Tuning Guide - Revision history

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@@ Line 47: / Line 47: @@
 :'''6.''' <translate><!--T:17-->
 (OPTIONAL) When above steps are done, you can tune how sharp tail will behave. For this purpose use the '''Advanced/Rudder Feed Forward''' parameter. Value determine how aggressive the Rudder steering is. If you like quick reaction, you should set value between 6 to 8. If you like extra sharp behavior, then value higher than 10 are good for you. High value will add extra stress for servos and mechanics, so you should be carefull.</translate>
-:'''7.''' <translate> (OPTIONAL) Once you are satisfied with Tail performance and steering, the last step is to tune Stopping behavior. Use parameters located at the '''Advanced/Expert/Rudder/Stop Gain'''. There you can tune Stop Gain for Clock Wise (CW) and Counter Clock Wise (CCW) direction. Increase the value if you need more agressive stopping. Decrease if you want smoother stopping. If you want agressive stopping but there is a bounce back visible, you can reduce it by increasing '''Rudder - Stop Smoothing''' value. In that way you can reach the best performance without a compromise.</translate>
+:'''7.''' <translate> <!--T:27-->
 == <translate><!--T:18-->
@@ Line 70: / Line 71: @@
 :'''5.''' <translate><!--T:25-->
 Lastly, you might need to eliminate Elevator Bounce-Back effect. This can occur with high Cyclic Feed Forward. To reduce this effect increase '''Advanced/Elevator Filter''' parameter. Value between 2 - 3 should be fine for almost all helicopters. When using an aggressive blades you will need value of 4. Especially for bigger size helicopter, the value can be higher. In case of too high value, elevator movement can be too smooth and in some cases elevator can oscillate with low RPM during hovering. Set it only as high as really necessary.</translate>
-:'''6.''' <translate>If you reached the point when increasing Elevator Filter is not possible, use parameter '''Swashplate - Stop Smoothing'''. Stop Smoothing benefit is visible even in situation when Elevator Filter is low. At the same time you can also use '''Swashplate I-relax''' that is available in the '''3DMaster mode'''. This is helpful for extremely hard 3D flying, but for normal pilots it is not recommended or needed.</translate>
+:'''6.''' <translate><!--T:28-->
 == Unable to Tune perfectly ==

@@ Line 70: / Line 70: @@
 :'''5.''' <translate><!--T:25-->
 Lastly, you might need to eliminate Elevator Bounce-Back effect. This can occur with high Cyclic Feed Forward. To reduce this effect increase '''Advanced/Elevator Filter''' parameter. Value between 2 - 3 should be fine for almost all helicopters. When using an aggressive blades you will need value of 4. Especially for bigger size helicopter, the value can be higher. In case of too high value, elevator movement can be too smooth and in some cases elevator can oscillate with low RPM during hovering. Set it only as high as really necessary.</translate>
-:'''6.''' <translate>If you reached the point when increasing Elevator Filter can't be increased anymore, use parameter '''Swashplate - Stop Smoothing'''. Stop Smoothing benefit is visible even in situation when Elevator Filter is low. At the same time you can also use '''Swashplate I-relax''' that is available in the '''3DMaster mode'''. This is helpful for extremely hard 3D flying, but for normal pilots it is not recommended or needed.</translate>
+:'''6.''' <translate>If you reached the point when increasing Elevator Filter is not possible, use parameter '''Swashplate - Stop Smoothing'''. Stop Smoothing benefit is visible even in situation when Elevator Filter is low. At the same time you can also use '''Swashplate I-relax''' that is available in the '''3DMaster mode'''. This is helpful for extremely hard 3D flying, but for normal pilots it is not recommended or needed.</translate>
 == Unable to Tune perfectly ==

@@ Line 46: / Line 46: @@
 Tail servo is too slow (0.07s/60° or higher) - increase the '''Advanced/Rudder Revomix''' to value 1-4. Higher values are not recommended.</translate>
 :'''6.''' <translate><!--T:17-->
-When above steps are done, you can tune the Stopping Behavior. For this purpose use the '''Advanced/Rudder Stop''' parameters. Value determine how aggressive the Rudder Stopping and Steering is. If you like sharp stops, you should set value between 6 to 8. If you like extra sharp behavior, then value higher than 10 are good for you. High value will add extra stress for servos and mechanics, so you should be carefull. If you like smooth stopping so that steering is also very smooth, you should set values between 5-7. If value is too low, the rudder reaction could feel delayed. In case the tail stopping is not equal or overshooting to one side, you can decrease the Rudder Stop - A or Stop - B. Stop - A will affect stopping from Clock-Wise turn, while Stop - B will affect stopping from Counter Clock-Wise turn. Stop - A is usually smaller by 1 - 2 points from Stop - B.</translate>
+(OPTIONAL) When above steps are done, you can tune how sharp tail will behave. For this purpose use the '''Advanced/Rudder Feed Forward''' parameter. Value determine how aggressive the Rudder steering is. If you like quick reaction, you should set value between 6 to 8. If you like extra sharp behavior, then value higher than 10 are good for you. High value will add extra stress for servos and mechanics, so you should be carefull.</translate>
 == <translate><!--T:18-->
@@ Line 69: / Line 70: @@
 :'''5.''' <translate><!--T:25-->
 Lastly, you might need to eliminate Elevator Bounce-Back effect. This can occur with high Cyclic Feed Forward. To reduce this effect increase '''Advanced/Elevator Filter''' parameter. Value between 2 - 3 should be fine for almost all helicopters. When using an aggressive blades you will need value of 4. Especially for bigger size helicopter, the value can be higher. In case of too high value, elevator movement can be too smooth and in some cases elevator can oscillate with low RPM during hovering. Set it only as high as really necessary.</translate>
 == Unable to Tune perfectly ==
@@ Line 110: / Line 112: @@
 # If it is'nt at the center, use Subtrim at the Spirit Settings software to center it (Servos tab).
-Once Neutral position was set, use '''Stop - A''' and '''Stop - B''' parameters (Advanced tab) to fine tune stopping for each side separately.
+Once Neutral position was set, use '''Stop Gain CW''' and '''Stop Gain CCW''' parameters (Expert/Rudder tab) to fine tune stopping for each side separately.
 === Main rotor check ===

← Older revision		Revision as of 07:04, 2 April 2024
Line 118:		Line 118:

	For some helicopters it is possible to set one limit much bigger which usually result in pitch near 45°. This is too big and is highly recommended to use lower limit.		For some helicopters it is possible to set one limit much bigger which usually result in pitch near 45°. This is too big and is highly recommended to use lower limit.
		+
		+	In case that stopping is still not good, make sure that '''Pirouette Consistency''' and '''Rudder Dynamics''' parameters (Advanced tab) are not way too high.
		+	Usage of too high Revomix value (over 4) or Rudder Delay (over 20) can also result in degraded performance of Tail Stopping. It is recommended to start tuning with Revomix at 0 and Rudder Delay set according our Servo List table.

	=== Main rotor check ===		=== Main rotor check ===

@@ Line 111: / Line 111: @@
 Only after a proper centering change Tail push rod length to achieve correct neutral position of the Tail Mechanics.
-For the best performance make sure that there is a slight pitch between tail blades - approximately 3-4°. Tail slider should be usually closer to the tail boom.
+For the best performance make sure that there is a slight pitch between tail blades - approximately 3-4°. Tail slider should be usually closer to the tail boom. If you wish to verify tail centering you can use Gyro Rate mode - Set Stabi/Function to Disabled and use a Negative Gyro gain.
 Only after these two adjustments '''set Rudder End-points''' in the Spirit Settings software - '''Limits tab'''.

@@ Line 102: / Line 102: @@
 * If servo is too slow and there is nothing else you can do with the mechanics the only real improvement can come by using Revomix parameter. In the most cases it should be not higher than value of 4. Revomix value should be configured to be only that high as really needed. Too high value will introduce tail wag problem and other imprecision.
 * You can improve the performance by adjusting mechanical tail center position by adjusting push rod length. When tail servo arm is at the center then there should be 3-4° angle between tail blades. Tail slider should be closer to the tail boom.
 === Main rotor check ===

@@ Line 70: / Line 70: @@
 Lastly, you want to eliminate possible Elevator Bounce-Back effect. This can occur with high Cyclic Feed Forward, but it can be reduced by increasing '''Advanced/Elevator Filter''' parameter. Value between 2-3 should be fine for almost all helicopters. When using an aggressive blades you will need value of 4. Especially for bigger size helicopter, the value can be higher. In case of too high value, elevator movement can be too smooth and in some cases elevator can oscillate with low RPM during hovering. Set it only as high as really necessary.</translate>
-== If you are Unable to tune the unit ==
+== Unable to Tune perfectly ==
 In some cases even after proceeding according this Tuning Guide you can be unable to make the model to fly well. The most issues are result of poor rudder performance. This can then transfer to Cyclic whenever tail will kick to a side on its own.

@@ Line 93: / Line 93: @@
 * Faster servo will always improve Tail performance and could reduce the issue even if mechanics is not butter smooth.
 * In less common cases the hunting comes from very high Governor P gain (ESC governor) or very high Governor Response (Spirit Governor).
 === Tail kick ===
@@ Line 109: / Line 110: @@
 # Make sure that axial bearings in the main rotor hub are properly oriented. The most models require correct I/O direction. Note that even after 30 flights the axial bearings could be damaged completely. Rotor grips must move with no steps. If there are steps they must be replaced for new.
 # Make sure that a '''Ball reamer''' was used to all push rods. When you disconnect servo arms from the servos, the swashplate must move on its own depending on how you tilt the model. If swashplate will remain at the same position this will result in decreased cyclic performance. Strong and fast cyclic servos can overcome this issue in the most cases but it is always better to build the model properly.
 <div class=noprint>

@@ Line 74: / Line 74: @@
 In some cases even after proceeding according this Tuning Guide you can be unable to make the model to fly well. The most issues are result of poor rudder performance. This can then transfer to Cyclic whenever tail will kick to a side on its own.
-==== Tail mechanics check ====
+=== Tail mechanics check ===
 In order to not waste time with tuning procedure it is recommended after each build or rebuild to remove Tail servo arm from the tail servo. Then check the following steps.
@@ Line 99: / Line 99: @@
 * Make sure that Head Speed is holding correctly. If using Governor make sure the Governor Gains are not too high but not too low. Both cases will result in tail kick. Too high Governor gain can be distinguished by audiable noise coming from the motor. Your motor might be reaching higher RPM than required in that case.
 * If using only Throttle Curves without a Governor it is necessary to set a proper V-shape curve. Too high or too small difference between center throttle percentage will cause tail kick too.
-* If servo is too slow and there is nothing else you can do with the mechanics the only real improvement can come by using Revomix parameter. In the most cases it should be not higher than value of 4.
+* If servo is too slow and there is nothing else you can do with the mechanics the only real improvement can come by using Revomix parameter. In the most cases it should be not higher than value of 4. Revomix value should be configured to be only that high as really needed. Too high value will introduce tail wag problem and other imprecision.
 <div class=noprint>