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HelicopterMain Discussion › Futaba 9C,Co-Pilot Jitters!!
05-01-2004 02:10 AM  13 years agoPost 1
vortechZ230

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U.S.A.

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Anybody know what would cause a Futaba 9C, Co-Pilot, PCM receiver, setup to Jitter eratically!!, even when using a servo buffer?, The heli is almost uncontrollable using this setup!, any way to fix this, other then taking the thing off??, Thanks!, for any info.........

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05-01-2004 02:16 AM  13 years agoPost 2
Bushy

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Tucson, AZ

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How many servo cycles did you get when you did the nose down cal?
Did you do the final cal in an open field with a bubble level and stay out of the sensors path?
Are you using 1 or 2 buffers?
Did you try turning the CP down to about 20%?

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05-01-2004 02:24 AM  13 years agoPost 3
vortechZ230

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It calibrated with 3 cycles, a bubble level was used, there is one buffer connected between the elevator servo, tried various gain settings, the heli flew very erractically!, almost to the point of uncontrollable!!, any advice?........

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05-01-2004 02:26 AM  13 years agoPost 4
Glenn in Den

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Longmont, Colorado area

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I've done this and not had any problems.

What radio are you using for the buddy box?

If it is a PCM model (the buddy box, not the 9C) did you set it to PPM or FM mode?

Did you remove the module from the buddy box? Could be RF mixing/interference (unlikely but I'm trying to cover all bases here!).

Give us more info.



Glenn.

I'm not really an R/C pilot, I stayed in a Holiday Inn Express last n

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05-01-2004 02:40 AM  13 years agoPost 5
Bushy

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Tucson, AZ

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Did you try it with the CP turned off?

I have the same setup, 9CHP 50Mhz Ham band, Rap50 V2, OS 50, GV1, RDP148, Buffer and CP. Fastened to a custom machined mount as far back on the boom as the wire would go. I hold the rap by the boom supports under the CP and hold it out to arms length and push the button. I then take it to the middle of the clear field for final cal and stand 30' behind the tail.

Cals at 10 cycles, has to be run at 20% to be flyable. At 100 % all you can do is a little foward and backward. It won't let you bank :P

Have the on/off assigned to switch B and both Dual rates to D
I think 3 cycles is at the unflyable range. 2 or 3?

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05-01-2004 03:59 AM  13 years agoPost 6
allns47

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Richmond IN.

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If you only are getting a reading of 3 then you will not be able to use the co-pil;ot that day....When I get a reading less then 4 you can watch the rotor head wobble because of the co-pilot making the servos jitter...Wait until a nice day and redo calabration to see if you can get a higher reading and the try it...In set-up mode the servos will jitter..Also if you are inside your house and turn your heli on the servos will jitter to because the sensor on the tailboom is not getting 2 different heat readings like it would outside...Also if you calabrate it at the field and then come home and mess with your heli outside your servos will jitter because the calabration would be different then it was at the field.......Shawn

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05-01-2004 08:34 AM  13 years agoPost 7
sharam

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Northern California - Fly at Morgan Hill Field

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The Co-pilot had trouble working with PCM Futaba rcvrs unless you put a delay mechanism on channel 2.

Do a search - I had posted extensively about this a couple of years ago.

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05-01-2004 07:02 PM  13 years agoPost 8
allns47

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Richmond IN.

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my friend had this problem when using 9252s, he talked to the co-pilot people and the

I have all digital servos on my raptor and the co-pilot works great.......So whoever told you it does not work on digitals is wrong.......

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05-01-2004 09:31 PM  13 years agoPost 9
Rick_H

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Boulder City, Nevada

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allns47 is right, I have all digitals also and it works great. I would try turning down the gain.

Rick

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05-01-2004 09:57 PM  13 years agoPost 10
Mosser

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Warminster in Wiltshire, UK

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I'm the person that Ade is talking about with the jittery digital servo's when using the CPD4 co-pilot,

Are you US guys using the newer FS8 co-pilot maybe?

This is the response i got from FMA when i emailed them about my problem

Dear Ian,

The CPD4 is not compatible with digital servos. The FS8 Co-Pilot is. This is one of the upgrades on the new unit.

Sincerely,

Howard G. Matos
Technical Support
301-668-4280

Raptor 50 Webra 52AAR GY601, GV-1 S9252's Co-Pilot and T9CHP

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05-01-2004 11:18 PM  13 years agoPost 11
ELOSSAM

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Es

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I saw and tested co-pilot units on several Futaba PCM 149DP receivers and seems to be each one has little differences in its inner adjustment that allows in some of them to use the servo buffer successfully and with no results in other (even using two servo buffer in line) . The ones that doenst work right with the s-buffer were finally used mixing channel 2 to a spare channel and then fitting the servo wire on the spare channel socket. That trick requires sometimes to reduce the ATV of channel 2 a little to avoid a stranger jump in the servo travel but again it doesnt occur with all the receivers.

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05-01-2004 11:35 PM  13 years agoPost 12
Glenn in Den

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Longmont, Colorado area

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I'm using the 9CHP with the 9 channel RX, no servo buffer and the relocated channel trick and 9252 digital servos all around. The only problem I'm having is the movement of the swash isn't smooth. It "rachets" or "chatters" as it moves.

It is kind of annoying but I'm to a point where I don't need the co-pilot. It is only there to give me confidence.



Glenn.

I'm not really an R/C pilot, I stayed in a Holiday Inn Express last n

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05-02-2004 12:40 AM  13 years agoPost 13
allns47

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Richmond IN.

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I am using the first model of the co-pilot not the new one and I have no problem with the servos jitters...I know what your talking about the ratchet movement of the servos..This is normal if you are in your house are not in a open enough area to use your co-pilot....But once in the air you will see your co-pilot works fine..If you use two servo buffers it will be like using no buffers..The servos will jitter when you are in set-up mode this is normal....

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05-02-2004 04:03 AM  13 years agoPost 14
Rick_H

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Boulder City, Nevada

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I have both, my all digital ship is using the CPD4 co-pilot and is working great. My ship with the FS8 Rec, CP and vertical sensor is using Jr 537's.

Rick

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05-02-2004 04:55 AM  13 years agoPost 15
Glenn in Den

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Longmont, Colorado area

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I just took my co-pilot off.

I'm going to sell it on RCU. It's not that I don't think it's great . . . it is. But if I don't get rid of it now, I might not ever!!!




Glenn.

I'm not really an R/C pilot, I stayed in a Holiday Inn Express last n

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HelicopterMain Discussion › Futaba 9C,Co-Pilot Jitters!!
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