blade 450x with kbar mini??

[dp340]

Hi I have a 450x with a kbar mini,spektrum satellites and a dx6i,I am having real trouble setting the kbar up,i have gone through all the stages but when i get to the servo bit the elevator is opposite to how it should be,i cant reverse any tx settings at this stage as the tx and kbar were set up for correct directions in an earlier stage of the software and if i reverse all the servos to make the elevator correct at the servo stage then the aileron and collective are opposite the tx is set to 1 sero 90 degrees as the 450x recommends and the servos are plugged into the channels the software recommends,please help i am pulling my hair out!! DSC_0492.jpgDSC_0493.jpgDSC_0494.jpgDSC_0491 (1).jpg

[bigpops]

First off, are all the controls reading correctly in the transmitter tab?

IE. 0 in the centre, the +100 and -100 in the correct directions? So when you push the elevator stick, the elevator bar goes towards "Push" on the software?

Is the swash collective direction correct? I think the 450X is trailing edge control, so swash plate down for positive pitch. That also needs setting in the software.

If those are correct, and you have indeed connected the servos as in the diagram you've pictured then it should work. On the swash servo reversing screen, make sure that when you give positive collective that the swash goes down with all 3 servos. Once they do, aileron and elevator should work as expected.

[Raving Jim]

Try revering servos in the correct menu untill all 3 go together an remember your swash should be going down for positive stick input , aslong as all servos are in correct port as the swash menu shows it will work by reversing either of the 3 in the cyclic menu .

[dp340]

hi thanks for your help,yes the bars move in the right direction and set to +/-100 and the swash is set to go down for positive and the swash goes down with all three and set to clockwise rotation but when I push the elevator on the tx the swash moves up at the back,so putting negative on when the blade is at the back,although I am quite new to 6 channel I have experience with other types of heli and a good understanding of mechanical engineering but this just isn't working the way it should,I have tried to hover this heli just to prove that it is working opposite and it is???

[bigpops]

If you push the stick forward, and the swash goes up at the back and down at the front, then that's correct.

Forget the "pitch on the blade at the back". You don't want more lift on the blade at the back to go forward. Doing that you'll actually get a right aileron roll. It's called gyroscopic precession.

The swash should tilt the direction you push the stick. So you push forward, the front goes down, the back goes up. Same for left and right. Push left and left goes down, right goes up. It's quite simple really.

[dp340]

Thank you,gyroscopic precession!!I'm learning all the time,this would explain a lot,so am I right in thinking if this had leading edge control then the even though the swash would lift instead of lower for positive collective the swash would lower at the back for forward movement because of gyroscopic precession,so it takes 180 degrees for the blade position to have effect?

[Grumpy]

You might have channel two and three reversed on the Kbar sockets.

The swash should always tilt in the direction you want the heli to go, so swash lowers at front and raises at back, the helis nose will drop and tail will rise etc.

[dp340]

No,I was using leading edge as an example because it makes swash movement Seem more straightforward so just reverse it for trailing edge control,as far as I can tell due to gyroscopic precession and with trailing edge control if the swash tilts forward the heli won't tilt back but tilts to the right?I'm going with bigpops on this one,I'll try it tomorrow.

[tomatwalden]

Thank you,gyroscopic precession!!I'm learning all the time,this would explain a lot,so am I right in thinking if this had leading edge control then the even though the swash would lift instead of lower for positive collective the swash would lower at the back for forward movement because of gyroscopic precession,so it takes 180 degrees for the blade position to have effect?

Watch this ... (PS. It's not actually gyroscopic precession in helis, but phase lag, which looks, smells and reacts like gyroscopic precession) .. but I digress.

[dp340]

I havnt got two and three mixed up,I can count

[Grumpy]

if the swash tilts forward the heli won't tilt back but tilts to the right?I'm going with bigpops on this one,I'll try it tomorrow.

No, the heli always moves in the direction that the swash tilts (which is what bigpops said). If you cant get it to do that then probably channel 2 and 3 needs swapping over.

[Grumpy]

I havnt got two and three mixed up,I can count

Humour me... try it.

[tomatwalden]

...,so it takes 180 degrees for the blade position to have effect?

no, 90 degrees. Watch the vid I linked to ...

[dp340]

I've swapped 2 and 3 and tried everything else to get my head round why if the swash tilts back the heli doesn't do as I expect,but now this gyroscopic precession theory and this visit makes a lot of sense,thanks guys.

[dp340]

no, 90 degrees. Watch the vid I linked to ...

Sorry to sound dumb I ment 90