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Synergy R/C Synergy N9 > Solid G setup
 
 
GScott
Key Veteran
Location: Lewis Center, OH

I need some help with my Solid G setup. I'm running the Solid G w/ a 8900 servo at the recommended 40% gain (set via G-view). I still have a nasty wag in hover. I've set the model as Synergy and left everything at the defaults otherwise. The engine may be a little rich (YS SR w/ SB19) but not enough that it should cause the wag. I'm curious what distance others are running the tail servo ball link at. Any other settings I should change?
05-11-2008 05:21 PM
 
 
Long Nguyen K.
Senior Heliman
Location: La Crescenta, CA - U.S.A.

I got a wonderful result with the Solid G. I use the most outer hole on the 8900's servo wheel. For the gain setting, i use end point menu to adjust the gain instead of the g-view menu.

Synergy N9 - YS 91SR - Hatori SB-19FH
05-11-2008 06:13 PM
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Marshall Burrou
Senior Heliman
Location: Maumelle, Arkansas

Make sure you have the tail linkage silky smooth. This may possibly have something to do with the slow wag. If you don't have the Hypersizer, use a pair of small pliers and slightly squeeze the links to free them up. That goes for the pitch slider links as well. Those are the most likely to be stiff. Also, make sure you used the 2 foam dbl sided sticky tape on the gyro that came with it as well. The 40% gain is a starting point. You may have to adjust the gain upwards each time you fly until it starts wagging faster then backing off a tad. For me, this Gyro seems to perform better and better as the gain goes higher. The piro rate is really consistent and holds like a rock.


CurtisYoungblood.com
05-11-2008 07:32 PM
 
 
Futura SE
Senior Heliman
Location: Fayetteville, Arkansas

I disagree with Marshall just a little bit. He is right on about making the tail smooth, but I started with 38% or 39% gain on my Solid G with setup on the bench and i have NEVER touched the gain even once. In over 12 years flying helis I have never been able to set the gain and forget it. I have not touched it as the tail is consistent in any and all moves. I have tried my hardest to bog he head and make the tail stumble and it will not. I have bogged the head in fast backwards flight and any tail will kick out and the Solid G has never let go on me. I have not turned up my gain as there is no way to improve what the tail is already doing. Turning up the gain on this gyro is not needed. Properly setup and with a proper setup machine it simply has no equal in my opinion. I also have a new Spartan DS760 that is supposed to be the end all be all gyro and it is not one ounce any better. In fact I do not like the feel as well. Curtis's setting for the Synergy in a Solid G is the best there is period. Properly set this gyro does not need a lot of gain to do its job and do it well.

I have:

Solid G Gyro
JR 8900G Servo regulated to 5.4v
Stock SAB tails
I did size the tail pitch links with a HyperSizer (in fact the whole machine)
Gain 38% in normal mode (1730 on the head) and 36% in Idle up 2. 1920 Headspeed via a ATGv2 in Idle Up 2.

The only setting I had to change was the Piro Balance.
Mine would piro normal speed to the left and it would peg the slider to the right I mean it was violent fast. Curtis told me the numbers are pretty fine so adjust it several numbers at one time. Stock was set to like 54. I ended up at 38 and it is perfect both ways. Never had a wag ever. I could have solved the problem and did fly it like this for several flights by making the Rudder ATV's 100 to the left and 75 to the right.

Norman Ross Jr.
05-12-2008 01:55 AM
 
 
Marshall Burrou
Senior Heliman
Location: Maumelle, Arkansas

Not sure this makes any difference but I'm running the Futaba 9256. I really don't think it makes any difference which servo, I could be wrong. My gain on a Spektrum DX-7 is 57% for the Synergy. Mine holds and tracks better with this gain setting than with the initial 40 setting. No question. I have 4 machines with the Solid-G and each one is a tad different but none are set on 40. That is a suggested initial gain setting you set in your radio when doing the initial gyro setup and can be adjusted lower or higher as needed.

One thing to note: The stock SAB tail blades are massive compared to 105 Radix which I'm running. You probably can't run the gain any higher with those. A lot of factors affect gyro gain.


CurtisYoungblood.com
05-12-2008 03:06 AM
 
 
GScott
Key Veteran
Location: Lewis Center, OH

Thanks for the info. I've sized the links and the tail is about as smooth as it can get but it still wags. I've tried increasing and decreasing the gain but I cannot get rid of the wag. The gyro was used so I didn't get any of the stock gyro tape and have tried the thicker CSM tape and even 2 layers of the 3M gray tape but the wag is still there. It seems to hold fine in forward flight.

Futura,

How far out is the linkage ball on your 8900? That's the only other thing I can think of to try.
05-12-2008 04:14 AM
 
 
Marshall Burrou
Senior Heliman
Location: Maumelle, Arkansas

Some other things to check.

Is the gyro sensor close to any other electronics?

Is the gyro tape too loose?

Is something possibly touching or vibrating around it?

Make sure the front radio tray where it attaches to the frame is absolutely tight and doesn't move.

My Futaba arm has the ball out around 17mm. It may need to be different for the 8900 but should be similar.

Worse case, the sensor may have an issue since it is not new.

I have however had a similar thing happen on one heli where the engine was too rich and the tail did wag in hover but not during flight.

I am running default settings for the Synergy with a 57% gain.

Hope this helps!


CurtisYoungblood.com
05-12-2008 04:27 AM
 
 
Futura SE
Senior Heliman
Location: Fayetteville, Arkansas

I am 17mm off center. Like Marshall says the size of the disk has a large performance on the amount of gain. Mine holds perfect with less than 40% gain with the stock SAB tails. Every tail blade will take a different amount of gain to get it to work well.

Norman Ross Jr.
05-12-2008 05:47 AM
 
 
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Synergy R/C Synergy N9 > Solid G setup
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