New Volocity 50 N2 with a bad case of the shakes

[flyboydave]

Hi all,

My new Volocity 50 N2 has a bad case of the shakes, now the people helping me with it suggested that the head dampers needed to be greased, Wich they were when built, Now I have stripped the head down, replaced the dampers with the X3d 90 one's, R50N937-ss.
No, the wobble or shake is still there just the same, it has a decent head speed and good quality Edge blades on, so i'm thinking its not the head.
Has anyone else had this problem and if so how did you solve it, or has anyone got any ideas on what it might be?

[flyboydave]

Up date, I have had the engine out and replaced the cooling fan, Its still shaking :-(

[liam-b]

i am gettin hi res vibes with mine ;\ making the fuel froth like mad and am spin blades balanced its all tracked head speed is 2100 :\ i had really bad vibes but that turned out to be me that had not aligned the engine and clutch properly sorted that all out and i still have my problem

[flyboydave]

I did read your post, mine runs the tank dry, in fact the engine is runing very sweet! but the whole heli shakes, you can see the skids really doing it and in turn it gets a right old wobble on!!

[kw_rc]

Last time this happened to me my header was loose. Give it a look.

Sent from my GT-P5113 using Tapatalk 2

[dunkonu23]

What is your head speed? Generally, with hard damping, below 2000 will induce shakes as you describe. On my V1, it shakes until about 1950 then it smooths out for its final speed of 2050. So, either softer damping or higher head speeds.

Scott

[flyboydave]

The head speed must be over 2000 in idle up 2 but its not had a tacho on it yet. Its got the bottom of the v curve about 70% , I have got the red softer head dampers to try in it, but what worries me is that will all the problems people have talked about with this model on here this problem I have is not one of them....
I have tried the head dampers that come in the kit and the 3d 90 deg ones, do I need to change these for the softer red ones or is it a problem else where.
One thing worth noting is that when the skids are on the ground and its just getting up to lift off speed there is no sigh of it, but as soon as it lifts off then its away.

[liam-b]

Mite be worth checking your set up again I would make sure the blades are balanced. And are tracked 100 %. I get a digital pitch gauge PU it in set up menu so the swash is level and check it at mid stick with a ditital pitch gauge also check the top and bottom ends. Could be something sime like that And if you have vbar check your. Log for any issues and vibes. =]

[dunkonu23]

If you don't know the head speed you can't make a judgement on damping for this helicopter. My suggestion is to go with the red's at this time and see if there is an improvement. Next, I would strongly suggest getting a governor like the Multigov pro where you can set head speeds for each flight mode or at the VERY least have someone with a reliable tachometer get your head speed in flight and adjust accordingly.

Your indications are typical of hard damping and low head speed.

Scott

[flyboydave]

Thanks Scott,

Its got one fitted as part of the cgy750, just not set yet as I wanted to run the engine in before using the gov.

[robi1kenobi]

My Velo (first version) shakes too. Badly.
My curve in idle 2 is 100-40-100. I'm running it on 15% nitro, so it doesn't have enough power (ys56sr) but HS is around 2000 (tached it)
Don't know what's the problem, blades are balanced, tracking is great, tried tightening/loosening blades in holders.
Will try it with the governor this weekend and see how it goes, but I guess it won't improve.
My Velo is all stock (so are the dampeners, they are oiled so that's not the problem)
I'll try to change clutch bell and engine fan, but first I'll change spindle and mainshaft

[dunkonu23]

Try 2050 for the head speed. Seriously, guys this is a standard problem with lots of larger helicopters. With smaller helicopters, low head speed and hard damping, you usually get boom bouncing up and down. With larger helicopters, you get shake. I get shakes in normal at 1750 and in idle 1 at 1950 but at idle 2 governed at 2050, it's smooth as a baby's butt. A lot of folks fly more head speed as well and it's still smooth.

Scott

[robi1kenobi]

Thanks Scott, I hope that will solve it! Have to start running governor... But I can't mount sensor (Spektrum backplate) on my YS, don't have 1.3 mm hex. Sensor is too long, I'll have to sort that out before weekend
Man I hope higher headspeed will solve shakes, it's pretty annoying and I don't like to watch my Velo shake in the air, just waiting for the moment to disintegrate itself

[dunkonu23]

I have a Spektrum backplate sensor on my YS-56. Either higher head speed or softer damping, your choice, sir.

Scott

[robi1kenobi]

I bought one with mini connector, and it's kinda too long so I can't mount it
Well, I prefer higher head speed

[flyboydave]

Quick update,

I have now flown it with the 80 deg softer head dampners fitted and the problem is still there, apart from the blades I just don't know what to look at next :-(

[dunkonu23]

Flybar or FBL? I can't help but think without knowing your exact head speed you're trouble shooting something that should be easy to find--if only you knew your head speed.

You sure nothing is bent?

If FBL which unit?

Scott

[ChadL]

Originally Posted by dunkonu23

If FBL which unit?

Scott

From a previous post

Originally Posted by flyboydave

Thanks Scott,

Its got one fitted as part of the cgy750, just not set yet as I wanted to run the engine in before using the gov.

I suspect the shakes you're trying to resolve are with the CGY 750. The current firmware, V1.2, seems to suffer from the shakes with the "stock" settings. I would suggest visiting the CGY750 sub-forum and do some reading on what settings to adjust and see if it helps. For some it helps, others it doesn't. The RR site also has a good read called Consolidated V1.2 tips.
I've been waiting for Futaba to release new firmware to hopefully address these well known issues, but nothing yet.

[flyboydave]

Yes,

That thats the conclusion I have now come to, playing with diff settings seems to have improved it!! Just have a bad bounch on the elv now!!
The more I looked into it the more info I found on the cgy750, which I wish I had before I started tearing the heli apart :-(
I am struggling to set up the gov now, any help here would be good!! I'm new to this Sbus thing and I can't seem to get the gov working on the idle up switch, the first part of the instructions tells you to check its changing the number on the unit, How do I do this? I am using an 8fg super.
Any idea when Futaba will be fixing this firmware problem?

[ChadL]

For the gov you first need to make sure you've selected Gyr+Gov on the CGY unit. It's not the stock setting so if you haven't done this yourself this may be the source of your problems. Scroll through the screens that shows the voltage coming in, aileron gain, etc. and you will eventually come across settings for gyr+. I can't recall what the stock setting is, something like gyr+opr or gyr+esc, but whatever it is you need to change it to gyr+gov. Once you've done this there will now be a menu for the governor much like rudder, elevator, aileron, etc. In the gov menu is where you will enter your gear ratio, stick switch position for the governor, idle and high throttle position, etc. This is also where you'll see the RPMs change when you change to IU1 and IU2.