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Old 09-18-2019, 01:13 PM   #1
Bill English
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Electronic interference with ailerons


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I have a problem with my ailerons jumping after about a third throttle. My transmitter is a Futaba T14SG, about a year and a half old, and the receiver is a Futaba R617FS and it's new. The motor is a 35cc DLE. I have separated, as best I can, the motor wiring and the receiver wiring.

The aileron servos are new, and I have replaced the wiring to them in the wing.

Any suggestions?
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Old 09-18-2019, 02:31 PM   #2
floyd
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Re: Electronic interference with ailerons

Try unplugging servo's one at a time and check the Aileron servo's again. I've seen bad throttle servo's that when unplugged every thing cleared up. Your issue is similar to gas engines that ran on 72mhz. Cheers Floyd
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Old 09-18-2019, 05:02 PM   #3
Bill English
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Re: Electronic interference with ailerons

Much appreciated, Floyd. I'll try that and get back to you.
Bill
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Old 09-19-2019, 12:13 AM   #4
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Re: Electronic interference with ailerons

Hi Bill
Are you using flat servo wire extensions or twisted wire for the aileron servos ?
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Old 09-19-2019, 01:56 AM   #5
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Re: Electronic interference with ailerons

Too simple to mention but I will, since we just had it where the plug cap was not firmly on.
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Old 09-19-2019, 07:48 AM   #6
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Re: Electronic interference with ailerons

When you state the ailerons are 'Jumping", do you mean randomly moving up and/or down, or simply vibrating?

Asking since it may be a resonance issue once the RPM builds enough.

Having said that, more inclined to a power or RF issue.

Need to know more info, ie. What power source, voltage, servo make and model, etc.

Is there a noticeable voltage drop to the servos out on the wing? Extension wire diameter and length?

Lastly, is this problem new? Is this a new build or has some time on it without this problem showing up?
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Old 09-21-2019, 07:20 AM   #7
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Re: Electronic interference with ailerons

Quote:
Originally Posted by Bill English View Post
I have a problem with my ailerons jumping after about a third throttle. My transmitter is a Futaba T14SG, about a year and a half old, and the receiver is a Futaba R617FS and it's new. The motor is a 35cc DLE. I have separated, as best I can, the motor wiring and the receiver wiring.

The aileron servos are new, and I have replaced the wiring to them in the wing.

Any suggestions?

HI, I saw the similair issue a couple of weeks ago on a flying buddy's 1/5 TF P-40 with a DLE 55 using a Futaba 2.4 radio, the futaba servoes were ok but the hitec 645 servoes on the elevator and rudder would quiver or wave with various throttle applications.

After much time spent on trouble shooting, a hose clamp on the DLE ignition cap solved the problem with the two flights made with no issues. cheers - ken
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Old 09-22-2019, 11:58 AM   #8
Bill English
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Re: Electronic interference with ailerons

Quote:
Originally Posted by stegl View Post
Hi Bill
Are you using flat servo wire extensions or twisted wire for the aileron servos ?
Twisted wire for the extensions.
Bill
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Old 09-22-2019, 12:10 PM   #9
Bill English
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Re: Electronic interference with ailerons

Quote:
Originally Posted by Cougar429 View Post
When you state the ailerons are 'Jumping", do you mean randomly moving up and/or down, or simply vibrating?

Asking since it may be a resonance issue once the RPM builds enough.

Having said that, more inclined to a power or RF issue.

Need to know more info, ie. What power source, voltage, servo make and model, etc.

Is there a noticeable voltage drop to the servos out on the wing? Extension wire diameter and length?

Lastly, is this problem new? Is this a new build or has some time on it without this problem showing up?
I meant randomly moving up and down.
Power is a DLE 35cc single, 6 volt, servos are Hitec HS-645MG.
The extensions are 30" and I believe 22 guage wire.
I rebuilt the plane over a year ago. No problem previous to rebuilding.
Thanks.
Bill
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Old 09-22-2019, 04:08 PM   #10
Bill English
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Re: Electronic interference with ailerons

I'm assuming you mean the sparkplug cap when you say "ignition cap?"
Thanks.
Bill
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