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Mikado V-BAR Mikado V-Stabi/V-BAR Flybarless System Software and Hardware Support


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Old 04-12-2019, 10:40 AM   #1 (permalink)
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Default Neo Vgov rpm not stable

Running Neo vgov with vcontrol on scorp esc. From low to high throttle Rpm varies than slowly settles to requested headspeed. What did i miss here?
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Old 04-12-2019, 09:42 PM   #2 (permalink)
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Are you on default settings? Does this happen in the air or on the bench? Latest Scorpion firmware and VBC updates?
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Old 04-12-2019, 11:09 PM   #3 (permalink)
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On bench and in air. Everything is on newest version. 58 scorpion. I may make a video if I can figure how to post it.
Strange rpm goes up with stick than a few seconds later is slowly goes to requested headspeed.
80a Scorp.
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Old 04-13-2019, 07:00 AM   #4 (permalink)
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Quote:
Originally Posted by Dsss View Post
On bench and in air. Everything is on newest version. 58 scorpion. I may make a video if I can figure how to post it.
Strange rpm goes up with stick than a few seconds later is slowly goes to requested headspeed.
80a Scorp.


I had my 200a do some pulsating issues. I think it was because it didnít load the default settings for tribunus when I switched from hobbywing. I ended up disabling tribunus app then reloading it to get it to load the default values for tribunus. Canít remember exactly how I did it but it was in the instructions somewhere on scorpion site.


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Old 04-13-2019, 11:45 AM   #5 (permalink)
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VBar governor does use a function calling collective addition as you increase collective, you WILL see an increase in rpm on the bench without blades/load. In the air it should not be noticeable unless your collective addition is set to high.
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Old 04-13-2019, 11:46 AM   #6 (permalink)
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So you disable the app in your vcontrol and enable it to start from scratch?
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Old 04-13-2019, 08:08 PM   #7 (permalink)
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Interesting , i will check it in the air once again ,and report my findings here. thank you
Quote:
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VBar governor does use a function calling collective addition as you increase collective, you WILL see an increase in rpm on the bench without blades/load. In the air it should not be noticeable unless your collective addition is set to high.
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Old 04-13-2019, 08:45 PM   #8 (permalink)
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Quote:
Originally Posted by Dsss View Post
So you disable the app in your vcontrol and enable it to start from scratch?


I followed the instructions to use tribunus governor then switched back to vbar governor to load default values.


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Old 04-14-2019, 07:10 PM   #9 (permalink)
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You may want to look at this thread.

https://www.vstabi.info/forum/read.php?44,138193
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Old 04-14-2019, 09:28 PM   #10 (permalink)
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Odd on that link ,even logged in says i do not have permission to view this form.
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Old 04-14-2019, 11:39 PM   #11 (permalink)
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Quote:
Originally Posted by Dsss View Post
Odd on that link ,even logged in says i do not have permission to view this form.
You need to send an email to vstabi forum so that they open the VBar Control forums for you. Only registered users of a VBC can get access.

This is what is posted there

Best preconditions are:

- blades (fold method) are at 0deg in setup (locked) position
- Cyclic Ring set up as best in hover collective point
- tail throws set in useful ranges
- paddle sim and pitch pump are zeroed
- style is at 70...100
- useful gear/kv/cell count setup for the target RPM


Step 1 - Basic Gov settings:

- Gov Gain to 0
- Gov I to 0
- Spoolup at zero collective
- dial in basic throttle unless HS matches
- go to a hover, dial in collective add unless HS will be kept under hover too
- do a medium climb, check hs, possibly add some collective add again
- set cyclic add to 1/3 of collective add
- turn back gov gain and Integral


Step 2 - Basic Tail together with Gov:

- lower tail gain (e.g. to 40)
- hover and do medium climbs
- on a CW heli - if nose turns to left in the climbs - increase collective torque precomp in tail
- if it stays approx. - the optimum has been found.
- if it still turns although the precomp is e.g. at 60 - decrease (!) the collective add of the governor (tail is overloaded by too hard gov'ing)
- set cyclic precomp to 1/3 of collective precomp


Step 3 - Tail gain:

- just increase ad needed to hold the tail. The VBars have a internal gain calculation depending on the flight situation to avoid oscillations - e.g. in fast flight.
- If the tail holds well - not more gain needed

Step 4 - Elevator Precomp:

- lower main rotor gain to 30-40 (approx 1/2 of the usual recommended gain)
- from a hover - start a climbout
- watch the tail boom. If it hangs down first - increase the precomp


All steps below can be done in different order:

Step 5a - Trim flight

- as the tail torque precomp changes the tail "center" - the TF will be done after the steps above to be perfect
- perform the trim flight on a calm day
- lift off, hover hands off for some seconds, repeat a few times
- if a hands off pirouette stays in place - end trim flight

Step 5b - Swash Optimizer:

- dial in the target agility, this resets the cyclic optimizers!
- do some constant rolls and flips in all 4 directions with approx. 50-70% of the stick throw.
- lets say 5-10 each direction will be ok, turn the optimizer off

Step 5c - Tail Optimizers:

- do some pirouettes in each direction
- also some stops (5 each side will be ok)
- turn the optimizer off
- if the stop is a bit softer on one side (due some physics) - increase the stop gain, see if it helps
- if it won't help - lower the tail acceleration which gives a bit softer response but more equal behaviour (optional, lower down to 45 ans less, often used on weak scale tails with 30)

Step 5d - Main Gain:

- increase unless you won't notice changes anymore.
- not critical - so it is possible to keep it at 80 on a usual helicopter

Step 5e - the rest:

- dial in Style as preferred (low = more smack, high = more precise)
- same with paddle sim
- and pitch pump (but - if using this - the tail will show up the limit again ...)


And of course - to be perfect - most of this can be done for each bank.
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