Robird G31 rollup

[ifheli]

Tony521,

Same here... I just pulled a BeastX and installed a G31 on a B400 using HS5065 and not one problem either...I did do a test on same heli w/ the KSt servo and it did the same thing as other heli. Drop in the 5065 and the problem is gone.

[tony521]

Keith, maybe it's got something to do with the frequency in the kst servos, and you know what, i was thinking about getting those.

[ifheli]

They are 1520 / 333. The Sat. Rx is being starved for juice. I`m ordering some capacitors to try out. I may try it inline with the G31 & SRX adaptor also.

[PhantomGT]

Originally Posted by ifheli

How would I connect it between the esc and the G31 since I`m using a SAT. RX. That capacitor is to plug into a spare port on RX. Would I use a "Y" wire between G31 & esc?.

I don`t have this issue with a normal rx just when using the SRX adaptor w/ sat. rx.

Yes, that is correct, use a Y cable. KST215 uses bigger motors like those you find in mid size servos so you need higher amp BEC to drive them compared to other standard micro servos. The brown out mostly caused by the sudden spike in voltage drop when all of them starts to move or change directions together hence the capacitor will help in this case.

[ifheli]

Thanks......

My ESC`s have 5 amps BEC. This only happens when using the SAT. RX. only. I did try plugging the SRX adaptor into the SRX 2 port and the problem becomes worse. So it may have something to do also with how the power is distributed in G31 so hopefully the capacitors will help.

[tony521]

So do you think it will be any problem if i get the kst115 instead.

[ifheli]

Tony521,

I like the KST servos. Since knowing what I know now, I would buy a capacitor when you buy the servos.. I have 6 of the G31`s and had this issue in the past but I just went to a normal Rx( since I had them on hand) and the problem was gone. I would like to go back to Sat. Rx on 450`s so this is one way to do it.

Still find it hard to believe they would pull more than 4 or 5 amps on the bench.

[PhantomGT]

Originally Posted by tony521

So do you think it will be any problem if i get the kst115 instead.

Both the KST115 and KST215 uses the same size motor, just that the 215's motor has more poles and last longer. That is why the 115 is not recommended for tail usage. You will need robust internal BEC which can really hold its voltage under load.

[tony521]

so i guess it will be ok to use the kst115 for cyclic and something like a ds520 on the tail huh?

[PhantomGT]

Originally Posted by tony521

so i guess it will be ok to use the kst115 for cyclic and something like a ds520 on the tail huh?

Ya, something like that or the 215 all round if you like.

[LawnDartHeli]

Here's a couple pic's of mine. Im gonna pick up another set of servo arms, these are spaced wide off the servo..can't get a straight shot up to the swash (see pic). Also I have the servo balls out at 16mm and you can see in the pic that the link rod runs at an angle to the swash on the elevator. It doesn't bind anywhere, I ran it up with no blades and worked the sticks...all good. Also ran the vibe log in real time and it looked very smooth.
I'm using the 3D settings as is for starters.

sent from my phone using circus midgets

[LawnDartHeli]

Im in the process of tuning the tail. Im having a slight clock wise drift (against rotor torque) Ive upped the gain to 73%, no wag, but it still has the CW drift. No trims/subtrims, mechanical is good, I didnt adjust the pre-comp on either coll or cyc...Im kinda lost here, any suggestions?

[Mikej]

Originally Posted by LawnDartHeli

Im in the process of tuning the tail. Im having a slight clock wise drift (against rotor torque) Ive upped the gain to 73%, no wag, but it still has the CW drift. No trims/subtrims, mechanical is good, I didnt adjust the pre-comp on either coll or cyc...Im kinda lost here, any suggestions?

Did you set the tail up for no drift in Rate mode?

[LawnDartHeli]

Originally Posted by Mikej

Did you set the tail up for no drift in Rate mode?

If you mean did I do the mechanical 8degrees in rate mode yes. I set the mechanical the same way I do all my birds (set rate @30%, set arms @90degree's and roughly 8degrees of pitch for counter). I forgot to mention above that I took all the software expo out of the tail. I set it back to default and it seemed to stop..although I hit lvc and had to park it. Maybe it was getting just enough signal from the stick to creep with no expo..dunno. I guess if its sensitive enough it could?

The flip rate is waaaaaaay different than when it had the RJX head and ZYX unit. Now with the dfc head and Robird it kinda flips square. Gonna take some getting used to, I had the same reaction from my 450 when I went to dfc.

It already fly's 200% better, much more stable...cyclic is very responsive. Im using Futaba S9650's on the head, running @ 6v. Had to dial in 40% expo, she was a lil' too darty.

[ifheli]

LawnDartHeli,

Good to hear you like the G31...So far I have not had a tail drift issue but I do always use a lot of expo on tail.

[LawnDartHeli]

Reloading the expo didnt help. I also backed off the pitch..still drifted. Im gonna try a different Hz setting for the tail. One site I looked at for freq settings showed the ds520 @1520/200...another showed 1520/333. I had it set for 250, and knowing that 76% Tx gain didnt make it wag..tells me the freq was too low. My Bx on my 450 wont take over 70% or it will wag like crazy. Its just odd that it drifts against the rotor, Ive never seen that unless it had trim.

*side note: with the exact same tail setup using the ZYX unit, max Tx tail gain was 67% or it would wag in FFF..has to be the Hz setting. Batts charging, will fly and see.

[LawnDartHeli]

No dice..still drifts. Im gonna disable the gov in my esc and see If that helps.


Nevermind, its fine in pitch pumps. The gov cant be doing it, Ill leave it be. I can put it in a level hover and any cyclic input makes it creep CW. Precomps maybe?..Ill try those

[Lighty]

It can also happen with vbar, I would start a new setup.

[LawnDartHeli]

Does the vbar just creep in a hover? New setup as in wipe and reset everything?

[Lighty]

I had it once, I redid the setup including a fresh bind. Try to rebind to your SAT / RX first before redoing the setup.

The tail would drift left if I remember correctly.