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Home✈️Aircraft🚁HelicopterBeginners Corner › Head setup help
02-21-2016 12:55 AM  4 years ago
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rrVeteran

Delaware

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Head setup help
Ok, to start i am not really a beginner but have been out for 6 years. Always flew Raptors in the past so used to a flybar head with single servo pitch. (Boy alot has changed in 6 years)

Getting started in the hobby again so after some research i went with a Trex 600 Dominator. Stuck with the Align servos and motor as well as the CC speed controlerfor now but went with a Spectrum AR7210BX receiver to go with the DX9 transmitter.

The issue I am having is trying to get 0 degrees pitch on both blades. With a level swash the closest I can get them is to within 0.6 degrees of each other. A full turn on either link throws them out by more and i know you are not supposed to go a half turn. The only solution i can think of (now that I am typing this) is to take off and thread on another link to try and get the alignment right.

I will try this as I wait on responses to this. Open to any good advice you may have and thanks in advance.
TW #1
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02-21-2016 01:09 PM  4 years ago
artimus

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Buckley WA

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1/4 a turn on each link should get it there....if not a half turn on on will work.
Turnbuckles are are another solution for micro ajustment. Almost all FBL heads today use them...easy to find the length you need.
Fly Hard......Team Viagra
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02-21-2016 03:20 PM  4 years ago
Trickycopter

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Tulsa, Oklahoma

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Make sure that all your pitch controls on radio are center I am not familiar with the DX9 as to what controls it uses beside the sticks as I fly Futaba. But I have seen this mistake made many times.Synergy E7 AMA member Team Old Farts citizen 401 www.trickycopterrc.blogspot.com
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02-22-2016 01:43 AM  4 years ago
Heli_Splatter

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USA

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You seem to be describing an old head type without the turnbuckles. You are going to have to do the best you can. Are you measuring with a digital pitch gauge? I would get them as close to each other as possible, and then adjust to the zero point with sub trim on the three swash servos.

I always try to get the helicopter as perfect mechanically before I add radio adjustments. Any chance that one or both blades are warped?
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02-22-2016 03:26 AM  4 years ago
rcflyerheli

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Granbury, TX USA

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Do you have a prop balancer? If you are measuring your mid stick pitch with a digital pitch gauge, use the prop balancer rod and cones. Put the rod through the bolt holes in each grip and slide the cones up until they are snug and can't move.

With the swash at center and level, simply sight down the rod and see if it is parallel to the main shaft. If it is not parallel, adjust the link to get it parallel. I've been using this method for 5 years now, and I have not ever had a heli with a tracking problem.

This photo is one I took to demo the idea. I switched over to the rod and cone method after I took the photo.

Hope this helps
Logo 700, Specter 700, Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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02-23-2016 01:11 AM  4 years ago
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rrVeteran

Delaware

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All good advice. It is a brand new kit with the DFC head with no turnbuckles. I am using a digital pitch gauge.
With the throttle stick centered (on the monitor screen) and no abnormal settings (no mixes, sub trims or anything else. Just a brand new model) I have all the servos set at 90 degrees to the links and the swash level. It is also level at the top and bottom of the throws.

I am bolting the gauge right to the blade grip. I can get one blade grip at 0.0 but the other grip is -0.6, the links are directional (they only go on the ball in one direction) so you have to make a full turn on the link. If I go a full turn it brings the second blade to 0.7

Not sure about using any sub trims as this would effect both blades evenly, throw the swash out of level and the AR7210 may see this as an input command and that could get ugly.

Turns out i could not even switch out links and hope i got the threads closer the second time as I have no spare links that fit that size rod. Only helicopter i have ever seen with an oddball size linkage rod.

I will try the balance rod trick to see what it looks like.
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02-24-2016 09:54 PM  4 years ago
Heli_Splatter

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USA

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When you measure the blade pitch, do you measure on the same side of the helicopter?
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02-25-2016 12:02 AM  4 years ago
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rrVeteran

Delaware

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Yes, I put the blades parralell to the tail boom and measure facing the front, then rotate the head 180 and measure the other blade.

Using the balance rod shows they are off. Going to order some of the oddball size links so I can try again.

Half a turn would do it.
Does anyone know what happens when you put the link on with the "A" facing in? Seem to remember reading that they are designed to pop off easier in a crash as a way to try to save the servos. If that is the only reason for the links being directional i can take my chances to maiden this thing so I can finnish the setup while I wait on the new links.
TW #1
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02-25-2016 12:08 AM  4 years ago
Trickycopter

rrApprentice

Tulsa, Oklahoma

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Not sure you can turn them around one side is smaller than the other might fit to tight. You want them snug but able to move on the ball with servo inputs.Synergy E7 AMA member Team Old Farts citizen 401 www.trickycopterrc.blogspot.com
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02-25-2016 12:35 AM  4 years ago
ICUR1-2

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Ottawa, Ontario

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it's a dfc head? don't they use turnbuckles?

if you pop the links on backwards it may pop off with wear.
spending time, paying attention
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02-25-2016 12:56 AM  4 years ago
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rrVeteran

Delaware

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Yes, it is a DFC head and at this point I wish they had turnbuckles. I would have had this set up finished easily and without this post TW #1
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02-25-2016 03:14 AM  4 years ago
rcflyerheli

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Granbury, TX USA

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I don't know if this will help, but Rocket City makes links that will fit either way. I havent tried them on anything but a Trex 500, but they work fine on it. The links are physically longer than the Align links, and you will probably have to drill out the center of the link to fit the DFC but since those DFC threads are so short, maybe it will work.

FWIW, I've set up 4 of the DFC helis and didn't have any issues getting the blades to line up at mid stick. Don't know why you are having such an issue. Are the little turnbuckle like threads screwed all the way into the aluminum DFC housing?
Logo 700, Specter 700, Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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02-25-2016 10:47 PM  4 years ago
Heli_Splatter

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USA

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A picture of the head would help... I am a bit confused.
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02-26-2016 03:01 AM  4 years ago
artimus

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Buckley WA

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You could always pop a ball off the swash turn your link half a turn pop the ball in the link from the proper side and screw the ball back in to the swash after a dab of loctite and your good to go.Fly Hard......Team Viagra
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02-26-2016 10:09 AM  4 years ago
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rrVeteran

Delaware

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Way to think outside the box artimus. May have to try that, when I get the time, I will also post a picture. Busy weekend comming upTW #1
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