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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › heli set ups flying out of control
04-26-2014 02:44 PM  6 years ago
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busaboy98

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gardner ma usa

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heli set ups flying out of control
I have a blade 450 x and can't get it off ground bought it couple years ago when I had no clue how to fly helis was just starting out from mcx 2 to 450x who knew. after moving up a little slower now 130x flying good the 450 has been broken many times in the mean time.upgraded sevros to alin with metal gears also have a 300x which I have flown but crashed but allways seemed to repair and fly again but the 450x when trying to get off ground just flies off uncontrollable and crashes once just flipped over and was spinning on main rotors kinda funny but scary . the repair all broken stuff then again same thing. all mech adjustment done tried relearning ar7200 went through all adjustments also tried changing set up on dx8 to tune down now the 300x is now become controllable what the f#$k am I doing wrong get very frustrated please help
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04-26-2014 03:28 PM  6 years ago
wrongler

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Brewerton, New York

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Here's a few things to check.
Are the tail blades going and facing in the correct direction? Is the control on the tail grips correct? When you check it on the ground are all the controls moving correctly? Are the FBL controls correcting in the proper direction? Have you adjusted the gain?
Bill Whittaker
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04-26-2014 03:34 PM  6 years ago
busaboy98

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gardner ma usa

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fbl controlling correct tail ok not spinning go up then to side how do set gain? explain what gain does
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04-26-2014 05:38 PM  6 years ago
dkshema

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Cedar Rapids, IA

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Not all servos turn the same direction for the same stick input when plugged into a given radio.

If you have a JR/Spektrum radio, and use Futaba servos, you will find that if you replace the Futaba servos with JR, you need to reverse all your channels, as Futaba and JR turn opposite directions for the same stick input. Some manufacturers follow the Futaba convention, some follow the JR convention. YOU need to make sure they move correctly, no matter WHO made them.

If you replaced Eflite servos with Align servos, there is a good chance that you need to reverse the direction of movement.

With your 450X sitting on the ground, if you push the elevator stick forward, the front of the swashplate must tilt down.

When you push the aileron stick to the left, the left side of the swashplate needs to tilt down.

As you push the collective/throttle stick forward (positive pitch) the leading edge of the main rotor blades needs to move UP.

I believe that the tail rotor uses leading edge control of the blades, and that would mean right rudder needs to make the servo pull the tail rotor pushrod forward.

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You need to go completely through the AR7200 flybarless setup steps and make sure your helicopter mechanics are properly set up as well. If you are not sure of what you are doing, find local help if at all possible.

It is apparent you are not sure how to properly set up a helicopter and flybarless controller from scratch. And you have no idea what gain is, or how to set it. That is not a good recipe for success.

Local help is indispensable at your stage of learning.

Gain refers to the gain of the tail rotor gyro. It adjusts how aggressively the gyro will react to yaw movements (low gain, it takes a larger amount of movement before the gyro corrects. High gain, the gyro reacts to very small variations in yaw).

Even with low gain (as long as the gyro is in heading hold mode) the tail should not whip around uncontrollably.

If you have set up your mechanics properly, and have run through the FBL controller settings properly, the heli should not have a mind of its own and be completely uncontrollable.

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Check your control movements first for correct direction. Make sure the FBL controller also responds correctly when you tilt the nose of the heli down, and when you tilt the heli left or right - the swasplate needs to move in the opposite direction of the movement. Make sure the tail rotor gyro pulls the tail rotor pushrod forward if you turn the nose of the heli to the left.

ONLY if everything moves in the correct direction do you attempt to fly.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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