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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Sub-trim on tail servo
12-27-2010 03:20 PM  7 years agoPost 41
fenderstrat

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Aston,Pa

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Michael.I think you and I are trying to say the same thing 2 different ways.

yes you will have to do final set up and adjust the end points,but that is the MECHANICAL set up.subtrim should not cause the gyro to move the endpoints.I dont think I am explaining what I am trying to say properly

to Supercool heli...once the subtrim is dialed in you have to do your final mechanical set up

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12-27-2010 03:34 PM  7 years agoPost 42
Supercoolheli

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Dallas, TX

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anyone?

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12-27-2010 03:51 PM  7 years agoPost 43
Supercoolheli

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Dallas, TX

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here's what i'm seeing right now:

^image of tail pitch slider when servo arm is at 90 degrees

^image of servo arm when tail pitch slider is in center of output shaft.

---as you can easily see, it's a tradeoff for which i want centered and i'm not sure whether i need to pick one, or how i get them both centered?

Sorry for the dark pictures

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12-27-2010 04:19 PM  7 years agoPost 44
fenderstrat

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Aston,Pa

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you set your servo arm at 90,center the pitch slider,then adjust the tail linkage so it fits

unless you are doing a rate mode set up,then you adjust so it holds in a hover with no yawing

what does your gyro recommend?

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12-27-2010 04:27 PM  7 years agoPost 45
DS 8717

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And always setup your gyros in rate mode in a hover . You will always get the most out of it .
Solid G doesnt have a rate mode...........

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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12-27-2010 04:57 PM  7 years agoPost 46
Supercoolheli

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Dallas, TX

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i'm using a Total-G, not a Solid-G haha but it still has no rate mode

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12-27-2010 04:58 PM  7 years agoPost 47
Supercoolheli

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Dallas, TX

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fenderstrat, i completely agree with you but that's exactly the problem. It is impossible for me to center the arm on the servo to where the pitch slider is centered in the shaft. I figure the only way to do this is by linkages so i'll look into that unless someone can reccomened something else

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12-27-2010 05:44 PM  7 years agoPost 48
THX1138

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Indianapolis, IN

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This is what you want right here...

http://www.horizonhobby.com/Product...?ProdID=JRPA216

There are several holes in the wheel. Find the hole that is the closest to 17mm, there should be 8 pre-drill on the wheel. One of the 8 will lineup at 90deg. That should fix your issue.

Lou

Just give me five dudes and two flashbangs...

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12-27-2010 05:56 PM  7 years agoPost 49
Supercoolheli

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Dallas, TX

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i already have some of those. I'll try them again to see if any line up like i need. thanks

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12-27-2010 06:19 PM  7 years agoPost 50
mlucia

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Essex Jct., Vermont

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Supercool (Eric)...

You are making this much more difficult then it needs to be.

Think about it logically. You want to make the tail servo centered so that you have equal amounts of throw from center left and right. Even if the servo is angled think about how you will achieve this.

Personally I would not use subtrim on the rudder. As already mentioned, get a horn that you can make 90 if the ones supplied do not.

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12-27-2010 06:41 PM  7 years agoPost 51
Supercoolheli

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Dallas, TX

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Well if i did that i have no idea which i'd get...the straight arm (one said to use in the manual and the one that Curtis uses) which has the 17.5mm out from center than i need, then there's also the big wheel arm, which only gives me about 13mm out from center, which Curtis said not to use. I know this is obviously an easy thing but i'm sooo confused

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12-27-2010 08:08 PM  7 years agoPost 52
fenderstrat

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Aston,Pa

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seriously,at this point you are making this WAY more difficult than it needs to be.

disconnect your tail servo linkages,servo arm at 90,tail slider centered.now adjust the pushrods accordingly,you are done the mechanical set up(still need gyro set up).I am not trying to be a smart a$$, but this should take about 5-10 min

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12-27-2010 09:01 PM  7 years agoPost 53
Hamo

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Ireland

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Trim and sub trim do the same thing. They both increase or decrease the width of the pulses to the servo. The main difference is that sub trim applies to all flight modes whereas trim can be different for each flight mode. So if you can't get the servo horn exactly at 90 degrees, you would use a little sub trim because this would be valid for all flight modes. After that you don't touch trim.
When the gyro initializes, it memorizes the pulse width it receives from the rudder channel as being center stick.
Hamo

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12-27-2010 09:09 PM  7 years agoPost 54
GotyaNick6100

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Hollister,CA-USA

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The best fix is simply to manually adjust the length a couple turns in or out and not the sub trim! the gyro gain is response only! test and adjust till the tale behaves properly... GL

GotyaNick

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12-27-2010 09:24 PM  7 years agoPost 55
fenderstrat

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Aston,Pa

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Trim and sub trim do the same thing
trim adjusts a control channel,such as aeileron or rudder.In the case of elevator a trim adjustment affects all 3 cyclic servos at the same time

subtrim adjusts the centerpoint of an individual servo

how is this the same thing?

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12-27-2010 10:01 PM  7 years agoPost 56
Supercoolheli

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Dallas, TX

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ok i think i know what to do now guys. I'm gonna look through all my servo arms (only have like 2 or 3) and find the one that gets me closest to 90 degrees, then i'll hone it in with sub-trim. Then i'll use the front control rod to make the bell crank 90 degrees, then i'll use the rear control rod to make the pitch slider 90 degrees. Hopefully that works . i'll let ya guys know

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12-27-2010 10:27 PM  7 years agoPost 57
fenderstrat

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Aston,Pa

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12-28-2010 12:30 AM  7 years agoPost 58
ssmith512

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Indianapolis, IN USA

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i'm using a Total-G, not a Solid-G haha but it still has no rate mode
The Total G does have a Rate Mode. It is accessed in the Tail Gyro "Advanced" screen. I do not think it "switchable on-off" during flight though - only through setup.

Steve

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12-28-2010 12:32 AM  7 years agoPost 59
ssmith512

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Indianapolis, IN USA

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ok i think i know what to do now guys. I'm gonna look through all my servo arms (only have like 2 or 3) and find the one that gets me closest to 90 degrees, then i'll hone it in with sub-trim. Then i'll use the front control rod to make the bell crank 90 degrees, then i'll use the rear control rod to make the pitch slider 90 degrees. Hopefully that works
Exactly!!

Steve

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12-28-2010 02:40 AM  7 years agoPost 60
Supercoolheli

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Dallas, TX

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great, thanks! I'll try to get all that done tomorrow when my dad can help me and i'll let you know how it goes . Just looking at it now, when i get the servo arm at 90 with subtrim (about 27 subtrim), the bellcrank is in fact straight, so it's just the rear control rod needs to be tightened (that is if i'm using 0 pitch in the tail blades). Still confused as to if i need the 5 or so degrees like i thought, or 0 degrees as i've heard of other people doing. I had thought i was running it with the small pitch amount but then i realized that this might be what was causing my drifting and that i needed 0 pitch for a still tail...

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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Sub-trim on tail servo
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