RunRyder RC Helicopter Topic - N9 Tail Mod

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Synergy R/C Synergy N9 > N9 Tail Mod

bkervaski
Key Veteran
Location: Birmingham, AL, USA

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Hey guys, a buddy of mine, Jim Griffin, has come up with a really good tail mod that addresses the star-washer slipping issue.

He's basically using a snap-ring and precision machining a grove in the brass sleeve. It works *really* well and is a very simple mod.

It will include the machined brass sleeve, snap-ring, and several varying width shims to ensure a good fit.

No specific word on when they will be generally available and I'll post pics when I get some.

Please PM me if you're interested in obtaining the mod and I'll get a list going.

Count: 37

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Synergy N9 Modified Slider Bushing (Instructions):

Installing the modified slider bushing (Stock PN 115-318) is an easy job. The new bushing has a small groove milled near the end. A precision snap ring has been provided which fits in this groove. The new bushing and snap ring replaces the old bushing and star washer (PN 106-813). The new assembly provides a positive lock, holding the slider assembly together. Although you may be able to use a small screwdriver to install the snap ring on the new bushing, it is best to use snap ring pliers. Three shim washers are also provided in .005, 010 and .015 thickness. These are used to make up for the variation in the thickness in the bearing ring assembly (PN 115-319), so you get a tight fit. One of these shim washers may or may not be needed. If one is needed to reduce slack in the slider assembly, select the best sized shim by test fitting one at a time. The shim washer goes between the snap ring and the tail pitch plate (PN 115-321). An extra snap ring has been provided in case one is ever lost.

05-21-2009 03:24 PM

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Locktite
Veteran
Location: N.J

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PM sent..

Trex 700N LE

05-21-2009 04:51 PM

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Entityofme1
Senior Heliman
Location: Birmingham, AL.

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HMMM I seem to remember a fellow posting about this very issue with the N9's design and how it needed to be addressed....Synergy here is your chance to clean up a design that I consider quite frankly inadequate and dangerous. A significant number of pilots have had issues with the star ring coming loose and most of them ( the smarter ones) have used an alternative method for adding extra security and holding power to this part in their future rebuilds. Synergy this isn't just something that you are alone in as other manufacturers use this same design and I feel they could have opted for a better method of keeping a slider assembly together as well. The combination of influences such as oil, vibration, and aggressive flying styles all contribute to the failure of this part.

05-21-2009 06:56 PM

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bkervaski
Key Veteran
Location: Birmingham, AL, USA

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Joe - you bastard - stop polluting my thread - go start your own

Seriously, this thread isn't for bitching and moaning, it's to get a list of people interested in this mod so we can get a good count.

For the record, I have two N9's and had another previously, I've never personally had an issue with this part myself. However, I helped Joe and Jim build their's and both of them had failures of this part, it wasn't a build issue.

But based on the simplicity and ease of installation of this mod, I'll be installing it myself "just in case".

05-21-2009 08:44 PM

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wings19
Key Veteran
Location: Traverse City, MI

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Count me in for one!

Nick
If the wings are traveling faster than the fuselage, it's probably a helicopter

05-21-2009 09:51 PM

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Rymps
Veteran
Location: Indianapolis

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bkervaski

Thanks for the support and putting the word out of this mod. It sounds like a good idea. Any pics? Thanks

05-22-2009 02:58 PM

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f penfold
Key Veteran
Location: uk

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You have to keep an eye on these star fixings but if you do then you will have no trouble there is a correct way to install them and I'm guessing here but i think that most people that have had problems with them have installed them incorrectly

I know I used lock tight why did my head explode

05-22-2009 03:55 PM

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bkervaski
Key Veteran
Location: Birmingham, AL, USA

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@f penfold

That's simply not true. If you install them correctly, they can still slip, even if you tap down the teeth a bit. I've built 5 N9's and two of them had the issue and I installed the part correctly.

I think the stock star ring is simply too soft for this application.

This simple and easy to install mod is designed to eliminate the problem entirely. It addresses both safety and crash concerns.

05-22-2009 03:59 PM

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f penfold
Key Veteran
Location: uk

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Like I first said if you check them reguarly this is no problem.
But i hope this mod works I am all for making a product better when there is a need . I am assumind here that the mod uses a open ended snap ring and if that fails it could be worse than a slipage .I will be interesing to follow this tread and see what happens

I know I used lock tight why did my head explode

05-22-2009 04:12 PM

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bkervaski
Key Veteran
Location: Birmingham, AL, USA

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@f penfold

lol, it is a problem. You could check the star ring before a flight and it can still come off during the flight, I know, because I've done it, and it's happened. How is "checking" it going to help at all? It's not like it can partially come off or partially slip, once the teeth start moving, it's coming off.

Also, how is a snap-ring popping off going to be any worse?

Your opinion is just as valid as mine, but I'm not going to let you minimize the issue, it's a real issue. In my experience, the stock setup has failed almost 50% of the time.

I don't see a reason to even have to worry about it, if a cheap mod will ensure my $3500 helis don't piro into the ground, I'm all for it.

05-22-2009 04:18 PM

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f penfold
Key Veteran
Location: uk

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Minimize the issue i personally haven't had that issue sorry I was told to check them when i brought the kit off bob johnson and haven't had any trouble with them . That is all I am saying

I know I used lock tight why did my head explode

05-22-2009 04:24 PM

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bkervaski
Key Veteran
Location: Birmingham, AL, USA

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@f penfold

My two N9's haven't had the issue either. Actually, I haven't had any issues with my N9's.

05-22-2009 04:27 PM

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baddynergy
Elite Veteran
Location: valencia, ca- usa

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Not to spoil the thread, but I just chuck my bushing in the drill press and take a triangle file and cut a slight groove in it. Doesn't need to be that deep, just enough to keep the teeth from slipping.

**Unattended children will be givin a shot of espresso and a puppy**

05-22-2009 04:27 PM

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f penfold
Key Veteran
Location: uk

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great idea baddynergy now thats a mod ill do

I know I used lock tight why did my head explode

05-22-2009 04:30 PM

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steve9534
Key Veteran
Location: yakima, wa.

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N9 tail

Let me start by saying that I don't own an N9, but the problem is a known one that affected some other (nameless) helis I've owned. I'd worry that cutting a groove in the brass slider would weaken it so that it can fail. The wall thickness is pretty thin, so you don't have much material to work with. What I did was to get a round punch sized to just fit inside the brass sleeve and that increased in diameter at the handle end. After putting the star washer/retainer on, I would then place the punch in the end of the sleeve and give a gentle tap or two which served to flare the end of the sleeve and keep the star from coming off. I'm sorry, I don't know how to describe it better, but it's similar to the process of flaring a copper pipe fitting. Taking it apart would require destroying the sleeve, but at least it won't come apart unintentionally and it doesn't weaken the sleeve. Hope this helps. steve

05-22-2009 04:40 PM

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inkspot1967
rrProfessor
Location: cranston ri.

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when i had my synergy i would always just use 2 star washers there never came off. but still think this is a great mod also

Crashing hitting the ground is easy...Hitting the windsock takes skill..!
FBH Synergy N9
Rave

05-22-2009 05:54 PM

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wings19
Key Veteran
Location: Traverse City, MI

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No issues with mine either but I am assuming this would be a cheap mod and that means cheap insurance!

Nick
If the wings are traveling faster than the fuselage, it's probably a helicopter

05-22-2009 07:42 PM

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Rymps
Veteran
Location: Indianapolis

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It is an issue, people with N9s need to look at this problem. I have two of the helis and one has never had this issue and the other had it while i checked on the bench. The one that came apart was all new parts. I did what baddynergy did and never had a problem since. The trick parts is getting the grove in the right place. If you are off you will have slop, and it your to tight you will have slider with bearings that are notchy.

05-22-2009 08:04 PM

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Helico-pteron
Senior Heliman
Location: Northeast Illinois

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