RunRyder RC
 4  Topic Subscribe
WATCH
 1 page 1211 views POST REPLY
HomeAircraftHelicopterFlybarless Rotor Head SystemsFutaba CGY › fbl conversion
08-12-2012 07:51 PM  5 years agoPost 1
coolingfan

rrVeteran

Grand Junction, Colorado

My Posts: All  Forum  Topic

I jest recently converted my Raptor 50 pro to fbl. I am using the Futaba cgy 750 controller. I have the raptor fbl head on also. I am using Futaba S 9252 servos on pitch, elevator, and aileron. and Futaba S9254 on rudder. And S3154 on throttle. The problem I am having is the Heli shakes violently when lifting in to a hover. I have tried different mounting pads. Everything from the original 2 sided tape that comes with the cgy 750, gray tape from 3 M and some foam tape that I have used on a GY 520 . The foam tape seem better. If I kept the head speed below 1600 rpm it is find. Before when it was flybar it flew fine, no shaking. It has just started this since converting it to fbl. Any suggestions?

Is anyone using the cgy750 on a Older Raptor?

PM  EMAIL  GALLERY  Attn:RR  Quote
08-12-2012 09:31 PM  5 years agoPost 2
WessCo

rrApprentice

Summerville, GA USA

My Posts: All  Forum  Topic

Do you know what your gains are set at?

PM  EMAIL  GALLERY  Attn:RR  Quote
08-12-2012 10:12 PM  5 years agoPost 3
kcordell

rrElite Veteran

O Fallon, MO

My Posts: All  Forum  Topic

Could also be the head isn't balanced well.
And, although those are very good servos, they aren't the best choice for FBL due to the high resolution and demands of the CGY-750.

Team Futaba, Team Synergy/Rail, Team Scorpion, Team Castle Creations, YS Engines, VelTye

PM  EMAIL  GALLERY  Attn:RR  Quote
08-12-2012 10:41 PM  5 years agoPost 4
coolingfan

rrVeteran

Grand Junction, Colorado

My Posts: All  Forum  Topic

my gains are set at 65 on aileron and elevator and 50 on rudder. I have a Titan X50 and am running the same setup, but am using Align 620 on cyclic and 9254 on rudder and it is rock solid.

PM  EMAIL  GALLERY  Attn:RR  Quote
08-13-2012 12:24 AM  5 years agoPost 5
slickporsche

rrVeteran

American/Philippines

My Posts: All  Forum  Topic

Futaba CGY Fbl conversion
Try it with no gyro on Aileron and elevator. My guess is the shakes will go away. The CGY could also be trying to compensate for blades with the wrong chordwise center of gravity. FBL likes to have heavier blades, and a C.G. of about 25-28%. If you take the gyro out of the loop so to speak and only use it for the tail, you would know quickly whats up.

I learned a lot back in the day, with my Legend FBL and only tail gyro. I Flew the crap out of that one, and it was very aerobatic. I think that one would still fly even better with modern carbon blades, and computor radio.

PM  EMAIL  GALLERY  Attn:RR  Quote
08-13-2012 01:48 AM  5 years agoPost 6
marc8090

rrElite Veteran

Long Island, N.Y.

My Posts: All  Forum  Topic

Have you read Dr Ben's posts and lowered the D gain? I had a little aileron shake and lowering the D gain fixed it completely. Default is 200, lower it to 50 and give it a try.

PM  EMAIL  Attn:RR  Quote
08-13-2012 03:21 AM  5 years agoPost 7
coolingfan

rrVeteran

Grand Junction, Colorado

My Posts: All  Forum  Topic

Thanks guys for all the good input. Heres where I am with it. I lower the gain on the AVCS to 40 shakes on gone. So I move the balls on the aileron and elevator to 1 hole in. This gives about 8.5mm to center. test flew help slightly. But still couldn't get the gain above 45. A heli buddy suggest changing the head response from 1 to 3 on ele and ail. Big difference. Was able to raise the gain to 65 now. Any higher gain and it will start to shake. Head speed at 1900rpm. The mosquitos were beginning to eat me alive, so I decided to quite for the evening. I will resume testing next weekend. As I don't get home till after the varmints are out again!

PM  EMAIL  GALLERY  Attn:RR  Quote
08-13-2012 03:28 AM  5 years agoPost 8
WessCo

rrApprentice

Summerville, GA USA

My Posts: All  Forum  Topic

What frequency are your servos set at? There's lots of variables and we'll all be guessing at what the problem is, without some setup info.

PM  EMAIL  GALLERY  Attn:RR  Quote
08-13-2012 09:30 AM  5 years agoPost 9
Knud Pedersen

rrKey Veteran

Denmark - Europe

My Posts: All  Forum  Topic

As Marc8090 mentioned, have your read Dr. Bens Consolidated V1.2 tips?
https://rc.runryder.com/t672354p1/

Here is want i have done to remove the skidswobble problem.
https://rc.runryder.com/t706085p1/?p=5823916#RR

ChopperKnud
Team Miniature Aircraft
ThePitchbrothers

PM  EMAIL  GALLERY  Attn:RR  Quote
08-13-2012 10:55 AM  5 years agoPost 10
kcordell

rrElite Veteran

O Fallon, MO

My Posts: All  Forum  Topic

Also, if your tail is setup good, no reason you shouldn't be able to runs gains in the70+ range with that controller. It should be a seamless transition, was for me on 2 different models.

Team Futaba, Team Synergy/Rail, Team Scorpion, Team Castle Creations, YS Engines, VelTye

PM  EMAIL  GALLERY  Attn:RR  Quote
08-13-2012 06:45 PM  5 years agoPost 11
coolingfan

rrVeteran

Grand Junction, Colorado

My Posts: All  Forum  Topic

Those are all good questions guys. This is not the first time I have used this controller. I have it presently installed on my Titan x50 with no issues. I have also used one on my Trex 500 with no issues. And Yes I have read DR Ben's info. So far I think it is coming down to the servos not being able to handle the cgy 750. but difinately changing the head response on both aileron and elevator is heading in the right direction. Frequency is set correctly. I used the beast x servo chart to abtain them. I am sure there are better servos then Futaba S9252 that I am using presently. Not going to be any testing today. It is presently overcast and raining.

PM  EMAIL  GALLERY  Attn:RR  Quote
08-14-2012 03:53 AM  5 years agoPost 12
Dr.Ben

rrMaster

Richmond, VA, USA

My Posts: All  Forum  Topic

Since this is an mCCPM model, swash AFR's are not in play. Be that as it may, how much cyclic travel do you have at 100%AFR / D/R?

The servos are well within the capability of the 750 and vice versa.

Go ahead and take head response on AIL up to 4.

Frequency for ALL Futaba digital, non 760 uS servos should be set to 285Hz.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

PM  EMAIL  GALLERY  Attn:RR  Quote
08-14-2012 04:18 AM  5 years agoPost 13
coolingfan

rrVeteran

Grand Junction, Colorado

My Posts: All  Forum  Topic

I have 8 degrees on elevator and aileron cyclic. And -12 +12 on collective. And that is exactly what I have done, is increase the head response to 4. And frequency is set at 285Hz. But have not had time to fly it. Raining!!! Maybe this weekend. Thanks DR.Ben

PM  EMAIL  GALLERY  Attn:RR  Quote
08-14-2012 04:56 AM  5 years agoPost 14
Dr.Ben

rrMaster

Richmond, VA, USA

My Posts: All  Forum  Topic

Keep the ELE at 2 or 3 for now.

Also, you need to measure the cyclic pitch with the gyros in rate mode and the gains at 0. Cyclic pitch measurement is not accurate for mCCPM models unless you do this.

Let me know how it works next time.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

PM  EMAIL  GALLERY  Attn:RR  Quote
08-15-2012 03:56 AM  5 years agoPost 15
coolingfan

rrVeteran

Grand Junction, Colorado

My Posts: All  Forum  Topic

Thanks, I have made on the changes. I just need to get home from work while there is sufficient daylight! May have to wait until Saturday! Thanks again

PM  EMAIL  GALLERY  Attn:RR  Quote
08-16-2012 05:44 AM  5 years agoPost 16
coolingfan

rrVeteran

Grand Junction, Colorado

My Posts: All  Forum  Topic

Alright got home in time to due a test flight. All I have to say is awesome! Thanks Dr.Ben. Raise the gain to 70 and it is rock solid. This weekend I will take it to the flying field and test it further. But from what i can tell at this point is it is awesome!!! Thanks again.

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 1211 views POST REPLY
HomeAircraftHelicopterFlybarless Rotor Head SystemsFutaba CGY › fbl conversion
 Print TOPIC  Make Suggestion 

 4  Topic Subscribe

Sunday, June 24 - 12:20 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online