Mikado Vbar gain

[sgrim80]

Hey guys, I'm curious as to what gain value you have for cyclic gain on your Outrage 550 Vbar setups? I'm curious for a starting point. I don't want to lower mine too much because I'm not sure what symptom too low a gain would cause.

So what's your VBar 4.0 cyclic gain set at? Thanks!

[sgrim80]

Flew it today with a main rotor gyro gain of 35. Same problem and I didnt seem to lose anything.

Anyone flying with a main rotor gyro gain lower than 35?

[aliboy]

35 for cyclic gain is far too low. What was your problem to run such low gain?

I'm running 75, but with cyclic ring at 60 to prevent binding, and inner holes on grip arms. This gives just over 10 degree of cyclic. My servo horns were already shorter than the bellcranks to increase resolution, but strictly speaking I should go shorter to increase cyclic gain to above 80. What is your total collective pitch with 100% collective in 'main rotor' box? (measured whilst in set-up page).

Did you ever get the chance to look at your ball link clearance at the swash on the long link?

[sgrim80]

No, I have not. I didn't want to take pictures until I get this thing flying right because I may end up in the same boat as you :) This is my first crack at the VBar setup so I'm not sure I am right.

I'm experiencing a fore and aft "wobble" while I fly across the sky in front of me. I do need to move the head block to the lower hole as right now I have it in the middle hole.

Here are all of my VBar settings. Maybe you can compare mine to yours and tell me where I am way off?

Main Screen
http://i10.photobucket.com/albums/a108/sgrim80/Mainscreen.png

Main Screen Expert
http://i10.photobucket.com/albums/a108/sgrim80/MailscreenExpert.png

Setup Screen
http://i10.photobucket.com/albums/a108/sgrim80/Setupscreen.png

Setup Screen Expert
http://i10.photobucket.com/albums/a108/sgrim80/Setupscreenexpert.png

[s0laris]

ugg after looking at that last post.. I am stickign with Paddles ;)

[DominicD]

FBL guys are always talking about the latest firmware and cyclic gains, flybar guys talk about the great day they had flying :)

[aliboy]

You need to set cyclic gain either to give you 10 degree cyclic, or use the formula from Mikado (http://www.vstabi.de/tools/cge.php). Following this, set cyclic ring to prevent binding in the corners, but don't go too low or you will also restrict cyclic at full aileron only and full elevator only. Basically, Cyclic gain could be better described as 'extent of cyclic movement without affecting collective', it isn't a real gyro gain. Set this parameter too low and you will not be giving the v-bar enough cyclic to work with, but I don't think it is causing your problems.

To solve your problem you can first look at headspeed, what is it? Is it very low? Second I would look at gyro gain slider in main rotor, can you increase this without vibrations after a control input? It looks a little low at the moment. I think I'm about 45-50 on this, I'll have to check (at work at the moment). Also check your centre of gravity. The v-bar works a whole lot better when the C of G is spot on. I use a sticky aeroplane lead weight on the tail skid for ultra fine tuning if I can't get it exactly right with battery placement etc. It does make a difference and also usually means you don't need a trim flight which I hate doing! Apart from that, I can only suggest that you check your head, dampeners well lubed, ball links free, blades not too tight etc.

Good luck!

[aliboy]

FBL guys are always talking about the latest firmware and cyclic gains, flybar guys talk about the great day they had flying :)

HaHa - unfortunately there is some truth in that:oops:

BUT - when you got her dialed-in, there ain't nothing like it:YeaBaby:

[sgrim80]

HaHa - unfortunately there is some truth in that:oops:

BUT - when you got her dialed-in, there ain't nothing like it:YeaBaby:

There isnt anything like it even with this small problem. Flies leaps and bounds better than flybar already in my opinion and I only have about 15 flights on it!

I have a swash leveler coming and a hardened control rod coming on thursday. Once that stuff comes I'll go over it all including using that calculation.

[sgrim80]

All of you guys using VBar, did you put your sensor above the servos? I'm wondering if it is interference from the servos. I'm going to try some gryo tape from one of my Spartans as well when I do the re-setup.

Also, S0laris, its not as bad as you think it looks. Most of that stuff doesn't even get touched. In fact, I think the setup for flybarless is actually easier than setting up a flybar bird. :)

[sgrim80]

I just set my main rotor gyro gain back to 45. I decided to start ripping down the head and found a very notchy blade grip. I took the head apart and checked all of the bearings and the like. It was all ok. Sprayed them with alcohol to clean them, greased and re-assembled. I'm wondering if that was my problem all along?!?!!? Maybe I didnt notice it on assembly.

Now both the grips are smooth as glass. Probably won't get to test until Saturday. Keeping my fingers crossed! :)