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HomeAircraftHelicopterSynergy R/COther › 2 teeth chewed up on crown gear!
04-02-2009 02:59 AM  9 years agoPost 1
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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What the heck!

I have two teeth chewed up on the crown gear after todays 2 flights! Yes I did a forced auto, but it was a fine landing and I did not touch the tail blades. I know this because I checked the tail blades right before posting this!

So how the hell do I have two teeth - on opposite sides of the crown gear - chewed up? Are these things made out of butter?

What the heck!!!

For $45 these things should be made out of CNC delrin, but they look like a fairly soft material. I just don't get it???

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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04-02-2009 04:26 AM  9 years agoPost 2
baddynergy

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sierra madre, ca- usa

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Did you set up the tail gear mesh acorrding to Chuckies tips?

Even when I went in tail first and my boom split around the mainshaft, my crown gear was fine. But if you need a crown I have 2 spares..

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

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04-02-2009 04:38 AM  9 years agoPost 3
ch-47c

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san jose, ca

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Gear mesh. Make sure the main is right too. I cobbed the power on climb out once and it ripped all the teeth on it and I had to auto between an earthen dike and a fence behind a tree.

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04-02-2009 06:41 AM  9 years agoPost 4
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Did you set up the tail gear mesh acorrding to Chuckies tips?
Yup - Reread my hardcopy of his build tips before doing the gear mesh on the last rebuild.

I have one shim under the crown gear. The kit came with 2 shims, I measured them, and used the thickest of the two.

How is yours set up?

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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04-02-2009 11:22 AM  9 years agoPost 5
ch-47c

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san jose, ca

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I used the thin one on mine with no problems with the crown mesh.

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04-02-2009 03:48 PM  9 years agoPost 6
DEFILER

rrApprentice

Houston - USA, Balad - IRAQ, Kuwait - KWI

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Did you look at it funny cause mine strips when I do....

All of mine have stripped with minor tail touching. The crown IS delrin I'm fairly positive but you are running a steel bevel input gear which accounts for the easy strippage.

The crown gear is a sacrificial part however it sucks that it's a $40 sacrificial part.

I use tri-flow plastic safe grease on mine and it seems to hold up well even with aggressive pyro rates and hard stops. It's just the ground strikes that are the killers. Perhaps you touched ever so lightly on an auto and didn't notice.

I used the thick shim first and it was too tight. Thin works good.

I only crash due to random planetary intervention

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04-02-2009 07:00 PM  9 years agoPost 7
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Did you look at it funny cause mine strips when I do....
Yes, I think I looked at it funny. I know I looked at it funny last night when I first saw the damage!!!

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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04-02-2009 08:05 PM  9 years agoPost 8
baddynergy

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sierra madre, ca- usa

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Dude, its because of the Align engine...

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

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04-03-2009 12:13 AM  9 years agoPost 9
TankDirt

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Illinois

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I dont know much about delrin but could you maybe boil the crown gear? To soften it up so it has a little give?

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04-03-2009 12:16 AM  9 years agoPost 10
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Personally it looks like it is a bit too soft right now.

It's kinda chewed up. If it was brittle, the teeth would have just snapped off, but they look more chewed up like you would expect if the material were soft.

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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04-03-2009 01:41 AM  9 years agoPost 11
Helico-pteron

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Glenview, Illinois

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Bad week huh?

I put a few drops of fuel on my crown gear before flight. One shim under the seat.

I could shout user error again, but you got pretty heated the last time I did that.

What gyro? I know the 611 is pretty hard on it.

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04-03-2009 01:55 AM  9 years agoPost 12
Fastsrt

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Lebanon, Tn

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I used the thin one on mine with no problems with the crown mesh
I second this post. Mine hasn't had a problem either with the 1 thin on it.

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04-03-2009 06:10 PM  9 years agoPost 13
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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I could shout user error again
Based on what evidence?

This is a pm from Chuckie:
Run the new crown gear a little snug and let it wear in over several flights.

Even with one shim I might move the boom forward a little to keep the mesh tight. While holding the head I'll put my little finger on the bevel gear and move it back and forth to check the end play. I'll rotate the head 90 and check the bevel gear play. I set the position of the boom so there is no end play
I set up my Synergy N9 exactly like that and I followed his build instructions to the "T" (as I mentioned earlier in this thread). So where do you get off saying that it is user error?

I think we have a troll amongst us.

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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04-03-2009 07:49 PM  9 years agoPost 14
Helico-pteron

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Glenview, Illinois

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I set mine up the same way, haven't had an issue.

Did you read where I asked about what gyro you had?

Keeping a narrow view of everything has not worked well for you recently. Open your mind to other opinions.

Chuckie has some great tips, but there are others that do too.

If you check your mesh before every flight this may be good for you in the long run.

Better yet, just a preflight check period.

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04-03-2009 10:01 PM  9 years agoPost 15
baddynergy

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sierra madre, ca- usa

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What gyro? I know the 611 is pretty hard on it.
Really??? How so??

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

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04-03-2009 10:35 PM  9 years agoPost 16
Scooterpilot

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Southern, California

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Doug

It's the mesh. You need to ensure the boom is pushed all the way forward or that's exactly what will happen.

Regards

Two G-4's & X50's YS60SR,Futaba 18SZ/12Z/14FG, ,Rail Blades Rep

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04-04-2009 12:42 AM  9 years agoPost 17
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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It's the mesh. You need to ensure the boom is pushed all the way forward or that's exactly what will happen.
Hey Chuck! Yes it was. And just like Chuckie said, it was pushed forward ever so slightly to keep the mesh tight. There was no backlash. I had two shims that came in the kit which were close in thickness, so I measured them and used the slightly thicker shim under the crown gear.

I even preloaded the boom by holding the tail end (with Mandy's help) to keep the mesh tight and then tightened the boom clamps and the boom supports.

At this point I think it was just the very fast Solid-G gyro and it's fast rates. I had a high speed, high gain tail wag on one of those 2 flights which put a lot of load on the tail system. I'm betting that's what overloaded the crown gear. The gain was right on the edge as I did not see it in a hover, but it showed itself in a hard turn when I kicked in some extra rudder.

I lowered the gain of course for the rest of the flight. But I'm betting the damage was done.

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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04-04-2009 07:33 AM  9 years agoPost 18
ch-47c

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san jose, ca

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Well Rockohaulic after everyone has back-bit you, did you get it flying again? I suppose you already have some delay in your gyro?

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04-04-2009 01:47 PM  9 years agoPost 19
Scooterpilot

rrKey Veteran

Southern, California

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Doug,

Like CH47 said, make sure you have delay in your gyro set up. When I had Todd help me set up my N9, he made sure that I had the delay set up in the gyro.

Two G-4's & X50's YS60SR,Futaba 18SZ/12Z/14FG, ,Rail Blades Rep

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04-04-2009 11:43 PM  9 years agoPost 20
missle

rrApprentice

West Chester, Oh

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Delay? I thought the "better" gyro's didn't delay if you're using a good digi servo. Is this something inherent to the N9? I'm running a 502 gyro with a 9253 servo and I've had a small bounce after fast pyro's so I had to back the gain back a couple (think it's 75 - 25 in my DX7) but the tail is now a hair slow on hard pitch changes. I was actually going to review my 502 manual to see what setting would eliminate the bounce and allow me to increase the gain back up so should I add a lil delay?

WATCH OUT!!!!!!!!

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HomeAircraftHelicopterSynergy R/COther › 2 teeth chewed up on crown gear!
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