RC Radios, Transmitters, Receivers, Servos, gyros Discussion all about rc radios, transmitters, receivers, servos, etc.

Driving me Nuts !!!!!

Reply

Old 06-30-2004, 08:54 PM
  #1  
mustangman177
Thread Starter
 
Join Date: Aug 2002
Location: Cisne, IL
Posts: 747
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Driving me Nuts !!!!!

Please Help !!

I've got a radio problem that I can not figure out. Can some one PLEASE help !!!

The radio in question is a Futaba 7 UAF.

The problem is that I'm building a new plane and am putting 4 servos (futaba 148's) in the wing. (2 on each aileron). Heres what happens.

2 servos in the left wing are connected via a Y-harness (We'll call harness A).

2 servos in the right wing are connected via a Y-harness (We'll call harness B).

Then harness A and harness B are connected via a Y-harness (We'll call harness C).

When all is connected A + B by C and plugged into the receiver, their may or may not be any movement in the ailerons.[>:]

If I plug harness A into the receiver, the two servos connected work perfectly.
If I plug harness B into the receiver, the two servos connected work perfectly.

So that tells me that the Y-harnesses connecting the servos are working perfectly, as well as the servos themselves.

I have tried different Y-harnesses to connect A and B to the receiver, but get the same eratic results. May or may not work and if works is slow and sloppy.

I'm ready to pull my hair out and scream. Can someone suggest a solution ???

Thanks for the help

Cary
mustangman177 is offline  
Reply With Quote
Old 07-01-2004, 07:34 AM
  #2  
rc-sport
My Feedback: (12)
 
rc-sport's Avatar
 
Join Date: Apr 2002
Location: Round Lake, IL
Posts: 3,180
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Driving me Nuts !!!!!

Don't use harness C, use channels 1 for the right wing and 6 or 7 for the left wing.
rc-sport is offline  
Reply With Quote
Old 07-01-2004, 11:25 AM
  #3  
Cub Man
My Feedback: (50)
 
Cub Man's Avatar
 
Join Date: Jan 2003
Location: LEXINGTON, KY
Posts: 908
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Driving me Nuts !!!!!

I would also split them out. Sounds like two much load on. After all you are sending the power and signal to four servos.
Cub Man is offline  
Reply With Quote
Old 07-01-2004, 11:44 AM
  #4  
JoeAirPort
My Feedback: (41)
 
JoeAirPort's Avatar
 
Join Date: Aug 2003
Location: Milwaukee, WI
Posts: 10,259
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Driving me Nuts !!!!!

You need matchboxes.
JoeAirPort is offline  
Reply With Quote
Old 07-01-2004, 02:08 PM
  #5  
mustangman177
Thread Starter
 
Join Date: Aug 2002
Location: Cisne, IL
Posts: 747
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Driving me Nuts !!!!!

Thanks Guys.

That's exactly what I done. Used the differential setting on the Futaba and used channels 1 and 7, with 2-6" aileron extensions to attach each wing half by.

Could also use 1 and 6 if I wanted flaperons.

Thanks again for the suggestions !!!

Cary
mustangman177 is offline  
Reply With Quote
Old 07-01-2004, 04:30 PM
  #6  
Bax
My Feedback: (11)
 
Join Date: Apr 2002
Location: Monticello, IL
Posts: 19,482
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Driving me Nuts !!!!!

Cub Man had it right. Four servos operating off of one output just put too much load on the signal lead. As a result, there was a loss in signal strength and none of the servos could get enough of a control signal to be able to respond. Four servos combined with a bunch of extra conectors and long wires all contributed to the signal loss.

Two servos usually is OK, unless you have very long leads. Then you'll need to use the Futaba MSA-10 Servo Syncrhonizer. That will allow you to run up to four servos on a single channel and adjust the travel, centering, and direction of each of the servos connected to the MSA-10.
Bax is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service