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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Am I losing it? (9z 138DP, 149Dp question)
05-05-2005 07:17 AM  13 years agoPost 1
tabbytabb

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seattle

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So today I swapped out a 138DP for a 149DP in my Joker CX.

I had to reverse the swash CCPM percentages to get the swash travel right but here is the weird part.

I also had to reverse the rudder and reverse the gyro to get correct tail movement.

I am totally confused as to how the rudder needed to be reversed as well as the gyro. Unless my younger brother sneaks into my house to F with my 9z at night I dont remember ever messing with the gyro or rudder setting.

Is this normal to have to switch these controls just when changing to a different reciever?

Thanks


Tabb

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05-05-2005 08:28 AM  13 years agoPost 2
fitenfyr

rrProfessor

Port Orchard, Washington

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Uh...
I would go for the brother option.

You must have changed something in the TX somehow.
Sure you are on the correct model?

Jason Stiffey
Fly Fast....Live Slow...

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05-05-2005 04:08 PM  13 years agoPost 3
tabbytabb

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seattle

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I didnt change anything. This is weird.

I literally unplugged the 138, put 3 new 9252's on, plugged in the 149. and had to reverse the rudder and gyro.

yep, on the right model. I have been sitting here scratching my head all morning long.

Tabb

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05-05-2005 07:36 PM  13 years agoPost 4
I3DM

rrProfessor

Israel

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thats weird, i recall all of my Futaba Rx's acted exactly the same when switching between 127DF to 149DP and such..

www.liorzahavi.com

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05-05-2005 07:48 PM  13 years agoPost 5
pilotError

rrKey Veteran

Long Island, NY

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Servo's
It has been known to happen. I happened to me once after a re-build - same receiver. Scary, but the futaba reps told me not to worry about it.

Mike...

Good Judgement comes from Experience. Great Judgement comes from Bad Experience.

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05-06-2005 06:04 AM  13 years agoPost 6
stevenpph

rrNovice

Phoenix, AZ

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Why don't you try an experiment. Find two old servos laying around and plug each one into the receivers' rudder channel. Turn on the transmitter and the two receivers. Move the rudder stick back and forth and watch the servo directions.

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05-06-2005 07:05 AM  13 years agoPost 7
Wa11banger

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Huntsville, Al

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I dont know how many servos are this way, and Im not saying you did anything wrong, but when I upgraded from 9202's to 9252's I had to reverse everyone of them.. The difference was in the servos. I see in in your second post you stated I put on 3 new 9252's if thats not what the servos were in the first place the channel reversing needs are probably due to this.

Just my .02
Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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05-06-2005 05:09 PM  13 years agoPost 8
fitenfyr

rrProfessor

Port Orchard, Washington

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Makes sense...
I was just thinking about this some more and I bet it is a QC issue at Futaba.
If I am not mistaken (and I could never be wrong. ) all you need to do to "reverse" the direction of a servo on the board inside the RX is to swap the white and red or white and black.

Bet they just are not paying attention when they solder them in and some of the servos get swapped from time to time.

Jason Stiffey
Fly Fast....Live Slow...

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05-06-2005 08:30 PM  13 years agoPost 9
Wa11banger

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Huntsville, Al

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Dont swap the wires... Black is ground, red is positive, white is signal.. If you swap out the red and white you will fry it the signal power is very very small compared to drive voltage (red). It has less to do with QC and more to do with the motors used in the servo. Now I could be wrong but I remember a past lifetime when I swapped those wires and poof I let all the magic smoke out of a servo.. Technology surely could have evolved since then and this may no longer be the case but if you look how the power bus is wired on the receiver, and then look at the wiring plug for the battery you will see that you will be applying direct battery voltage to the signal wire on the servo..

Just my .02
Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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05-06-2005 09:12 PM  13 years agoPost 10
I3DM

rrProfessor

Israel

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DO NOT SWAP ANY WIRES !

fitenfyr,This is one of the worst tips i have ever read here.. it doesnt suit you.
this is a recipe for a sure disaster (smoking a servo in a heart beat).

www.liorzahavi.com

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05-07-2005 12:17 AM  13 years agoPost 11
Dr.Ben

rrMaster

Richmond, VA, USA

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My God.................Swapping wires like that will cook the servo instantly. The only way to reverse a servo is to reverse the power wires to the motor AND the pot. Doing that with a surface mounted pot and motor ain't gonna happen.

Ben Minor

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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Am I losing it? (9z 138DP, 149Dp question)
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