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HomeRC & PowerAircraftHelicopterFlybarless Rotor Head SystemsOther › Phasing and the V-Bar
02-03-2010 03:22 AM  8 years agoPost 1
dahld

rrKey Veteran

Bakersfield, CA, USA

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There is another thread in progress on this issue, but I don't want to "thread knap", as the other thread is about the Align FBL. This thread addresses the same issue, but describes how the V-Bar handles the situation.

From my experience it is important to get the sensor mounted square with the frames (as much as possible), and the swash plate driver adjusted properly so the control rods from the swash to the blade grips are parallel with the main shaft (as much as possible).

But even if you get all that as close as you can, you may still discover (for whatever reason), that some phasing still exists.

Enter the V-Bar's programming. Rather than fight with the mechanical issues at that point, there is a function in step 4 of the "set-up" page, that allows you to "electronically" adjust the swash plate phasing. In "virtually reality", it allows you to rotate the swash plate in either direction, as much or as little as you want, to eliminate any interaction should you have some.

Pretty sweet function (-:

Dave

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02-03-2010 06:03 AM  8 years agoPost 2
Justin Stuart (RIP)

rrMaster

Plano, Texas

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I've never done this, but I think your are right. See, I though you could adjust the phasing so much that you could actually mount the sensor 90 degrees to how it is supposed to be, but MrMel says that the sensors for elevator and aileron are different and so it wouldn't work.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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02-03-2010 06:43 AM  8 years agoPost 3
Stet

rrElite Veteran

Key Largo FL

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We will be phasing one to accommodate the 45 degree offset swash system on a really nice (now antique) Robbe Millenium 2. I think it will be pretty neat.

If anyone has any comments about using Vbar on traditional mixing (not ccpm) please send me a pm.

keepin' it real

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02-03-2010 07:19 AM  8 years agoPost 4
MrMel

rrProfessor

Gotland

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Justin;
Sensor mounting is BEFORE the control loop.
VBar Phasing setting/turn swash is AFTER the control loop.

So using "turn swash" to set phasing because of a mis-aligned sensor isn't really a good thing.

Just think of it logically, "sorry, Mr Spock Mel speaking",
Sensor alignment causes interaction, so in a pure elevator movement you get interaction on aileron axis, and since the control loop is different for those on the VBar, running the aileron control loop for elevator stuff isn't good.


Phasing issues in general;

I made a simple video in Phoenix last week to simulate bad phasing issue in both direction, and how to spot it.

Watch at YouTube

As you can see easiest way to spot it is that tail goes out of line on a half flip, but to come back on the second half.

Your best friend when mounting a sensor to get it straight? My 2 1/2 year's son's Lego box, I build lego pieces to make "a something" that I can use as 90 degree check.

It can be a single piece of lego (on my Logos) just to put between frame and sensor, or it can be a fork looking piece that has a arm that aligns with the frame on the outside, anything is possible.

Stet;
Yes, turning the swash for 45 degree mixing is just what this function is for also.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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