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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Sub-trim on tail servo
12-27-2010 02:16 PM  7 years agoPost 21
fenderstrat

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Aston,Pa

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Subtrim nothing ! Set up subtrim in your mechanical setup . Shorthen your long tail push rod or lenghten it . No subtrim
this sounds great, but does nothing for the original problem,you still want to get the servo arm /wheel at 90 deg.

there are 2 ways to do this,subtrim or as said drill a wheel for your specific heli
If the only downside to subtrim is losing a little bit of servo throw, i wouldn't mind in the slightest
most servos have more travel than we need for the tail,which is why gyros have an endpoint adj.so you should be fine.

there was a post on here a while back which had an article from CSM gyros about how a little offset on the tail servo actually helps even out the differences in tail throw when you do a rate mode set up,but I think the vast majority of flyers just go with a 90 deg set up

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12-27-2010 02:20 PM  7 years agoPost 22
Supercoolheli

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Dallas, TX

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ok here are some pictures that i just took DIRECTLY from the manual that prove that, at least on my helicopter, i need to center servo vertical TO THE FRAMES, and NOT to the servo case: Hopefully some of these can better explain what i need?

BTW, that third picture with the servo arm (came with the JR 8900) shows the exact 17.5mm out that is required for the heli. I am using this arm, with that same placement, with no change in results yet.

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12-27-2010 02:22 PM  7 years agoPost 23
Hellsiege

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Colorado Springs, CO

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Yours must be different

I would go as manual says and use wheel. Once servo is centered and wheel is on - then drill just like in pic at same distance from center so you can mimic what they have.

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12-27-2010 02:23 PM  7 years agoPost 24
Supercoolheli

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i guess i'd be willing to try it 90 to servo casing but the manual specifically says otherwise so i find it worthless...

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12-27-2010 02:35 PM  7 years agoPost 25
fenderstrat

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Aston,Pa

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I just downloaded the manual for your heli.So set the servo arm/wheel 90 to the frame or ground actually from what the picture shows.Your set up looks to be pointing straight up relative to the ground.make the arm at 90 deg to the tail pushrod ,do final set up and go fly

the servo in the Rave is not mounted horizontal or vertical,but at an angle,so using the servo case is not the way to go here

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12-27-2010 02:40 PM  7 years agoPost 26
fenderstrat

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http://www.curtisyoungblood.com/Rav...ual%20Final.pdf

page 92 for anyone that wants to see

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12-27-2010 02:44 PM  7 years agoPost 27
Supercoolheli

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ok i know that i need to adjust the servo arm 90 to the ground, frames, tail pushrod, ect., but this is the whole reason i suggested sub-trim. When i put the arm on the wheel (with RX power on so gear is centered), there IS NO WAY that the arm will rest at 90! It's either a little cocked to the left, or a little to the right. I could adjust this with links but that would throw off the tail pitch slider. that is why i suggested sub trim but if someone can possibly think of another way please let me know

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12-27-2010 02:50 PM  7 years agoPost 28
fenderstrat

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Aston,Pa

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it was already posted

you have 2 choices

subtrim or get/make an arm or wheel thats 90,its as simple as that

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12-27-2010 02:52 PM  7 years agoPost 29
Hellsiege

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Colorado Springs, CO

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I would just subtrim it then, actually I have 10g and there is option to adjust 90 positiong of servo in helicopter mode. Not 100% sure of the negative impacts of doing this, but like subtrim as long as it's what the gyro see's as zero your fine IMO.

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12-27-2010 02:53 PM  7 years agoPost 30
Supercoolheli

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Dallas, TX

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yes and i would like to use subtrim because with this arm, i'm BARELY off and i already have the perfect distance from the center i need for the helicopter, but it was mentioned that i can't use subtrim with a flybarless helicopter for some reason?? I've never heard of this before

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12-27-2010 02:57 PM  7 years agoPost 31
fenderstrat

rrProfessor

Aston,Pa

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there is nothing wrong with using subtrim here,this is EXACTLY what it is designed for.

the radio sees this as the new center point and it should not affect any electronics.the radio reads trim and subtrim completely different

trim is seen as an input and is sent to the rx as such
subtrim is an adjustment to the center point of the servo and is not sent to the rx as an input.it affects NOTHING but the center point of that specific servo

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12-27-2010 03:00 PM  7 years agoPost 32
michael88997

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Lewisville,Tx

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you cant use subtrim if you set it and dont reset your endpoints, putting in subtrim is just like adding trim if u dont do anything else, but as long as you go back and reset your endpoints and center, unlike trim, it will see that point as the new center

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12-27-2010 03:03 PM  7 years agoPost 33
Supercoolheli

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Dallas, TX

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Michael, you said that i needed to reset endpoints (which i knew and i will do that) but you said reset center after sub-trim. I assume this was just a typo as the sub-trim itself is resetting center, correct? Just gotta make sure

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12-27-2010 03:06 PM  7 years agoPost 34
fenderstrat

rrProfessor

Aston,Pa

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you cant use subtrim if you set it and dont reset your endpoints, putting in subtrim is just like adding trim if u dont do anything else, but as long as you go back and reset your endpoints and center, unlike trim, it will see that point as the new center
I'm sorry but this is not correct.try it.go to your heli and add a bunch of subtrim to the tail servo and see if your endpoints change.they wont.subtrim has no affect on servo throws only the center point

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12-27-2010 03:08 PM  7 years agoPost 35
Supercoolheli

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Dallas, TX

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fenderstrat, so you're syaing that i can add sub-trim to correct my 90 degrees centering, and i will NOT have to reset the endpoints in the Total-G? It would make sense to me that i would but maybe you're right.

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12-27-2010 03:11 PM  7 years agoPost 36
michael88997

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Lewisville,Tx

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yes i know it doesnt affect the throws but the gyros that ive done that on you have to reset the center point and the way to do that is set the endpoints.... besides simply resetting endpoints isn't going to hurt anything

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12-27-2010 03:11 PM  7 years agoPost 37
fenderstrat

rrProfessor

Aston,Pa

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your heli will not explode,try it.center the servo with subtrim and see if your endpoints change.

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12-27-2010 03:12 PM  7 years agoPost 38
Supercoolheli

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Ok i'll try it right now and get back to you in a few minutes

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12-27-2010 03:14 PM  7 years agoPost 39
fenderstrat

rrProfessor

Aston,Pa

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once you set the subtrim and do final set up of the gyro/tail,every time you turn the heli on it will read the new center point and all will be good

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12-27-2010 03:19 PM  7 years agoPost 40
Supercoolheli

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Dallas, TX

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Ok i just tried it to see...I added subtrim (needed left) until it looked 90 degrees (i'll probably be more exact later) and i got to 27 on the subtrim. is that too much? Also, when i was at 27, and the servo arm was center, the tail pitch slider was way off, and to center THAT, i needed to move the stick in the RIGHT direction, going back on what i just corrected with subtrim. So the adjustments to correct the center of the pitch slider and the servo arm are contradicting themselves. Any ideas on this? haha

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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Sub-trim on tail servo
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