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Old Oct 22, 2011, 06:41 PM
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Hitec 2.4 Module, Eclipse 7, Optima 6 Question

Used in electric-powered scale Stinson Reliant with flaps on Channel 6, "land mode" enabled, coupled aileron and rudder, ailerons on Y cable.
Scorpion 3014-1040 outrunner and Scorpion 55 amp speed control with Park BEC.

Question: When I move aileron stick to extremes, electric motor will partially throttle up and run at low rpm(sometimes). I can prevent this glitch by setting throttle trim fully down on Eclipse 7 as far as it will go. Other than that all controls and throttle response is normal and range check is OK.

What would cause interaction between aileron command and speed control's throttle function?
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Old Oct 22, 2011, 09:21 PM
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Originally Posted by E-Challenged View Post
Used in electric-powered scale Stinson Reliant with flaps on Channel 6, "land mode" enabled, coupled aileron and rudder, ailerons on Y cable. Scorpion 3014-1040 outrunner and Scorpion 55 amp speed control with Park BEC. Question: When I move aileron stick to extremes, electric motor will partially throttle up and run at low rpm(sometimes). I can prevent this glitch by setting throttle trim fully down on Eclipse 7 as far as it will go. Other than that all controls and throttle response is normal and range check is OK. What would cause interaction between aileron command and speed control's throttle function?
1. To arm and operate correctly, all ESC require the EPA on computerised TX to be extended somewhat or throttle trim to be reduced to minimum.
2. ESC operate within many different parameters, few brands recognise same pulse widths.
(applies also to some models of same brand)
If both EPA and D/R settings are at 125% and the trim is at 100% full deflection in either direction, you may exceed the tolerance of the receiver (or ESC).
It is not that the receiver (ESC) is defective or that the TX is defective, it is just that in this unlikely setting situation they may be incompatible.

3. Since original setup, an early setting may have been adjusted which has impacted on all subsequent mixes/settings
made after that original setting.
". Once ATV/EPA & Sub Trim values are setup, NEVER try to reset them again later
without a complete reset of that model memory and starting the set up from the beginning. "



Please refer to:
EPA & ATV - Dual Rates differences & Cautions, BEC Problems & ESC Throttle Settings

Alan T.
Alan's Hobby, Model & RC FAQ Web Links (quick search = Ctrl+F)
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Old Oct 23, 2011, 09:20 AM
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United States, CA, Garden Grove
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Thanks for the info, will check for settings and reprogram from scratch if needed. I noticed that unwanted throttle up with aileron deflection goes away when transmitter is some distance from the model, may be some kind of "swamping" phenomena.
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Old Oct 23, 2011, 04:40 PM
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Originally Posted by E-Challenged View Post
Thanks for the info, will check for settings and reprogram from scratch if needed. I noticed that unwanted throttle up with aileron deflection goes away when transmitter is some distance from the model, may be some kind of "swamping" phenomena.
Yes an overlooked distinct possibility. Swamping is usually the first thing mentioned regarding erratic servo movements during setup.

The receiver manual recommends keeping the transmitter (50cm) 18 inches or more away from the receiver when binding. This is to prevent swamping the receiver which effect still occurs after binding, whenever the transmitter is too close and Optima may even enter failsafe mode.
(Swamping effect applies to all RC systems, 2.4Ghz & PPM)

Other Optima "error" warning signs which may assist:
Optima Transceiver (RX) - Servo Move Slower Than Usual -Rebind. Switched between Normal <> Scan mode with power off before process completed.
Optima Transceiver (RX) - Servo Wag When RX Turned On Reason & Prevention of Servo Wag (especially when switching on some ESC) .
Optima Transceiver (RX) - Servos Stepping - Battery pack (power supply) failing under load.

Alan T.
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