V bar Collective range on logo 600

[Jez N]

New to the V-bar setup, so sorry if this is just a silly question.

@ 16mm servo hole (as suggested in the instructions) i only get +9 and -11 collective. To achieve the full +/-12-14 presumably i just increase the servo hole length to 20mm+ to achieve the greater collective whilst keeping the slider in the 80-100 band?

[Ludal77]

What servo did you put on cyclic ?

[Jez N]

Futaba S9252 on the cyclic

[Ludal77]

Did you buy the Mikado dedicated servo arms ?

[Jez N]

They are the same as the ones in the instructions with holes at 14, 17 and 20mm.

why?

[Downdraft]

A couple of things that you should be aware of I think.

Firstly the futaba 9252 only has just over 6kg of torque which in my opinion is barely enough for a 600+ size FBL machine, and secondly it's recomended to be run at 4.8 volts only so I'm not sure you can run it on a Jive ESC BEC.

When you compare the Futaba to a humble Align 610 the specs of the Align way out do the Futaba, the Align has 12kg of torque. If I were you I would seriously have a rethink on wether or not I was going to use servos with such low torque output on a large flybarless machine.

[Ludal77]

Because some mates are using MKS arms and they can't reach the specifications of the BeastX when tweaking their Logo's. I guess it's the same with some Futaba servos. I've never had a problem to set up my Logos on Align DS610 with their original arms. I had to put the ball links in the very last hole. Try to do the same, if it doesn't work, buy Mikado arms for Futaba servo's.
Your servo's are a bit too weak for FBL requirements, but you can train with them. Do not try to shake your bird with such low torque

[rachel]

New to the V-bar setup, so sorry if this is just a silly question.

@ 16mm servo hole (as suggested in the instructions) i only get +9 and -11 collective. To achieve the full +/-12-14 presumably i just increase the servo hole length to 20mm+ to achieve the greater collective whilst keeping the slider in the 80-100 band?

No keep the servo arm length the same as recommended just lift the collective slider in the v bar set up , you should be able to get the required amount of collective range that way .

It's not esential to have the sliders in the green .


Also your collective range isn't equal so make sure you have got zero degrees at the swash set up stage .

At first v bar does seem impossible to work out as do all fbl units. But it's just a case of the more you use it the easier it sets :-)

Good luck x rach

[Jez N]

Thanks all

I guess i will look into replacing the servos and see what collective range i get.

[Mark_T]

... and secondly it's recomended to be run at 4.8 volts only so I'm not sure you can run it on a Jive ESC BEC.

Keep beating this one to death but it won't stay down

4.8V servo rating does not mean 4.8V, it means 4 cell NiCad pack. The default voltage for a Jive BEC is 5.6V which is well inside the range for a 4 cell pack so that need not be a concern.

[LaurenceGough]

+1 on what Rachel said. I'm using the Mikado carbon arms and the recommended holes, I just fly to the pitch I like, I found that this was 104 on the V-Bar set-up with 623mm main blades. Above the recommended max but no probs with doing so, also I've ran 108 for a very long time which is a big difference in feel from 100 in V-Bar. It's essential that you check the pitch when in the set-up mode, and that you have equal on both sides. If you measure pitch outside of the set-up mode you will have to deal with the gyro's feedback effecting servos.