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Raptor E325
mini titan tail questions / gyro setup
redvtr1000

Veteran

covington, GA

Hey all,

Got a mini titan, dx7 w/ AR6100, GY 401, stock motor/esc, hitec hs65 on the swash and futaba s9650 on the tail.

First heli I have ever built. My question concerns the tail. I have set everything according to the manual and feel its ok there but I have an issue with limiting the travel.

If I use the limit pot to limit servo travel I am losing some range of movement. When I don't have it limited, full right rudder will cause the linkage to hit its max mechanical travel and then flex/bow out. There is no problem with left input, just hits the stop of travel and thats it though you can hear the servo make a little noise. When i use the limit pot to limit the travel to the right and keep it from binding up, I get full range without problems to the right but I lose about 1/16 inch of travel to the left (give or take).

Is there a way to limit travel in one direction without affecting the other?

Servo in neutral position, horn is 90 degrees to the pushrod with the tails pitch slider in the neutral position (gives roughly o degrees pitch on the tail). <---just provided that info so you all know those aren't the obvious answers.

10-04-2007 Over year old.
HollandRaptor

Senior Heliman

The Netherlands

Limit the ATV setting in your TX or use the limit screw on top of your Gy401

R30V1
R50 Titan/os 50 Hyper
E325 Mini Titan

10-04-2007 Over year old.
redvtr1000

Veteran

covington, GA

done that

What is the ATV setting. I have not seen that page in the setup on a DX7. I have a travel adjust page but have been told that limiting it there only affects the piro rate.

Did you read my post? I explained that I can limit it with the limit pot on the gyro but when doing that it makes the travel to the right (pitch slider moving away from tailboom) ok but limits the travel on the left (slider moving towards the boom)

So, limiting fixes one problem but creates another one.

Is there a way to limit just one direction? As I said before I am a NEWB when it comes to setup though I have learned alot. Please don't reply with a bunch of acronyms or abbreviations, I won't understand.

10-04-2007 Over year old.
beidle99

Senior Heliman

West Deptford, NJ

Don't worry about being the NEWB, What you need to do is loosen your servo mounts slightly and move your servo forward (adding a few degrees of pitch) This added pitch with allow for better heading hold, the heli will have less tendency to drift. You can then adjust your limit pot. Don't worry so much about getting equal travel to opposite side as the heli will then be piroing with the blades, (less pitch is needed for equal piro rates).
Check out this link it will help even though it is for a logic tech gyro the principles of mechanical set up are the same.
http://www.rcgroups.com/forums/showthread.php?t=670786

good luck

Who raised the ground since I took off?

10-04-2007 Over year old.
redvtr1000

Veteran

covington, GA

Ok, I see what you are saying about moving with the blades. You are talking about the gyroscopic effect the main rotor has and how it will take less force out of the tail to piro in that direction.

I have yet to spool up the main rotor on this heli yet, I will make those adjustments and set the limit tonight and roll with it from there. Maybe even get a little power going on and see what happens.

Thanks for the advice

DA

10-04-2007 Over year old.
HollandRaptor

Senior Heliman

The Netherlands

Everybody needs to learn so keep asking the questions you need to got answered.

The ATV setting is the amount of travel for your individual servo's. It basically helps you getting the maximum amount of travel without binding. Binding will shorten the life of your servo and decrease your flight time. The tip from beidle99 will surely help you out.

Don't know about the DX7 but the with the Futaba range of transmitters you'll be able to adjust the ATV percentage left or right.

Good luck and let us know how it turns out.

R30V1
R50 Titan/os 50 Hyper
E325 Mini Titan

10-04-2007 Over year old.
fenderstrat

rrProfessor

Aston,Pa

The ATV setting is the amount of travel for your individual servo's. It basically helps you getting the maximum amount of travel without binding
this is NOT true for the rudder ch when running a gyro...the ATV does not affect the servo limit at all.IT controls PIRO rate.....set your limits using the limit pot on the gyro(401)then adjudt your ATV for the piro rate you want.......I am not saying this to sound like a jerk but before you give advice to a noob be 100% sure it is correct that is how misinformation is spread

as far as the limit when using a 401 you will never be able to get full travel on both sides of the pitch slider.thats one of the main downfalls of a 401...but set it up to have full travel without binding on the close side and you will be fine....once set up properly the 401 is a great gyro

Compass helis Support Team
PerformancePlusRC field rep
Mini Titan/SE
TEAM KBDD

10-04-2007 Over year old.
denheli

Veteran

aurora,co

redvtr1000,

Send a PM to either of these two guys, Fenderstrat or Micro-maniac.
They helped me set up my tail w/401.THEY ARE GOOD AND KNOWLEDGEABLE.
Tell them the guy who can't flip switches (inside joke) sent you.

Always Learning LOGO 400 V-bar, TT R50 V2 Blue, RJX Xtreme 50, Vibe 50N, TZ Frenzy 50.

10-04-2007 Over year old.
dynodude

Heliman

El Cajon, ca

Why would'nt he just set his servo to 90 deg., loosen the servo mounts, and set the pitch slider in the middle of the shaft? would'nt that give equal throw on both sides? Then, wouldnt he also be able to adjust end points on gyro, and adjust piro rate independently left and right using EPA on x-mitter?

10-05-2007 Over year old.
fenderstrat

rrProfessor

Aston,Pa

DYNODUDE...you can do that, but the gyro can drift a little when you set it up like that...the proper way(manual/futaba web site) to set up a 401 is in rate mode and you need to move the servo forward to get it to hover in rate mode(it needs slight right pitch) which means you wont have equal travel on both sides of the tail pitch slider
thats the way the 401 is designed

Compass helis Support Team
PerformancePlusRC field rep
Mini Titan/SE
TEAM KBDD

10-05-2007 Over year old.
redvtr1000

Veteran

covington, GA

thanks for the help

Ok guys,

Great info. Thats what I was thinking on the endpoint adjustment in the radio. It sounds like it adjusts "endpoints" in my opinion but obviously not. I moved the servo up and down the boom last night to the point where I think it should be good. In rate mode, servo horn is 90 degrees to the pushrod and I get almost full travel both ways.

There really was no way to get full travel in both directions but it is real close (full one way and almost the other). I think it should be good.

Programmed the esc after that, and then buttoned things up and spun her up a little after that. Everything is looking pretty good. I never went over 1/3 throttle but tail control looks like it should be excellent.

Thanks for the input,

DA

10-05-2007 Over year old.
fenderstrat

rrProfessor

Aston,Pa

the EPA/ATV (same thing) it DOES adjust the servo endpoints on every channel except when using a gyro....just so you are clear on this, as you may need to adjust endpoints on the cyclic servos eventually, its done on the EPA/ATV menu on the radio

Compass helis Support Team
PerformancePlusRC field rep
Mini Titan/SE
TEAM KBDD

10-05-2007 Over year old.
superfreak

Heliman

lakewood, CO, USA

I just figured it out

I was having the same problem with my titan. The problem is we are trying to set up the gyro like most other gyros. With most gyros trim on the transmitter are to be set at zero but that is not the case with the GY401. With this gyro you set your travel with the limit pot on the gyro then you hover and set the drift with the trim on the transmitter(not with the linkage). The gyro reads the trim as the neutral point. The Gyro will read the netral point every time it is powered up, and the gyro always has to be set in HH mode when powered up after that you may switch it to rate if you wish. The instruction that come with the gyro explained it well, the instructions I found on the net from other people were incorrect. Since we were setting the drift with the linkage we were taking the center point and moving it to the right and that is why we wre binding at the right. I will try this tommorrow, it seems very easy to set up now that understand what I was doing wrong.

01-10-2008 Over year old.
BarracudaHockey

rrMaster

Jacksonville FL

Just set it to rate mode with the servo arm at 90 degrees to the linkage.

Center the tail slider.

Set the limit pot for no binding.

Leave it in HH and fly happy.

Andy
AMA 77227
http://www.jaxrc.com

01-10-2008 Over year old.
superfreak

Heliman

lakewood, CO, USA

gy401 set up

Thank you gain I have already set up my heli. I set up my servo and linkage to center the tail rotor at zero with the servo horn at 90 degrees. Then I adjusted the sub-trim to position the tail rotor where I have set it before at 24mm gap and the tail rotor ends (with rotor blade folded into a "V" shape which is about 10 degrees pitch. It flew perfectly straight in rate mode with no other adjustments needed. I have full travel end to end, great pirouette and tail is holding dead on. I tested all flight modes and in both rate and HH. I did all this in my living room not much room to fly but everything seems perfect.

01-10-2008 Over year old.
kirk

Veteran

Northern, Colorado

superfreak

Sounds like you got it going good now. If you get to a point again where you need a hand feel free to shoot me a PM. If nothing else it would be cool to meet you guys and do some flying...

Take care!!
Kirk

01-10-2008 Over year old.
superfreak

Heliman

lakewood, CO, USA

yeah it would be fun to get together with some people to fly I am sure I would learn alot. I am new to flying. I did get a blade cp and 3dxl but have not realy done any flying cause I was trying to fly without learning how to properly set up the helis, it was not working to well for me. It was a big mistake starting into the hobby with rtf birds (and not so good ones at too). So now I have built me a mini titan and I think I have learned how to set it up properly now (been doing this all on my own). I won't be flying right away still waiting for my batteries to arrive they are out of stock (I ordered some airthunder batteries). Maybe we could get together at chatfield res or something I hear they have an air field there. I am not free on weekends though (I work at american furniture warehouse).
I have gotten pretty good on the simulator but have no real time other then some hovering with the real thing. Tim

01-11-2008 Over year old.
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mini titan tail questions / gyro setup
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