Carf Mephisto and Royal SRS

  • Hi Richard.

    I am setting up the CARF Mephisto and Royal SRS.

    The mephisto uses 4 servos on elevators (2 on each half), ailerons, rudder and VT.

    The elevators perform also as Tailerons when in 3D mode.

    Is there a way to setup the Royal Gyro to work on all surfaces - elevators, ailerons (including tailerons when active), rudder and VT?

    I managed to make all the setup but without the elevators\tailerons.



  • Hello,

    you have 2 elevator outputs. You need one for the vector thrust and one for the elevator. If you want tailerons mixing ax well you can do that in the gyro but you cannot turn off the tailerons.

    But my question is: why do you want to make it so complicate? If you are hovering 3D - there is no airflow: makes no sense to have taileron mixing for this ...

  • Hi Robert,

    You are right - when it hovers it is not necessary, but most of the flight is not hovering - rather than harriers, spins, snaps etc. where all the surfaces are activated. I am just looking for the best way to apply Gyro to all surfaces, as it is possible on the Cortex. I am trying to get the same effect, without installing the cortex, in addition to the Royal...



  • Hello again,

    thinking about this again this morning: the solution is very simple!

    You setup the model like this:

    Aileron-A and Elevator-B as Delta mixed in the PowerBox for the tailerons.

    Aileron-B for the wing ailerons

    Elevator-B for the Vector

    Rudder-A for the Rudder

    Rudder-B for the Vector

    Set your transmitter for normal flying:

    Flightmode 1: Normal flying: No Aileron movement for the tail aileron channel or any other setup

    Flightmode 2: Normal flying: No Aileron movement for the tail aileron channel or any other setup

    Flightmode 3: Full surface movement including tail aileron and vector movement


    FM1: Gyro off or only ratemode. 0% Gain on the tail aileron and the vector

    FM2: Gyro on, rate or heading for normal flying. 0% gain for the tail aileron

    FM3: 100% gain on all surfaces, Boost 3, no heading on all surfaces

    FM1 and FM2 - you are free in setting whatever you want - just an example

    I think this is exactly the setup you want. If you feel the vector gyro is not enough you can set the option "Gyro Sense x4" with that you can reach 400% gain - there is another post in RC-Universe: the pilot there has done that and when hovering it´s: Hands off!

    No need for complicating life with black boxes ;-)

  • Hi Richard,

    Thank you for your reply.

    Sounds great, except in this setup - in FM1 and 2 how can I stop the tail aileron from working, since the delta mode is configured in the royal itself and not in the radio.

    In my understanding in this setup the tail aileron will work all the time in all flight modes.

    Am I wrong?



  • Hello,

    no it´s off in FM1 and FM2 - you just deactivate the aileron channel for the tail in the transmitter. You should be able to do that with the flightmode switch. What transmitter is it?

  • Hi.

    I know this is a old thread but anyhow it is very relevant for me and my friend.

    We both have Carf Mephistos and we are waiting for our new PB Core radios, will the setup be exactly the same on a Core as on the Futaba?

    I am converting my Mephisto from a Emcotec/Futaba setup to PB Royal, PB 26D and the Core, my friend is setting up a new airplane and have exactly the same setup as me.

    Would be nice to know if the threadstarter had success with Richard’s setup.

    Any toughts for me and my friend Richard?

  • Hi again, another thing has come to my attantion.

    In the Mephisto there are several servos with high power output and therefore there are very high current draw potentialy when all servos work together. And here comes my stupid question.?? How many servos and how much amperege can be drawn from one powerbus port on the PB Royal. Only in the tailcone section there is 7 highpower output servos. I want to use powerbus system with the PWM adapters and splitters and potentialy only running one wire thru the plane.? Can it be done or do i have to run several wires to split the total load?

  • I have the same setup as Rocket Man, CORE and Royal SRS but in a new Mephisto. I will try to set it up as described above using delta mix in the Royal, but this is my first time with PowerBox (Royal) so learning curve is steep. The Royal manual says iGyro Assistant has “limited suitability” for models with thrust vectoring. Do I use it or not? and in the CORE do I just assign one servo to aileron and another to elevator and then everything else is handled in the Royal programming?

  • Hello,

    yes- use the assistant to fly in the model and dial the gains for a normal flight. Once that is done you can do all the vector mixes in the radio.

    In the Core you make normal elevator and aileron - the delta mix for the tailerons is done in the Royal