Info Cgy - 750 Dialing Out Interactions...

Discussion in 'Futaba CGY750 FBL System' started by The Dude, Oct 20, 2014.

By The Dude on Oct 20, 2014 at 12:30 AM
  1. The Dude

    The Dude Well-Known Member

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    Before you start, you really need a dial indicator to do this right, with a sleeve that slips down over the main shaft and sits on top of the swash ball, so you can sit the leaver of the dial indicator on the top of the sleeve. Then viewing the dial indicator window, you can dial out the interactions. Some people also mark the shaft with a marker, but it's not as accurate and gets very messy very quick.

    1. Enter the Swash Menu and go to NTR This locks the model's servo in exact neutral

    2. Locate the mounting point for each ball link on the servo driving the swashplate at EXACTLY ninety degrees relatively to horizontal. Theoretically, this should be ninety degrees to the long axis of the servo's case. In achieving this geometry, the use of subtrim in the cgy should be avoided if at all possible. normally it's not.

    3. Adjust the pushrods going from the servos to the swashplate so the swashplate is EXACTLY level and square to the models mainshaft from all orientations. At this point, set the desired half stick collective pitch in the rotor blades. For a 3D model, this will be ZERO degrees. For a contest model, the center stick position may be plus a few degrees depending on pilot preference.

    4. Going back the SWASH menu. There you will see NTR and SWASH AFR.

    Under usual circumstances, the NEUTRAL POINT (NTR) menu will not need to be manipulated. Per your model manufacturer's recommendations or your own preferences, set the AILERON SWASH AFR for the MAXIMUM desired amount of aileron cyclic (roll) pitch. 6-7 degrees is a good starting point. Repeat this for the ELEVATOR SWASH AFR. 6-7 degrees (gives a value of around 9 when you exit the swash menu ).

    5. Enter swash expert Move the collective stick up and down and note how the boxes on the various mixing function alternately become highlighted. When a box goes white, it is open for adjustment.

    6. Place the collective stick at maximum pitch. Adjust the highlighted box under PIT to AIL until the swash sits level WHEN VIEWED FROM THE FRONT OR BACK OF THE MODEL. Lower the collective stick fully. Using the now highlighted box next to the one that you just adjusted, repeat the procedure once again viewing the model from either the front or rear.

    7. Return the collective stick to maximum. Adjust the highlighted PIT to ELE box until the swash sits perfectly level WHEN VIEWED FROM EITHER SIDE OF THE MODEL. Lower the collective stick fully as before and repeat this procedure for the now highlighted box, once again adjusting for a level swash when viewed from the side of the model.

    8. Position the collective stick to half. Move the elevator back and forth and watch as the ELE to PIT adjustment boxes in the MIXING RATE area flash back and forth. Also note the center pivot ball of the swashplate is likely moving up and down a bit as you apply the fore and aft elevator command. Adjust the highlighted box in the ELE to PIT menu so the fore and aft elevator commands do NOT cause the swashplate's center pivot ball to move up and down.

    The AIL to PIT adjustments can be found to flash back and forth as left or right aileron commands are input. The collective stick should still be at half. Similar to the way the swashplate's center pivot ball moved up and down with elevator commands, left and right aileron commands may cause the same movement. After determining which adjustment box corresponds to left and right, adjust each as needed until the swashplate's center pivot ball no long rises and/or falls with an aileron command.

    After adjusting the ELE to PIT and AIL to PIT functions, the swashplate's center ball should remain more or less still when aileron or elevator commands are input at the half collective stick position.

    9. The final MIXING RATE function to adjust is the ELE to AIL. With the collective stick still at half, move the elevator stick back and forth while viewing the model from the front or rear. The goal here is to have the swash remain level as to tilts back and forth with the elevator command. By nature, it is more difficult to tell if the swash is tilting left or right with the elevator commands.

    In simplest terms, the LINKAGE COMPENSATION functions are used to adjust out interactions that occur at high and low collective ranges. Place the collective stick at maximum. Move the aileron control left and right and note the way the swashplate's center pivot ball moves up and down. Adjust the boxes corresponding to left and right aileron commands under AILERON until the swashplate's center pivot ball sits more or less motionless when left and right aileron commands are input. Repeat this same procedure for the aileron commands when the collective stick is at full low. You may need to play around with the values in multiples greater than one until you get things close, then go one percent at a time until you get it just right. The radio will allow you to get things just about perfect, so be patient.

    The ELEVATOR adjustments under LINKAGE COMPENSATION work exactly as they did for aileron, except here you adjust the highlighted boxes as needed until your swashplate's center pivot ball sits more or less motionless at full high or low collective stick positions when elevator commands are input. When the AILERON and ELEVATOR commands under LINKAGE COMPENSATION are correctly adjusted, your swashplate's center pivot ball will remain basically still at high or low collective positions as you apply aileron and/or elevator commands.

    The last swashplate tuning feature to adjust is the SPEED COMPENSATION. This feature adjusts out interactions inherent to 120 degree eCCPM when RAPID elevator commands are input. A good starting value is 15%. Adjust this percentage up or down until your swashplate's center pivot ball stays more or less still as you cycle the elevator stick back and forth. Try to move the stick back and forth at some reasonably realistic and consistent rate to most accurately fine tune this adjustment.



    NOTE: Basic idea !

    After adjusting the ELE to PIT and AIL to PIT functions, the swashplate's center ball should remain more or less still when aileron or elevator commands are input at the half collective stick position.

    Then there are the other settings to adjust too. REALLY IMPORTANT TO CHECK THIS BIT!

    Quick side note...as an example: ELE-AIL (in this case, when ELE is moved, adjusting the numbers will make the AIL [swash bank or roll] tilt left or right as needed).

    So, if you pitch aft and the heli tries to bank or roll left or right, you would adjust this setting to compensate..

    Important to keep in mind I believe is THIS SHOULD BE DONE BY FLIGHT TESTS, AFTER GETTING THE HELI AS PERFECT AS POSSIBLE ON THE BENCH.

    Side note: Some of this info is hashed together from all over the net, I have been playing with this for awhile and had many notes, I cant remember where it all came from ... But thats the step by step procedure i have been using now, edited to make more sense and bits added.

    Once you know how to do this , it only takes about 30 mins.. but the difference it makes is very noticeable and well worth the effort.. i will adjust the instructions as time go's on, but it's pretty right now ..
     
    Last edited: Oct 20, 2014
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Comments

Discussion in 'Futaba CGY750 FBL System' started by The Dude, Oct 20, 2014.

    1. smakmeharder

      smakmeharder Administrator

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      Dude this is awesomeness information overload!.. Does Vbar do this? Or is it automatic @3dmick ???
       
    2. Stuart

      Stuart Active Member

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      @dude do you offer a setup service? I gave two helis with cgy750's but not confident in making the adjustments ....
       
    3. 3dmick

      3dmick Well-Known Member

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      V-bar is automatic its gyro magic lol
       
    4. smakmeharder

      smakmeharder Administrator

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      LOL..... I wonder about this mr @3dmick ... We will do a test next time we meet ...
       
    5. 3dmick

      3dmick Well-Known Member

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      Ok smackme no worries
       
    6. smakmeharder

      smakmeharder Administrator

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      If VBAR does do this @3dmick, i will be very impressed!
       

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