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HomeAircraftHelicopterFlybarless Rotor Head SystemsV-Bar › Stop gains.
04-06-2010 03:19 AM  8 years agoPost 1
rotormonkey

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Ottawa, ON - Canada

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The stop gain options in the vbar setup software are regrettably named "stop gain A" and "stop gain B". When I piro to the left, the tail is a bit bouncy/mushy, whilst right is fine.

Normally I'd just set them to a ridiculous value to find out which way is which, but I don't want to strip gears, or end up piroetting uncontrollably.

Is there any safe way of finding out which is which?

BTW: I just finished maidening the vbar this weekend. WOW. Other than the tail being a little soft one way that thing flies AMAZING! Much better performance than the SK360 I had on that ship before. Tres cool

If it can't hover, it ain't worth flying.

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04-06-2010 03:26 AM  8 years agoPost 2
Justin Stuart (RIP)

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Plano, Texas

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I like hard stops, and so I think I have 25 on each side. I started with about 10 and just moved up 1 click at a time until it was how I like it both directions. If one side is 10 and the other is 15, you can notice a difference.

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04-06-2010 07:50 PM  8 years agoPost 3
rotormonkey

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Ottawa, ON - Canada

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I too like hard stops. And when piroing to the left, it stops plenty hard, it's just to the right seems sloppy and loose. My concern is that I don't already know what A or B mean. If I turn A up to say 25-30, and it turns out to be the left stop, then I don't wanna blow out gears. If B is right, I don't really know what to expect with a lower stop gain. Just curious if there's an easy way to find out which is which.

Or if not, what happens when the stop gain is really low?

If it can't hover, it ain't worth flying.

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04-06-2010 08:04 PM  8 years agoPost 4
Justin Stuart (RIP)

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Plano, Texas

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If you turn the the stop gain to like 10, you piro and release the sticks, and it takes about 15 degrees to stop. Nothing more. Just very mushy.

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04-06-2010 08:05 PM  8 years agoPost 5
Kiba

rrApprentice

CA

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Did you turn the tail optimizer on and then fly the heli doing about a dozen piro hard stops in each direction? That will autotune the stop gains for a quick stop with no bounceback.

If it still isn't stopping hard enough for you after that then move on to the "adjust, fly, adjust, fly" routine.

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04-06-2010 08:42 PM  8 years agoPost 6
rotormonkey

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Ottawa, ON - Canada

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Justin, thanks, that makes me feel a little better. Just didn't want to end up piroing uncontrollably.

Kiba: Yes, I did have it turned on, but I don't know that I did a whole lot of hard stops when flying around. To be honest, I forgot all about that auto learning feature. I'll give that a whack first.

If that doesn't work, then I'll just start lowering one side to find out which is which. Thanks again guys.

If it can't hover, it ain't worth flying.

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04-06-2010 09:46 PM  8 years agoPost 7
MrMel

rrProfessor

Gotland

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Please note that Acceleration parameter does more for stops then stopgain, specific if you feel your "timing" is off compared to other gyros, it's the acceleration parameter you should tweak (most likely raise)

Pretty sure Stop gain A = CCW and B = CW, but I could be wrong, about 50% sure

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

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04-06-2010 10:44 PM  8 years agoPost 8
rotormonkey

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Ottawa, ON - Canada

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Eh? The acceleration parameter tweaks the stop? Please explain. Based entirely on the name, I'd assumed that's how quick it would accelerate the tail when starting a piro rather than stopping. What exactly does acceleration do then? Apparently not what I thought?
Pretty sure Stop gain A = CCW and B = CW, but I could be wrong, about 50% sure
Now that actually made me laugh... Funny

If it can't hover, it ain't worth flying.

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04-06-2010 10:56 PM  8 years agoPost 9
Justin Stuart (RIP)

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Plano, Texas

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I think both acceleration and stop gain control the stops, but acceleration does more than just control the stops.

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04-06-2010 11:17 PM  8 years agoPost 10
rotormonkey

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Ottawa, ON - Canada

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Okay, what's the difference then? What does "more than just control the stops" mean? What else does it do?

If it can't hover, it ain't worth flying.

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04-07-2010 12:01 AM  8 years agoPost 11
Justin Stuart (RIP)

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Plano, Texas

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There are entire books written on how PID systems work, but if I understand it correctly, the stop gains somehow factor into the acceleration gain. MrMel could probably elaborate further as he understands the system much better than anyone else on here.

Have you ever looked at the V-stabi 3.16 software? It is complicated how all of the gains interplay. Here is a screen shot of the elevator and aileron control loop as an example of the interplays between the different gains. I don't have a screen shot of the tail.

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04-07-2010 12:25 AM  8 years agoPost 12
Maxime30

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Quebec City, Canada

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04-07-2010 02:12 AM  8 years agoPost 13
rotormonkey

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Ottawa, ON - Canada

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Great link Max, thanks! It did explain very well what the acceleration is all about. I thought that's what the stop gain did, but apparently not. So what exactly does the stop gain do then? How does it differ from acceleration?

If it can't hover, it ain't worth flying.

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04-07-2010 06:47 PM  8 years agoPost 14
MrMel

rrProfessor

Gotland

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It allows you to fine tune the different directions.

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

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