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HomeAircraftHelicopterHelicopter Main Discussion › Ar7200 gyro advice
08-30-2013 01:52 AM  5 years agoPost 1
nick.gruber

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Lincoln, NE

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Looking for some advice on tweaking my ar7200bx on a 450 pro v2. When i do a "punch out" increase collective rapidly the tail goes to the right and comes back to its original position once I reduce the collective. Ive adjusted the gain to the highest setting on my dx8 without the tail wagging which is 85%. Any thoughts on what i need to adjust? I've tried adjusting the potentiometers on the controller itself to little avail.

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08-30-2013 03:37 AM  5 years agoPost 2
doorman

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Sherwood, Arkansas

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Tail Blow Out!!
From the info, a couple of suggestions.
Move ball out on tail servo
Increase hs...
Reduce the top end pitch
I would do one at a time and try each before the next..in the order I have them listed..
Then reset your gyro gain...take it to a wag, then back off a few points at a time to loose the wag...
Hope this helps you out..
Stan

AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft

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08-30-2013 04:03 AM  5 years agoPost 3
rudyy

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E. Amherst, NY

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Also check for any binding on the tail slider, and tail blade grips.

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08-30-2013 05:06 AM  5 years agoPost 4
Funky Trex

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Westerville, OH - USA

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85% is a really high gain on the dx8. I run a few 7200s and none are anywhere near that high. That probably isn't what is causing your problem, but it is probably over working your tail servo. My 450 runs low 30s in the DX8 gyro menu. My larger helis (550-700) running 7200s are in the 40-50% range.

How much pitch are you running? Does the motor bog when you give it full pitch?

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08-30-2013 02:17 PM  5 years agoPost 5
nick.gruber

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Lincoln, NE

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Thanks for the info. I'll try it out.

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08-30-2013 05:03 PM  5 years agoPost 6
altima1779

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Toledo, oh u.s

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Are you doing pitch pumps in normal mode or idle up?

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08-31-2013 02:27 AM  5 years agoPost 7
nick.gruber

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Lincoln, NE

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Normal. I guess i havent tried it in idle up

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08-31-2013 03:13 AM  5 years agoPost 8
altima1779

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Toledo, oh u.s

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If you set a flat throttle curve in idle up you will see a major difference.

There is no way the tail can keep up with the drastic change in headspeed when running a linear throttle curve.

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08-31-2013 05:23 AM  5 years agoPost 9
cudaboy_71

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sacramento, ca, u.s.

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what is your tail precomp set to?

if you have it turned off, turn it on. that's exactly what it's for.

if it ain't broke, break it.

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08-31-2013 10:25 AM  5 years agoPost 10
AA simon

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barcelos, portugal

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what is tail pre comp ?

how do you turn it on ?

I have exactly the same issue, I have a governor so the head speed does not drop, I can adjust the gain up till I have a tail wag but the tail will still kick out when I give it a full pitch pump.

Simon Ribeiro

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08-31-2013 12:50 PM  5 years agoPost 11
cudaboy_71

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sacramento, ca, u.s.

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short version: point F in the parameter menu

long version: when you add a lot of collective to the head, you introduce a sudden amount of torque to the airframe. even the best gyro can't instantly stop the tail from kicking. passively (reacting to the condition), the best it can do is quickly correct the condition after a tail kick has happened.

since the beastx/AR7200 is an active 3-axis gyro, it is capable of pre-loading the tail to compensate a tail kick when a lot of pitch is commanded BEFORE the kick happens.

On the beastx/AR7200 this is adjusted at point F in the parameter menu.

with a clockwise-spinning head (what 99% us non-scalers fly) this torque kicks our tail out to the right on rightside-up positive collective.

so, we want to add a precomp that will kick the tail a bit to the left.

start with normal-low and see if that helps. if the tail is still kicking to the right, try normal-high.

note that precomp is independent of motor speed. it is only relevant to pitch.

optionally: as a bench-check, put the heli in throttle hold (don't want it spooling up on you).
PUT THE COLLECTIVE AT MID-STICK (this is important).
use the left stick to center the tail to neutral
be careful to not bump the rudder, and go from midstick to full pitch.
with precomp enabled you *SHOULD* see a tiny blip of tail automatically added in the "nose right" direction.

if it ain't broke, break it.

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08-31-2013 02:38 PM  5 years agoPost 12
AA simon

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barcelos, portugal

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I never even considered that option, will try and report back, but it sounds like what I need!

Simon Ribeiro

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09-01-2013 03:52 AM  5 years agoPost 13
nick.gruber

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Lincoln, NE

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Yeah parameter F took most of it out but not all. Ill keep tweaking it

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09-01-2013 08:40 PM  5 years agoPost 14
AA simon

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barcelos, portugal

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sorry nick gruber for hijacking thread !

my tail is so much better now now, never even thought of this tail precomp, tried blue flahing light today and much better may try high setting tomorrow,

thanks cudaboy for the help!

Simon Ribeiro

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09-02-2013 06:09 AM  5 years agoPost 15
highrpm

rrApprentice

Shelby Twp,Mi

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did you tune your tail by flying/ hovering in rate mode first. the gyro will work optimally when you can hover with very little rudder input. I've had to go back and adjust my linkages to get a better holding tail.

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09-02-2013 10:47 AM  5 years agoPost 16
Richardmid1

rrProfessor

Leeds, England

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The problem:
Normal. I guess i havent tried it in idle up
The solution:
If you set a flat throttle curve in idle up you will see a major difference.
There is no way the tail can keep up with the drastic change in headspeed when running a linear throttle curve.

60% of the time, it works every time!

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