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HelicopterScale Model RC Helicopters › Any tips on the setup of FBL avionics on a 5 bladed head?
06-07-2010 04:43 AM  7 years agoPost 1
jackheli

rrProfessor

Vancouver - Canada

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This my first FBL project so I was hoping I could use some lessons learned from you folks...

I understand that the avionics are used in order to correctly phase the swash, correct?

So first question: normally, on FBL avionics, is there a setup specifically for the number of blades in the head or the idea is that the software only phases the swash, so the inputs are synchronized with the radio stick, independently of what the geometry is?

Second question: I heard that for a five bladed head, in order to correctly set the phasing, one should align a blade with the boom and apply elevator input, making sure the blade does not change pitch. Once that is accomplished the phasing is correct. Does that make sense?

Third question: on the FBL software is there a configuration for taming the head to slow cyclic back to scale proportions? In that case, what should I use?

I was thinking, maybe wrongly, that since there is no real demand on the avionics, like in an aggressive 3D machine, any FBL avionics unit would do. What do you guys think?

Thx

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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06-07-2010 10:32 AM  7 years agoPost 2
Antsis

rrApprentice

Melbourne, Victoria, Australia

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I'm afraid I can only help with part of your query. 2nd question is correct, but you need to rotate the same blade through 90 degrees and do the same test with the aileron.

With regards taming the cyclic response. Not sure if you can do it with a FBL unit. I set my head up using my tx and turned the DR and expo down to 25-30%. The one I would say is make sure the cyclic/collective servos are quite torque. Align recommend 12 kgs on 6V for their 3G system. I started off using Futaba 3152's, but changed them after I saw the head oscillate in a gust of wind.

Sorry, that's about all I can offer right now.

Ant

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06-07-2010 05:08 PM  7 years agoPost 3
oldfart

rrProfessor

Vancouver, Canada

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The controls on any FBL head are direct (do not go through a mixer) so that the same amount of swashplate movement uses on a FB head will cause far more pitch change at the blade grips on an FBL head. So if you use the same settings on an FBL head, it will prove very sensitive.

So you will definitely have to reconfigure for less sensitivity.

A simple way is to extend the ball joint at the blade grips further out from center. (Like moving the control attachment point further out on an airplane's elevator or aileron control horn).

You can, of course, also dial down the servo movement, but that sacrifices resolution.

Phil

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06-07-2010 05:59 PM  7 years agoPost 4
jackheli

rrProfessor

Vancouver - Canada

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I was hoping you could dial in the sensitivity you wanted in the FBL unit itself, something like a swash AFR in the transmitter.

That is disappointing...

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06-07-2010 11:08 PM  7 years agoPost 5
oldfart

rrProfessor

Vancouver, Canada

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I am sure most of them have that. But like anything electronic, in effect it would be doing the same thins as if you would limit the ATV's on the servo throw in your TX and effectively decrease the resolution.

Much the same as when you use a long servo wheel on your rudder servo and then dial down the servo throw settings in your gyro.

Phil

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06-08-2010 04:31 PM  7 years agoPost 6
SuperSixTwo

rrVeteran

Virginia City, NV ---USA

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I just set up my SK360 for my 5 bladed head. I used the stock scale settings in the sk software. (I used this because it is super stable and i have flown it before in another heli.) My servos are 90 degree ccpm, with 10 mm between the servo center and the pitch ball. I have it set for 3 degrees negative and 8 positive. I plan to swing 600's, should be enough for the 10-12 pound heli. (the pitch numbers i just pulled out of the air, no real reason. I have more travel could change it easy to add more on the top. Negative would require a ball link adjustment, but i hope to never see it inverted hovering!)
My other sk ship has 10/11 swinging 690s with a 90 and flys awesome!

As to phasing, i didnt have to change the phasing electronicaly. I was able make the pitch links straight, and lock it down with the follower.
I might need to make 1-2 degree changes in the future. BTW, i'm using the vario swash-follower, and a lighting v2 head. I didnt see where the sk needed to know how many blades there were.

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06-08-2010 06:26 PM  7 years agoPost 7
jackheli

rrProfessor

Vancouver - Canada

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Thanks. That's what I wanted to know. Appreciated.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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