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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsSpektrum › Weird reaction with an AR7200BX
07-02-2014 03:28 AM  6 years ago
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flykilbosa

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Penfield, NY

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Weird reaction with an AR7200BX
So I just installed an AR7200BX in a Blade 300X that I bought used and when I go from normal mode to idle up 1 or 2 the helicopter rolls/banks to the right about 10degrees as thought it's not balanced(it's not an abrupt bank, just a gentle roll that stays there). Again normal mode she flies ok but as soon as the head speed spools up she has a bank/roll tendency to the right? All servos are not stock, the 3 cyclic servos are Hitec HS 5055MG's. I reset/reprogrammed the AR7200BX when I installed it with the proper frequencies for the servos. The 3 pots on the 7200BX are centered and I've tried adjusting the "gyro" setting on the idle up settings in my new Spektrum DX6 and no luck. Any ideas?
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07-02-2014 03:34 AM  6 years ago
cudaboy_71

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sacramento, ca, u.s.

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might you have some left trim set in your normal flight mode, not present in the others?if it ain't broke, break it.
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07-02-2014 03:37 AM  6 years ago
flykilbosa

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Penfield, NY

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All trims are at zero/center. I looked at that but no joy.
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07-02-2014 03:41 AM  6 years ago
cudaboy_71

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have you tried setting IU1 to the same headspeed/pitch as normal flightmode?

just trying to rule out radio settings v. beastx settings. it might be a vibration issue only manifesting with the change in headspeed.
if it ain't broke, break it.
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07-02-2014 06:00 AM  6 years ago
AWittleWabbit

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O.C., CA

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I second vibration.

What cudaboy mentioned would be a good way to eliminate vibration as the cause.

PS, I had the best results using 3m tape instead of the stock white tape.
Heli-itis sufferer.
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07-02-2014 09:16 AM  6 years ago
flykilbosa

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Penfield, NY

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I have not tried that but I will give that a go this afternoon after work. Thanks and I'll report back
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07-02-2014 10:20 AM  6 years ago
wrongler

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Brewerton, New York

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Do you have IU2 set? If you do what does it do there?Bill Whittaker
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07-02-2014 12:49 PM  6 years ago
flykilbosa

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Penfield, NY

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IU2? I'm still new with this.....what is IU2?
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07-02-2014 02:18 PM  6 years ago
sabooo

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Allentown, PA area

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This is almost assuredly caused by vibration ( search for BeastX right roll of death.) Check your shafts (main, feathering and tail!), blade balance, main shaft collar. Also check your blade alignment. Once you cure that vibration, the sudden pitch to the right will disappear as well.

I was going to take up Origami, but someone said the local club folded.
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07-02-2014 02:38 PM  6 years ago
cudaboy_71

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sacramento, ca, u.s.

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IU1/IU2 = Idleup 1/Idleup 2if it ain't broke, break it.
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07-02-2014 02:41 PM  6 years ago
Pistol Pete

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Seffner, FL

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Process of elimination...
Used heli...
Remove all blades and spool up.

Check for vibs by holding boom while testing all flight modes, N, IU1 and IU2.

If vibs are present, start removing parts off shafts. 1st (head) then tail hub with grips.

If none found, change blades and or head speeds.
~~Enjoying the hobby one flight at a time~~
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07-02-2014 04:44 PM  6 years ago
flykilbosa

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Penfield, NY

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Awesome responses...I'm gonna do some surgery tonight! Thanks
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07-03-2014 05:13 AM  6 years ago
PilotPin

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Indiana -- USA

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Yes, probable vibration. Check/replace the head dampeners they don't hold up very good on the 300x. Especially if it's been crashed.
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07-03-2014 09:39 PM  6 years ago
flykilbosa

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Penfield, NY

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So I moved the 7200BX to the bottom side of the helicopter frame (I think that's the stock location). The right roll tendency in narmal/IU1/IU2 is gone! Nice! Thanks for the info! That turned into a different issue ...The motor cuts out every now and then now?
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07-03-2014 09:44 PM  6 years ago
cudaboy_71

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sacramento, ca, u.s.

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on and off really fast, causing the tail to wag (you're running your packs down to LVC (low voltage cutoff). this is the expected behavior but will kill your packs quickly. run a timer on your TX so you don't do that.

or, cuts off and you have to auto down? could be a loose solder anywhere in the motor/esc/battery circuit, or a loose signal plug (the servo connector coming off the ESC.)
if it ain't broke, break it.
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07-10-2014 03:34 AM  6 years ago
flykilbosa

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Penfield, NY

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Swapped out the motor and esc and no more issues. I'm thinking the esc was the problem based on how it was reacting. Thanks!
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07-13-2014 03:18 AM  6 years ago
icanfly

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ontario

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jeepsters, why does everyone call things idle up this or that when it's normal/idle up and st1 or stunt 1 and st2, stunt 2. That is Idle up, st1, st2. Idle up means just that, the left stick is all the way down and the throttle is increased when the left stick is moved to center position, thus "IDLE UP".

Gyro, what did it come from? Gyro gain setting too high in the tx? If I remember correctly I had to adjust this in my tx when going from the 300 to a 450.
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