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HomeAircraftHelicopterMain Discussion › Swash mixes, ATVs, CCPMe, Binding, Radio settings & stuff I should already know
06-02-2009 12:55 PM  9 years agoPost 1
Frank Bostwick

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Cincinnati Ohio

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You can say what you want about my Century Hawk and its mechanical mixing system, but man is it simple to set up......Ive been lucky or not depending on your POV and not had to get too deep into binding issues and the set up ins and outs of CCPMe. That "luck" has changed and now I can no longer avoid the learning curve.
My heli is kind of unrelated to the point here but Ill list it as I know its in the need to know category.
Century Raven, metal head, 3x9252, DX7. It has some binding issues in the extreme corners that I am working thru.
But thats not my point (question).
Working thru this Ive come across some basic questions that honestly I should already know.
On my sub trim I need, Alie 23, Pit 18, Elev 0. To me the 23 is a bit higher than Id like but its the best servo arm match I have. So that brings me to basic question 1

When you add sub trim, the center position as indicated on the servo position screen (DX7), changes. So whats center stick? If I use the center indicator for PIT, my servo arm will be at 90 but the stick and all other servos that dont have sub trim of 18 will not be at center. If I use a servo that has NO sub trim to "center" (as indicated) The set up for all sub trimmed servos will be effected.
Center of throw will be different for any servo not at zero sub trim.
Again, so whats center stick?

Ill add some more questions here soon. I guess the point of this thread is to get a better understanding of the many interactions that happen with a CCPMe set up. Ive watched many vids and read a bit, Im not overly thick, so if I have questions like this so do many others.

So the point here is an in depth discussion for a better understanding of CCPMe, quickly becoming the only system, its set ups, interactions and how to best utilise the different parameters available. (swash mix, atvs, sub trim, mixes etc.)
Clear as mud?

RIP ROMAN

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06-02-2009 01:35 PM  9 years agoPost 2
mlucia

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Essex Jct., Vermont

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Best case scenario you would not have any subtrim but.....sometimes you just have to. Is 23 a little much? That may be a debate in itself.
Personally if that's the best way to get 90 on the arm then so be it.

With a linear pitch curve (0,25,50,75,100) center stick is always that, center. Looking on the pitch screen it should show 50 in and 50 out at center stick.(during setup you can flat line the pitch curve to 50,50,50,50,50 to avoid moving from center). Subtrim or not that is always center for setup (0 degrees pitch).
This of course assumes the rod lengths are correct and everything is 90 from the servos up to the head.

As for interaction, you may find this thread interesting:
http://runryder.com/t393015p1/?high...sh+expo+on+9303

ATV/EPA = 100 (ail, ele, pitch). Then use swash mix to control/set overall cyclic/pitch range.

then

ATV/EPA: Used for high and low stick adjustments for interaction (typically only a few clicks needed)

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06-02-2009 01:37 PM  9 years agoPost 3
Jonty

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Wellywood

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Sorry I may be being a bit stupid but I am not quite certain what your question is. Apologies if you have already worked this out but remember with CCPM the "pitch" subtrim settings are for the single pitch servo alone so you use subtrim to center the single servo as you would with mechnical mixing (this should not effect the other two servos). You only change all 3 servos together when you are changing the travel and direction in the "pitch" setting in your ccpm setup (ie moving between + and - 60).

Sorry if I have missed the point.

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06-02-2009 02:40 PM  9 years agoPost 4
Darren Lee

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Woodstock, GA

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When you add sub trim, the center position as indicated on the servo position screen (DX7), changes. So whats center stick?
I have also noticed this and simply ignore the servo position screen as a result. Like metioned above, just reference one of the pitch curve screens instead and set to 50 in, 50 out.

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06-02-2009 03:04 PM  9 years agoPost 5
cbflys

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Nesconset, NY - USA

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Ultimately, your sub-trim, stick position, trim, expo, mixing, etc. gets crunched up by the computer to determine an output pulse width. It's this pulse width that is being graphically presented on the servo monitor screen.

When you use sub-trim to center a servo, all other compensation mixing and trims work as usual and the resulting position is offset by your sub-trim setting. The thing you need to be careful about when using large amounts of sub-trim is the possibility of running your servo to its mechanical limit.

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06-02-2009 05:42 PM  9 years agoPost 6
Frank Bostwick

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Cincinnati Ohio

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Those are all great responses and a good thread to follow, thanks.
Cbflys brings up a good segway to the next question. Again I should know this but my other heli does not have this problem so I have been lucky.
Question 2
Now the head is in a good basic set up with minimal interaction. BUT, always a but, when the sticks are in the corners, some or alot of mechanical binding occurs. Flybar cage or arm contacting blade grips and or other moving parts of the upper head.......
Putting the sticks in the corner and moving the flybar thru its 360deg arch shows this.
Corrective action? Minding sometimes multiple options seem to be available meaning, as an example the fly bar is hitting the grips, I could ATV the Alie servo OR change the swash mix. Which is better and or what are the interactions between the two...

RIP ROMAN

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06-02-2009 06:53 PM  9 years agoPost 7
cbflys

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Nesconset, NY - USA

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The problem you are experiencing is due to the tx sticks allowing you to overdrive your cyclic. This is the very problem cyclic rings (mechanical or electronic) solve.

Unless you use a ring, you can either dial out aileron/elevator throw using the swash function (eCCPM) or with the endpoints (mechanical mixing) or mentally remember not move the cyclic into the extreme corners.

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