need some help

[HarleyD]

Falcon 400 3d

had a bad crash rebuilt the back end of the bird

now when i power up it spins counter clock wise until i shut it off

cant figure out whats causing the problem

i can see the gyro trying to compensate but still spins outta control
 any ideas?

[rufus]

try sliding your tail servo up / down on the tail boom

[pinoydad]

check your tail slider if free of bind..maybe disconnect the linkage so you can slide it manually see if there's any bind other wise see about the reply b4 me

[helikido]

first of all try to reverse your motor wires so that it spins clockwise. also put the gyro gain higher so that it can compestate. any way it can't comestate very good if the rotor is spining on the wrong direction.

[rufus]

first of all try to reverse your motor wires so that it spins clockwise. also put the gyro gain higher so that it can compestate. any way it can't comestate very good if the rotor is spining on the wrong direction.

If the motor is spinning the wrong way then the shaft won't catch on the one way bearing and nothing will happen

[helikido]

first of all try to reverse your motor wires so that it spins clockwise. also put the gyro gain higher so that it can compestate. any way it can't comestate very good if the rotor is spining on the wrong direction.

If the motor is spinning the wrong way then the shaft won't catch on the one way bearing and nothing will happen

oh ok,but then how the heck is this happening.

[rufus]

first of all try to reverse your motor wires so that it spins clockwise. also put the gyro gain higher so that it can compestate. any way it can't comestate very good if the rotor is spining on the wrong direction.

If the motor is spinning the wrong way then the shaft won't catch on the one way bearing and nothing will happen

oh ok,but then how the heck is this happening.

Well his servo isn't Able to fully control the tail - it needs to he moved

[HBFP Pilot]

also make sure the boom didn't slide in and loosen the belt, that can also make the heli spin around uncontrolably as the tail rotor won't be spinning fast enough because of the belt slipping

[RDA]

i lossed a keeper screw of the blade grips on the tail   it would spin  but without effect  LOL.....

[nheli]

first of all try to reverse your motor wires so that it spins clockwise. also put the gyro gain higher so that it can compestate. any way it can't comestate very good if the rotor is spining on the wrong direction.

How do you come up with this answer?  What is the reason and the physics to reverse the motor wires and put the gyro gain higher so that it can compestate to correct the problem?  Have you actually experience a repaired heli spins counter clockwise?

The Falcon 400 has a one way bearing in the main gear hub, the tail is belt driven, if the motor spins in the wrong direction, the main gear just spin free and the main shaft will not rotate.

"when i power up it spins counter clock wise" and "rebuilt the back end of the bird" , this is a good indication that the tail has no authority to counter the main rotor torque, since the heli was flying OK and assumming the gyro and tail servo have not been touch or change, it is very likely that the belt is flipped in the wrong direction that the tail blade turns in wrong direction.

[helikido]

first of all try to reverse your motor wires so that it spins clockwise. also put the gyro gain higher so that it can compestate. any way it can't comestate very good if the rotor is spining on the wrong direction.

How do you come up with this answer?  What is the reason and the physics to reverse the motor wires and put the gyro gain higher so that it can compestate to correct the problem?  Have you actually experience a repaired heli spins counter clockwise?

The Falcon 400 has a one way bearing in the main gear hub, the tail is belt driven, if the motor spins in the wrong direction, the main gear just spin free and the main shaft will not rotate.

"when i power up it spins counter clock wise" and "rebuilt the back end of the bird" , this is a good indication that the tail has no authority to counter the main rotor torque, since the heli was flying OK and assumming the gyro and tail servo have not been touch or change, it is very likely that the belt is flipped in the wrong direction that the tail blade turns in wrong direction.

didn't he say the blades spin counter clockwise, maube i got that wrong oh well. one other thing you forgot the belt may be too lose.

[nheli]

didn't he say the blades spin counter clockwise, maube i got that wrong oh well. one other thing you forgot the belt may be too lose.

Are you freaking out, the first thing you do after you repair the tail is to check the belt tension, most people will setup the belt a little on the tight side, you never did any repair in real life, didn't you.

[Starcruiser]

Falcon 400 3d

had a bad crash rebuilt the back end of the bird

now when i power up it spins counter clock wise until i shut it off

cant figure out whats causing the problem

i can see the gyro trying to compensate but still spins outta control
 any ideas?

@HarleyD,

First thing to do is take the gyro out of the loop (disconnect it) and have the rudder/tail servo plugged directly into the Rx (chnl 4 I believe it is the RTF unit). Make sure the tail slider moves in the direction to make the nose go in the direction you push the left Tx stick. Look at the tail setup, the blades will turn counter clockwise when looking at them (they turn up into the main rotor wash). If this is working correctly, then adjust the links and arms to make sure they are at 90 degrees (tail and servo). You do this by : You will need to turn the radio on (Tx first then Rx, make sure you pull the motor wires from the ESC to prevent an accidental start up). If they are not, remove the servo arm and reposition it, then use sub-trim to finish it off if it is not perfect. After that loosen the boom mounts for the servo and slide the servo towards or away from the tail to make the tail arm 90 degrees. The radio was on the entire time to make sure if you move the arm it re-centers itself.

Now after this is done turn off the heli and reconnect the gyro to the Rx and the rudder servo to the gyro. Once that is done power the heli up again and wait, look at the gyro, the light will go solid, if it doesn't flip the gyro switch on the radio, it should then. Now, flip the switch back to the rate position (non-HH), the gyro led will go out. Test the rudder stick again, does it move in the same direction as before? if not then the gyro is changing the direction and needs to be adjusted, look at the 2 pots on the gyro, one is limit or gain and the other is reverse or direction, turn the one for direction all the way oneway or the other, this will then reverse the signalling to the gyro and fix the response issue. Once that is done you will need to tweak the gain/limit pot. This will stop the gyro from over driving the servo and causing a binding condition. While pushing the stick to the left or right turn the gain/limit pot to reduce the servo travel to where the slider on the tail just reaches the end of its travel. Check the travel in both directions. when the rudder stick is in its neutral position the tail slider should be in the middle of its travel. Power down the heli and then power it up again, allow the gyro to reset, make sure the Tx Gyro switch is in HH mode otherwise it will not initialize. Flip it back to rate mode again and recheck the tail slider travel, should be the same, if it is your all done. If not recheck your work. If all this now checks out power down and reconnect the motor leads, flip the switch to HH mode and take it out for a hover. Please note that the gyro may push the tail slider in one direction when in HH mode when you either move the heli or the rudder stick when the heli is not flying (motor is powered up).

Please note that some trimming might be required in rate mode but HH mode you might get some tail wag if the gain knob is set wrong.

Check out helifreak.com for more info on setting up your bird.

Good Luck,,
Carl

When this happens the gyro is usually moving the servo the wrong way, check the gyro direction pot.

[helikido]

didn't he say the blades spin counter clockwise, maube i got that wrong oh well. one other thing you forgot the belt may be too lose.

Are you freaking out, the first thing you do after you repair the tail is to check the belt tension, most people will setup the belt a little on the tight side, you never did any repair in real life, didn't you.

of coarse  i did what did ya think.

[nheli]

of coarse  i did what did ya think.

lol,

I was the one and the only person in your "CRASHED" to show you how to use a hammer to straighten the feathering shaft in your crashed Belt CP.