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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsBrain iKon › Zero pitch mechanical setup.
07-07-2017 07:15 PM  33 months ago
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Raptor Freak

rrApprentice

Auburn, Wa

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Zero pitch mechanical setup.
Im on the servo setup for 90deg on my servo horns but cannot get zero pitch at mid stick. All my links are turned in as far as they will go and can only get to about 4 to 5 degs not zero. Am i missing something?? Trex 700e dfc.
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07-07-2017 09:23 PM  33 months ago
Flyin for Jesus

rrVeteran

Troy, IL. 62294

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I've had this issue and had to cut down links... also had to order new links once.

Shoot a pic and post it... maybe we'll something that you don't.
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07-08-2017 01:35 AM  33 months ago
ticedoff8

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Morgan Hill, CA. USA

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I assume this is a Trex 700E Pro DFC?

Check that the DFC arms are screwed all the way in (shortest) and then make sure your servo swash links are the correct length (check the 700E build manual):
http://www.align.com.tw/manuals-en/

But, if it is a different version of the 700E, does your 700E have the A-arm bellcrank for one servo?
Or, do all 3 swash servos have direct links to the swash?

I ran into problems like this with a Trex 600E that has two servos with direct links to the swash and the 3rd servo connected to the A-arm that moves the swash and acts as the swash anti-rotation guide.

The problem I had was that my A-arm was not adjusted to its true "center" per the way Align designed it.
It was centered based on what I though it should be.

And, it made it tough to to 0 the blade angle.
+ > ÷
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07-12-2017 03:58 AM  33 months ago
Raptor Freak

rrApprentice

Auburn, Wa

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Got it figured out. Thanks.
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07-12-2017 07:46 PM  33 months ago
JuanRodriguez

rrProfessor

The Villages, Florida

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💎Sustaining Member
Why not post what you "figured out" so that others may benefit???Been there, done that and old enough to know better.....
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07-14-2017 03:31 AM  33 months ago
Raptor Freak

rrApprentice

Auburn, Wa

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All i did was drop the servo arms down a bit. Thay are not at 90degs but i still get 0 deg pitch at mid stick. and still have enough servo movement no binding to get up to 14 degs pos and neg. probably wrong, but hey it works.
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07-14-2017 09:57 PM  33 months ago
rcflyerheli

rrKey Veteran

Granbury, TX USA

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As has been suggested, can you not put them at 90, and shorten the links from the servo arm balls to the swash balls.

Your issue is mechanical setup, and there are so many 700s out there, without issues. By not having the arms at 90, you will get some odd flight interactions between cyclic and pos/neg collective.
Logo 700, Specter 700, Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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