Help: Skookum Governor gain ???

[jockstrap]

Folks,

Trying to get governor going on my HWC600 gasser with SK540 + statorGator

Just wondering what 3 Headspeed settings you think I should ne using for a 600 gasser for mild 3D (normal, idle1,2 modes)

Also - what is the effect of the governor gain - how should that be used?

Any help / advice appreciated..

[thefrog]

Originally Posted by jockstrap

Folks,

Trying to get governor going on my HWC600 gasser with SK540 + statorGator

Just wondering what 3 Headspeed settings you think I should ne using for a 600 gasser for mild 3D (normal, idle1,2 modes)

Also - what is the effect of the governor gain - how should that be used?

Any help / advice appreciated..

No idea what target head speeds you need for a 600 gasser (~2100??) but my experience with the governor gain is that on my nitro it's set high (~70%) versus low on my electric (~25%).

[Kaveeth]

Sorry for the hijack but on my Fusion 50 I'm running a 2200 headspeed and have governor gain at 78% and there are no adverse effects, seems kinda high.
Can I keep increasing the gain then?
Can someone tell me the governor gain they are running on a 600 sized electric?

[360Wings]

Originally Posted by Kaveeth

Sorry for the hijack but on my Fusion 50 I'm running a 2200 headspeed and have governor gain at 78% and there are no adverse effects, seems kinda high.
Can I keep increasing the gain then?
Can someone tell me the governor gain they are running on a 600 sized electric?

With the gain and h/s that high it should have stripped your gears ages ago, caused tail wag and cyclic wobble.

78% ive never heard of a gov. gain being that high... Are you sure the gov. is engaged and not just running off throttle curves?

[jockstrap]

the Skookum default gain is 50%

What effects can i expect to see with low gain vs high gain ???

[thefrog]

Originally Posted by jockstrap

the Skookum default gain is 50%

What effects can i expect to see with low gain vs high gain ???

The higher the gain the more aggressively the controller will try and maintain the target head speed. Too high a gain for a given setup and you'll get tail wag/ oscillation/ vibration.

I've found, in my limited experience, that the nitro responds better to the high gain value and the electrics are more sensitive to it. It also differs from airframe to airframe. My Trex 550 ran at ~35% gain but my Logo 500SE running as a 550 can't do more than 25% gain.

What gain % are people running? E an N? I'm curious to see the distribution.

[Seasick78]

Wondering the same thing. Using an SK540 on a 700 size Whiplash gasser. Running with the gov off for now, but also have a Stator Gator. On my CGY750 the gov hunts to the point it's uncontrollable. I'm thinking I'll start around 25% gov gain and see how she does?

[Kaveeth]

Originally Posted by 360Wings

With the gain and h/s that high it should have stripped your gears ages ago, caused tail wag and cyclic wobble.

78% ive never heard of a gov. gain being that high... Are you sure the gov. is engaged and not just running off throttle curves?

I could certainly hear the motor power changing in flight to deal with the changing load on the head. Seems that the governor was working, I'll check the flight logs to see how tightly the headspeed was holding

[360Wings]

Originally Posted by thefrog

I've found, in my limited experience, that the nitro responds better to the high gain value and the electrics are more sensitive to it. It also differs from airframe to airframe. My Trex 550 ran at ~35% gain but my Logo 500SE running as a 550 can't do more than 25% gain.

What gain % are people running? E an N? I'm curious to see the distribution.

Yes nitro will typical have higher gov. gains compared to E..

Im running 34% on my 6hv.


50% is a good starting point for nitro but way to high as a default for electric. Skookum should change the default to 20% if electric gov is selected..

[FastRunner]

Is the stator gator compatible with sk540???

[Lighty]

Originally Posted by 360Wings

Yes nitro will typical have higher gov. gains compared to E..

Im running 34% on my 6hv.


50% is a good starting point for nitro but way to high as a default for electric. Skookum should change the default to 20% if electric gov is selected..

Thanks for the heads up, can't wait to get the Gov going waiting on the Hobbywing RPM sensor to arrive to work with the CC120HV.

[jockstrap]

Originally Posted by FastRunner

Is the stator gator compatible with sk540???

Well - it's semi-working for me..

I have had the first test hovers with mine and RPM's change at idle1/2 indicating statorgator is working.. However, i have engine hunting issues and as this is my first attempt I'm trying to rule out whether it's engine tuning, gain, low rpms or even the statorgator.

I'll get there hopefully..

[desertstalker]

Originally Posted by FastRunner

Is the stator gator compatible with sk540???

Any sensor that works with the VBar will work with both SK units, so it should for sure.

[nickyd]

Tried a Gov gain increase from 30 to 50 on my Mini Titan SK720 today and all seemed good.
................................
SK Gov enabled with Manage Collective and Gain=50.
Ice 50 ESC set to non-governed (4.01 Software, Throttle End-Points, Low Timing, PWM=12, Start up=83).
................................
The SK would not initialise when I had logging switched on, so I have no data from the flight. This is strange as the SK will normally initialise with SK logging, but I got an auto-reset error (on the SK-LCD) each time I powered up with logging enabled.
I only had a quick test flight, but there was no tail wag or any untoward behaviour (except a 2 degree tail kick when switching headspeeds....no big deal).
SL worked perfect with zero swash tilt, when I enabled it on several occasions (at 200%) .
Generally seemed one of the most rock steady hovers I have had, plus a really smooth flight (light sports loops and rolls).
When I have time I will check my headspeed from the ICE 50 log and see if it maintained the SK requested RPMs.

Nick

[thefrog]

Originally Posted by nickyd

Tried a Gov gain increase from 30 to 50 on my Mini Titan SK720 today and all seemed good.
................................
I only had a quick test flight, but there was no tail wag or any untoward behaviour (except a 2 degree tail kick when switching headspeeds....no big deal).

Nick

That's interesting - that you get a tail kick when switching. The ramp should be smooth. Has anyone else had this?

[nickyd]

Just tested my Mini Titans headspeed and can confirm that it now holds at the desired 2800rpm with a gov gain=50. Holds perfect from start to finish of flight. Checked using external rpm gauge.

Previously with gov gain=30 The headspeed would start at 2750 at the beginning of the flight , then drop down to 2600 towards the end of the flight.

Guess I wont be fitting the bigger 14 tooth pinion I ordered.

Nick.

[jcflyer]

Originally Posted by thefrog

That's interesting - that you get a tail kick when switching. The ramp should be smooth. Has anyone else had this?

On my Trex 550 I get a pretty good tail kick to the left when I go from normal to idle up, it could be due to it being a belt drive and I think the belt is too tight.

[martin_]

Without gov or with some ESC internal gov, e.g YGE, the head speed change rate is very aggressive between flight mode, and you get a good tail kick, but can be easily tamed down by adding delays in your TX throttle channel, of course if your TX have that option.

I guess this will work well with SK gov.

What is the purpose of low ramp, High ramp & overdrive, can someone explain for me please, I'm about to convert my fleet to SK gov, so I try to read anything I can find on that subject.

[georgi UK]

Originally Posted by martin_

What is the purpose of low ramp, High ramp & overdrive, can someone explain for me please, I'm about to convert my fleet to SK gov, so I try to read anything I can find on that subject.

=] I actually like to see the idle up tail kick as a measure of how well the tail gyro is holding, it kicks then rapidly locks back in is what I'm looking for.

low ramp is how quickly the SK gov takes over from the esc spool to reach RPM 1 setting.

high ramp is how quickly the SK gets from RPM 1 to RPM 2 to RPM 3

overdrive is the amount in RPM's the gov will use to assist a bogged head above the set RPM,

the high ramp can be tuned to avoid the tail kick but I like it!