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HomeAircraftHelicopterFlybarless Rotor Head SystemsSkookum › 360 - lost post
10-25-2009 06:41 PM  8 years agoPost 1
stocky

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Taxachusetts

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When I was first setting up my SK360 I read here on RR a quote from the Skookum site that stated something like..

"If the helicopter bobs up and down like a Dauphin adjust the ......"

Last time it helped but I can't now find that quote here or on Skookum site, and can't remember what the ..... adjustment was.

Thanks for the help.

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10-25-2009 09:09 PM  8 years agoPost 2
MrMel

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Gotland

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Could it be this your looking for?

From the manual;

While in high-speed forward flight,
the heli pitches up or down
momentarily.

>> Pitch damping gain is too low.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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10-27-2009 12:18 AM  8 years agoPost 3
stocky

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Taxachusetts

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It wasn't, 100% the text contained "Dauphin"
It may turn out that this is the same thing anyway.
Thanks for trying

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11-05-2009 03:33 AM  8 years agoPost 4
JWatson

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Mustang, OK

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I believe that is a text quoted fron http://www.heli-rnd.com under Sk360 Flight tuning. Here : http://www.heli-rnd.com/Skookum/SK_..._reference.html

Basic tuning steps

1. Slowly take off (not to give any cyclic input before actual taking off)

2. In a stable hover, test the cyclic control by giving very small input to all directions

3. if the heli slight drift in hover, you need a higher Hiller gain but please do increase "progressively" until a solid hover. The heli may oscillate as you would have on a tail gyro, the gain is then too high. You can adjust individual cyclic control Hiller gain if only one axis osciallates

4. In a stable hover, give the heli a rapid elevator input and center again sharply

* if the heli starts slowly, turn up the Bell gain
* if the heli bounces a few times before coming to a hover, turn down the Bell Gain

5. In a stable hover, sharply increase the collective pitch and observe if the heli tilts to any direction, if the heli tilts:

* nose up - tune down the elevator tail drag compensation under Advance tab and vice versa
* right - tune down the aileron tail drag compensation and vice versa

6. Test a fast forward flight, if the heli bounces like a dauphine, nose up and down, turn down the elevator dampening gain under "control" tab

Now you are basically set, in case you need faster cyclic roll, increase the control rate under "control" tab, the heli can roll as fast as 360 degree/second provide that sufficient cyclic pitch is available; hence, about ten degree cyclic pitch is recommended. However, you need to increase relative bell gain proportionally;

For example: Control rate increased from 210% to 260%, Bell gain is 30%, then Bell gain should be increased to :

30% X 260 / 210 = approximately 37%

Other settings are

Hiler Decay - increasing Hiller Decay will increase the stability of high rate piro and better tic toc. This will give a feel of flying heavier main blades

Use Base Gain Directly - select this option will simply disable both pots on the gyro, all gains are set via the software

Use Gain Channel Input - The left over port on the gyro is reserved for two band set up, you can connect it to any available channel and select "Use Gain Channel Input" under control tab. In this mode, you can swtich between two pre-set profiles with one at each side of the channel signal. Both the pots on the gyro will become Bell gain for each profile and the Hiller gain is now adjustable by changing the ATVs

There is an FAQ about the relationship between Gains and Actual Gain. This is only a matter of presentation to show the relationship between the elevator gain and aileron gain.

For example: if you have an actual Bell Gain of 30%, the elevator and aileron gains are 30% and 40%...

Increasing 5% of Bell Gain by turning the pot will increase the elevator gain from 30% to 35% when the aileron gain increases to (40% / 30 X 35) = approximately 46%, same applies to other gains

More set up tips are available in the download page.

Hope that helps,

Jarrett

Jarrett Watson
http://jarrettrc.wordpress.com/

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11-07-2009 09:45 PM  8 years agoPost 5
stocky

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Taxachusetts

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YES!!! That's the one.
Thanks a million

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11-08-2009 02:41 AM  8 years agoPost 6
JWatson

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Mustang, OK

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Cool, Glad I could help!

Jarrett

Jarrett Watson
http://jarrettrc.wordpress.com/

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