Anfänger braucht Hilfe bei Skookum 720

[Brainworm]

Hallo Heli Kollegen ,
ich fliege (ca. 3 Monate) einen Rex 450 und einen Atom 500.
Beides mit VStabi.
Bin also noch ein ziemlicher Anfänger was Heli's angeht.
Jetzt ist der neue Compass 7HV dazu gekommen und ich hab ein SK720 verbaut.
Als VStabi verwöhnter Benutzer komme ich mit dem Setup nicht ganz zurecht.

1. Frage:
Welche Werte sind für Cyclic Gain und Tail Gain für nen 700er sinnvoll bzw. was bewirken die genau? Aus der Anleitung werde ich nicht ganz schlau.

2. Frage:
Das Heck verhält sich etwas anders als ich es vom VStabi her kenne. D.h. wenn der Heli steht und steuere Links/Rechts fährt der Heckservo nach ca. 1 Sek wieder langsam auf die Mittelstellung. Erst wenn ich den Heli anhebe scheint das Heading Hold zu greifen und der Servo bleibt stehen. Ist das normal?

3. Frage:
ßhnlich wie Frage 2, betriff hier die TS. Wenn ich den Heli nach li./re. rolle oder vo./rü. neige, steuert die TS wie im VStabi dagegen, aber auch hier fahren die Servos nach kurzer Zeit wieder in Mittelstellung. Ist das normal?

Vielen Dank für eure Hilfe

[Renatuzz]

AW: Anfänger braucht Hilfe bei Skookum 720

Hallo Brainworm,

zu Frage 2 und 3 kann ich Dich beruhigen, beim Kippen oder Drehen laufen nach der ersten Ausgleichsreaktion die Servos wieder in die Normalstellung zurück.

zu Frage 1 kann ich Dir nur meine Helipro Alien 600 Werte zurufen (Cyclic Gain=64%, Tail Gain=25%). Aber das hängt natürlich vom Heli ab, man startet lt. Anleitung mit 50% und schaut sich den Heli in der Luft an und möglichst auch die Vibarations-Log-Files. Diese Gains steuern die Gesamt-Empfindlichkeit/Stabilität von Kopf und Heck und sollten am besten über die Funke variert werden. Ach ja Du wolltest es ja genau wissen...
----
SK720 Gain Relationships
As I had promised, I spent some time with the SK720 to figure out exactly what the relationships between the Cyclic and Hiller Gains are and how they affect each other. I have tried every conceivable combination and it looks like the rules I have come up with hold true.

It does not matter whether we are talking about Cyclic Gain set remotely from the TX or have a value "Locked" in the software. It behaves the same with either. When I refer to Cyclic Gain, it is the value in the "Lock Cyclic Gain to:" box or via Travel Adjust endpoints in your TX (Not sure if all of this holds exactly true for Futaba ATVs as I fly JR. I also do not use the GYRO menu as I feel this has less resolution than using endpoints.) When I refer to Hiller Gain, it is the values in the boxes on your Cyclic tabs. What your heli actually uses, I will refer to "Flight Gain" and is the Hiller Gains in the Flight Gains Matrix. This is nothing that you really need to know to get great performance from the 720, but is for the guys like me that want to know exactly how something works.

Hiller Gain Range: 0 to 100

Cyclic gain Range: 0 to 100 via the software, 15 to 150 via TX endpoints. (Below 15
endpoint will not affect Flight Gain, although 0 will switch you to the other Bank.)

Maximum Flight Gain is double Hiller Gain up to 200%

Flight Gain changes in porportion to the formula of:
The (difference in Cyclic Gain from 50%) x 2 x Hiller Gain + Hiller Gain.

For example: If Cyclic Gain is 60% and Hiller Gain is 40%, Flight Gain will be 48%.
60% - 50% = 10% x 2 = 20% (or .2) x 40% = 8, 8 + 40 = 48%.

The only way you can have different value on Elevator and Aileron Gains is to set different values in the Hiller Gains boxes. Once you do that, the higher value is controlled as per the above formula. The lower value the maintains the same percentage difference. For example, if you have 40% Elevator Hiller Gain and 60% Aileron Hiller Gain set in the Cyclic tab, 40 divided by 60 is .66666. If you then raise your Cyclic Gain to 70, your Flight Gains will be 56% and 84% respectively. (.66666 x 84% = 56%) Again, the higher value is affected by the formula and is controlling. The lower value is a percentage of the higher value.

I have not downloaded and read the new manual, but is seems at least in the new firmware the the "Cyclic Gain Channel Also Scales Damping Gain:" formula in the original manual is not correct. This feature is always active, even though there is not a check box for it as was discribed in the original manual. The Damping Gain Scaling appears to follow the same formulas I listed above.

Just for those that have not seen my posts on Tail Gain relationships, they behave differently from Cyclic Gains, so I will include them here.

Tail Gains are a multiple of the Tail Gain set either by your TX Travel Adjusts or the "Lock Tail Gain to:" box and the values in Rate Gain, Hold Gain and Accel Gain boxes. For example, if you have 80% Rate Gain, 60% Hold Gain and Travel Adjust for the Tail Bank set to 50%, your Flight Gains for the tail will be 40% Rate Gain and 30% Hold Gain. The range of values for the different tail gains are:

Rate Gain: 0 to 100
Hold Gain: 0 to 100
Accel Gain: 0 to 20

For a Tail Bank to be a Heading Hold Bank, you must have a value greater than 0 in the Hold Gain box. A value of 0 in the Hold Gain box makes it a Rate Mode Bank. Rate Gain is the primary gain for the tail. It would not matter how high you have the value in the Hold Gain box, if you set the Rate Gain box value to 0, you will never get the tail to hold. Rate Gain determines how strongly it holds against an angular displacement, Hold Gain determines how strongly it holds against a change in heading.
---------------------

Naja alles habe ich auch nicht verstanden. Viele Infos zum SK 720 findest Du übrigens bei Helifreak (auf Englisch). http://www.helifreak.com/forumdisplay.php?f=118

Ciao René