Edison, NJ

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Amen to that and servos don't like that either. Ask me how I know.

Jeff

MRC Host

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11-10-2005 07:19 PM  12 years agoPost 11
Garry-Boy

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Moscow, Russia

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Don't do this.... don't do that...... boring

Garry.

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11-10-2005 09:45 PM  12 years agoPost 12
RyanW

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Edmond, Oklahoma

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One more thing I may add- if you are using a long servo arm, make certain the rod isn't hitting the servo mount.

-Ryan
Mikado USA, Kontronik, Opti-Power, MKS Servos

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12-12-2005 09:41 PM  12 years agoPost 13
jkelly

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Bedford, PA

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Well darn if it didn't just happen to me. Take a look where it broke.


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12-13-2005 01:27 AM  12 years agoPost 14
B.Hofferth

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walkerton in.

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tail control rod
just curious, do you see that much benefit from the tube over the conventional rod setup?

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12-13-2005 03:25 PM  12 years agoPost 15
DrDan

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Potosi, Missouri

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I would think thah there would not be as much flex in the tupe.


Dr. Dan

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12-15-2005 02:57 AM  12 years agoPost 16
RCtaz

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Leander, TX

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Well I have an EVO 90 on the way, should be here tomorrow!

When I ordered it I made sure that I ordered a carbon tail control rod for it with titainium ends.

~Texas Renegade Rotorz~

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03-02-2007 06:33 PM  11 years agoPost 17
RayJayJohnsonJr

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Midwest

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Teflon shrink is the best solution
I noticed a very small amount of wear on my carbon rod where it passes thru the guides. Where do you find teflon shrink wrap, and do I need to auger out the guides if I put the shrink wrap on the carbon rod?

Thanks!

-Mark

There, their and they're. It's really that simple.

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03-02-2007 06:48 PM  11 years agoPost 18
z11355

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New England

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it's a std part from either Hirobo or MinAir.

you probably will have to do a bit of reaming.

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03-02-2007 07:12 PM  11 years agoPost 19
flybarless

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Torrington, CT

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I had to lightly sand the guides to make it perfect.

Just remember -- if the world didn't suck, we would fall off.

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03-02-2007 07:45 PM  11 years agoPost 20
Duracizer

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NC

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This has nothing to do with the Hirobo tail rod itself. NEVER stop a full speed pirouette abruptly especially if in F3C mode of the GY-601! It has enough holding power to do serious damage to your tail rotor system.
My buddy did a full speed piroutte with my other buddy's brand new Freya - I thought it was going to explode! Luckily he had the foresight to slow it down and not just let off the stick. I was amazed that no parts decided to go their own seperate ways - rock solid!

He abrubtly landed and said he had no idea it was going to piro that fast...made him sweat a little

I've noticed the wear on the carbon rod on my X-Spec and am about to replace it, I'll give the teflon shrink a try this time around.

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HomeAircraftHelicopterHIROBOOther › Tail Control Rod Broke
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