[NSRCA-discussion] Un-commanded rudder sweep during flying session pre-flight checkout
Vicente Bortone
vincebrc at gmail.com
Tue May 30 10:34:35 AKDT 2023
Hi Mike,
I haven’t use voltage regulators in many years. I suggest that you go
straight to Rx.
Best regards,
Vicente “Vince” Bortone
On Sun, May 28, 2023 at 3:59 PM Michael Cohen via NSRCA-discussion <
nsrca-discussion at lists.nsrca.org> wrote:
> OK NSRCA list, got a weird one to run by the Pattern hive mind to see if
> anyone has any ideas. My plane has two FlexReg PLR5 Tech-Aero Voltage
> Regulators and batteries for redundancy. My typical flying session
> pre-flight checkout involves turning one on at a time and sweeping all
> surfaces. Today, the rudder swept back and forth after I stopped a
> similar command from the transmitter on the first regulator I turned on.
> Maybe my leads were not fully seated??? I unplugged and re-plug both
> regulator leads at the receiver and the problem went away. Today, when I
> got home, I decided to replace the regulator causing the issue with one
> from a backup plane and did my sweep checks. The following was always
> performed with only one regulator plugging in at a time and without the
> wings on.....
>
> 1. With the replacement regulator (R1) plugged into channel 8, the
> rudder kept sweeping back and forth un-commanded (after I stopped). The
> elevator was fine.
> 2. Moving from channel 8 to 7 (R1), the rudder kept sweeping back and
> forth un-commanded. The elevator was fine.
> 3. Plugging the same battery (B1) into the other regulator (R0) that
> has always been in the plane into channel 8, both rudder and elevator we
> fine.
> 4. Moving from channel 8 to 7 (R0), both rudder and elevator we fine.
> 5. I repeated steps 1 & 2, the rudder kept sweeping back and forth.
> The elevator was fine.
> 6. Grabbing the OTHER regulator (R2) from the backup plane and
> repeating steps 1-4 above yielded the same results.
> 7. I removed the regulator (R2), leaving the original (R0) and the
> original backup (R1) in the plane
> 8. Hooking up a second battery (B2) and cycling back and forth between
> the two regulators, once switch at a time, there we no issues.
> 9. There were also no issues with both packs on at the same time
>
> Based on the above, the problem did not follow anything in particular.
>
> B1 + R1 + 7 = *X* (rudder sweep)
> B1 + R1 + 8 = *X*
> B1 + R0 + 7 = *Y* (rudder fine)
> B1 + R0 + 8 = *Y*
> B1 + R2 + 7 = *X*
> B1 + R2 + 8 = *X*
>
> B1 + R1 + 7 OR B2 + R0 + 8 = *Y*
> B1 + R1 + 8 OR B2 + R0 + 7 = *Y*
> B1 + R1 + 8 AND B2 + R0 + 7 = *Y*
>
> Thoughts???
>
> Since this is a Futaba R7008SB receiver, I could ditch the regulators and
> just go straight into the receiver (did not try that yet).....
>
> Regards,
> Mike C
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--
Vicente "Vince" Bortone
*NSRCA 1140. Be Proud to show your NSRCA #*
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