Pitch problem +11/ -10

[xdreamx]

Today I replace my main shaft, and put back together i also use The Swash Level to make it balance from servo arm link to swashplate all perfect, then put the head in. Start checking the pitch from stick 50% and 0 pitch were fine, than do the full stick with +11 pitch kinda off so i when into my Dx7 go to swash mix then go to pit adjust now +11 pit were fine even paddle, Than i do -11 but it was off, it show -10 I don't know what to do now? help me

[briangp]

Travel adjustment a little off in the TX?

[xdreamx]

braingp i don't get what you mean?

[briangp]

What values did you change to/from in your swash mix?

[xdreamx]

swash mix pit is from stander dx7 +60 to +45 now. i use swash level to balance all 3arm and servos 90degree

[supra6]

So you have to much total pitch range, ie 21 degrees, swash mix will cure that, dial in less pitch on the mix.
Pitch being uneven from + to - has to do with the height of the swash at the mid piont (50%) collective. If you are using the stock head you'll need to shorten the control rods 1/2 turn, all 3 done the same to maintain a level swash. Now you'll have to reset the pitch at the 50% point to 0 and check you extremes.
End points or travel adjustment are used to prevent interaction, which is seen as the swash not being level at the extremes +10 an -10.

[xdreamx]

I got this beam a month and when i change the main shaft prblem started. I already did shorten 3 arm rod at the begin and use the 450 swash level tool. i also mess two long link rod was that the reason? also mess with the shortest link rod for tracking. I want to get +11 & -11 but now i got is +11, 0 , -10

[supra6]

Your close
The mid-stick (50%) collective should give you 0 pitch, no problem there.
The swash needs to move the same amout, travel, both up and down to yeild the same amount of pitch + and - . So if you have +11 and -10, and you want +/-11 you'll need to first lower the mid point of the swash buy shortening teh servo to swash links.
At this point you are looking to get equal (+11/-11) pitch on the blades, dont worry what the actual value is just reset the pitch to 0 at mid stick and see if + and - are equal, this means you now have the swash at the neutral point height.
Next you'll need to adjust the swash mix pitch value to increase the total pitch range available. If after doing the above steps with the servo to swash links and you have +10/-10 you just need to increase the pitch value in the swash mix to get the +11/-11 you want.

Servo to swash links control the swash height and levelness
Swash Mix pitch controls the total amount the servos will move in the PITCH range, think of it as an end point adjustment to increase or decrease the servo throw, HOWEVER this dose it to ALL 3 servos at the same time. Servo end point adjust just one servo at a time.

[supra6]

One other thing to keep in mind, TRACKING.
Designate one blades as the master and have that set to the numbers you want, set the other blade to match as close as possible but when it comes to tracking inflight just change the slave blade. this slave blade may not measure the same pitch (exactly) as the master but they are tracked correctly.
Also it is very hard to get accurate measurements on a pitch gauge, it depends on how you look at it, is the flybar locked and how tired are your eyes, so a bit ov varriance is going to be there, the proof is in the flight.

[xdreamx]

could you give me your measure of the 3 link rod arm servo from the swash plate and the two Longest rod which called seesaw mix. and 2 little rod from the blade

[briangp]

Mine are all the length as prescribed in the manual.

Servo to swash: ~38.7mm

Swash to seesaw: ~46.3mm

Granted they aren't perfect measurements, I'm using a ruler and not a caliper but it produced a perfect hover on the initial flight. I haven't checked pitch amounts though, I don't have a pitch guage and I'm not experienced enough to care about 11 degrees of pitch. Any variances I had I cleaned up with a little sub trim. Remember to sand the ends of the link ends because theres a little nubbin from the mold on there that can put your measurements off.

[xdreamx]

i reset all my arm, when i put the left&right stick up and the right stick up to right i hear buzzing was that okie buzz or need to fix it ?

[briangp]

Sounds like your binding. Are all your swash settings at +/- 60?

[xdreamx]

Ale -60, Elev +60, pit +60
i try and try, i even did eye balling to make even from bottom to top. i could do not do it man still the same solution, +11, -8 now omg takes 8hours now still could not figure out i feel really dumb =(

[briangp]

Reset your transmitter settings and start from scratch (or start a new model?)

[xdreamx]

I suck at setting up ccpm.
Okie I re-measure orginal from the beam base on manual. main blade holder rod (25mm), washout arm rod (29.2mm) (flybar control arm), seesaw mixing arm (46.3mm), swashplate arm rod (38.7mm).

Than I use the swash level tool to level the swashplate arm by go to Dx7 (sub trim) adjust get them level. Now my throttle stick at 88 equal 0 pitch gauge, aren't that have to be at stick 50 = 0 pitch gauge? so how i fix that?

[briangp]

I'm not the greatest at setting up CCPM either, but once you get the hang of it, its kinda like riding a bicycle, or so it seems. It sounds like your swash settings are not high enough, or maybe you forgot to zeroize all your sub trims.

Make sure your swash settings match those according to the manual. Thats where I started and the rest was nothing more than a little trim.

Did you start from scratch?

[supra6]

Ok yoour getting further out!
As far as the control rod lengths for the servo to swash there was an amendment to the directions I had with different lengths listed, don't have the info infront of me but check the Finless video of the Beam build for the info.

Subtrim is used to get the servo arm 90 degrees to the case.

At midstick (50% collective) you should have 0 pitch and the wash-out arms level, remember level actuall means 90 degrees to the main shaft, the Beam has a slight forward slope down in the frame so if you are using a bubble level you'll be off.

Again set your swash mix pitch value to 65 and see if you have equal pitch both + and -, don't worry so much about the value just get it even buy adjusting the height (distance above the frame) up or down using the servo to swash control rods. When it's even recheck the washout arms level using the washout to pivot control links and recheck you pitch to 0 (midstick, this will have changed after you move the swash up or down) adjust with the rods from the piviot to the grips.

Now you should have equal pitch up an d down and 0 pitch at mid stick (don't worry about the amount make sure it's equal) check the amount of pitch and increase or decrease your swash-mix pitch value to obtain the desires amount.

Just to make sure , you are doing all this in idel-up mode, meaning you have a linear pitch curve from 0-100 set on the transmitter?
Also when setting up the head start from the bottom and work your way up.
Anf lastly when leveling the swash make sure to check the levelness at the limits, if it's not level at the extremes of travel use travel adjust (end-point) adjustments to get it level.

[xdreamx]

Originally Posted by briangp

I'm not the greatest at setting up CCPM either, but once you get the hang of it, its kinda like riding a bicycle, or so it seems. It sounds like your swash settings are not high enough, or maybe you forgot to zeroize all your sub trims.

Make sure your swash settings match those according to the manual. Thats where I started and the rest was nothing more than a little trim.

Did you start from scratch?

all sub trim was zero, after re-measure I use sub trim to lvl the arm from a swash lvl tool

[xdreamx]

supr6! so i go to the swash mix set to +65 but this will cause my pit servo buzz, then use the pitch gauge to see if it +/- equal out, what if its not even?