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HomeAircraftHelicopterAlignT-REX 600N › A couple of questions...
01-29-2016 02:24 PM  29 months agoPost 21
Pistol Pete

rrProfessor

Seffner, FL

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Yes, it is possible to have more pitch one way than the other dependent of how much subtrim you had to use to center the servo horns at 90 degrees. Whatever amount you use to subtrim one way is taken away from the other as you shifted the neutral position.

As long as you are able to get the degrees of pitch that you want, the excess pitch can be adjusted down via servo travel endpoints.

~~Enjoying the hobby one flight at a time~~

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01-29-2016 06:53 PM  29 months agoPost 22
no1gsxrman

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Baltimore, Md

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This is one reason for programable servos. One way to get it closer is to try to use servo horns that get you closer to center without allot of sub trim.

Put the woman and children to bed it's time to go fly!

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01-29-2016 06:54 PM  29 months agoPost 23
no1gsxrman

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Baltimore, Md

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The more sub trim the less travel you have for the servo in the opposite direction.

Put the woman and children to bed it's time to go fly!

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01-29-2016 08:07 PM  29 months agoPost 24
AaronBmore

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baltimore,md, usa

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so I have spent some time looking at how to "set" the pitch levers at mid stick. so far on my Trex 600N V2 this is what I've been doing. I think its wrong and may need to be slightly lower because at max positive stick I have the severos mashing the mixing block up against the bottom of the head.

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01-29-2016 11:28 PM  29 months agoPost 25
no1gsxrman

rrNovice

Baltimore, Md

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Thats fine. It is the three rods going to the swash that are going to make the difference. I would be more than happy to help you out.

Put the woman and children to bed it's time to go fly!

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02-03-2016 11:26 PM  28 months agoPost 26
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

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That is exactly how you set the center points for the servos / bellcranks.

Now that the 3 servo's centers are set, do not ever touch that adjustment again

The hinge point of the A-arm becomes your reference height for the swash. That A-Arm is non-adjustable.

When you level the swash, adjust the two rear bellcrank to swash links. Resist the temptation to mess with servo centering to level the swash.

The swash should stay level from full bottom to full top.
If it isn't, you can adjust each servo's top travel volume or bottom travel volume - this does not affect the servo's center.

When you adjust your maximum +/- pitch (using collective mix), you will find the swash is only moving about +/- 10mm. So, it won't be smashing into the frame or the head block.

Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!

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02-04-2016 04:35 AM  28 months agoPost 27
AaronBmore

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baltimore,md, usa

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Thank you ticedoff, I think that was my problem. I was looking at the lever that the a-arm was attached to thru the round window in the frame. I should have been looking at where the two rods connect, next to the main shaft and hard to see. But i set that arm plumb with the main shaft and i think i have gotten better results. The problem is that when the elevator lever is level thru the window it is infact too high causing interference at full positive.
Wish something explained this. Positioning isn't really mentioned in the manual, and hard to find quickly online

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02-06-2016 12:29 AM  28 months agoPost 28
AaronBmore

rrNovice

baltimore,md, usa

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New level of frustration.
So i just got the leveling tool. Leveled the swash. Played with each servos endpoints to make full positive and full negative level swash.

Then checked the pitch. I cant get symmetrical positive and negative. Getting 12 pos and 10 degrees, so i figure fine whatev. Then I check pitch for cyclic. For ails getting +8 -7. Same for ele

So if i change endpoints to get even pitch for ele and ails, it messes up swash being level thru collective.

I keep chasing symmetry and im about ready to throw something.

wtf wtf. Someone please help.

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02-07-2016 11:53 PM  28 months agoPost 29
dkshema

rrMaster

Cedar Rapids, IA

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You have a CCPM swashplate. Quit messing with servo travel endpoints.

The ONLY time you touch the servo travel endpoints is AFTER you have gotten the swash leveled at ZERO degrees pitch.

Go to full positive collective. The swash should remain level. If it doesn't, then adjust the endpoint of the servo that moved too far, to get the swashplate level again.

Go to full negative collective. Adjust the travel endpoint ONLY of the servo that moved too far, again to get the swash level at full negative.

Travel endpoints are ONLY used to level the swash at its full + and - limit, nothing else.

Overall pitch travel is set in the SWASH MIX menu, by changing the PITCH number. Larger means more overall travel, smaller means less overall travel.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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02-08-2016 03:08 AM  28 months agoPost 30
no1gsxrman

rrNovice

Baltimore, Md

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If you are still having trouble send me a pm. and we can meet up.

Put the woman and children to bed it's time to go fly!

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HomeAircraftHelicopterAlignT-REX 600N › A couple of questions...
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