First Spool up Logo 500 :(

[itsparks]

More Heli problems, i think i know what it was too, no damage to the heli tho.

It looks like no damages as i just spent 45 min looking every thing over, i think that the belt tension pullys / pully was not seated fully and it seated fully when it was spooled up causing the belt to slip.. I could be wrong tho.

http://youtube.com/watch?v=m_h6GwBb09I

[Flybar-less]

Because it spun CW, your tail sensor is reverse of what it should be. If the tail drive had slipped it would have spun CCW.

[itsparks]

Because it spun CW, your tail sensor is reverse of what it should be. If the tail drive had slipped it would have spun CCW.


Ok, so now to fix this, i ahve to revers the servo ? I have also adjusted the tail boom IE pulled it out from the frame to tighten the belt, i shal go attempt another hover tomorrow.

I SO CANT believe i said That was Awesome :O SHOCKED!

[BruceW]

First check your rudder direction and make sure the tail blades deflect as they should to turn left/right. If that is correct then your gyro direction is reversed. I looked back and saw that you have a GY401. Just flip the 'Dir' toggle bit on the gyro and that should fix everything.

EDIT: since the helicopter basically spun around by itself, that indicates the gyro being reversed since it operates in its own feedback loop separate from the rx - but you should still check the rudder direction on the bench.

[itsparks]

First check your rudder direction and make sure the tail blades deflect as they should to turn left/right. If that is correct then your gyro direction is reversed. I looked back and saw that you have a GY401. Just flip the 'Dir' toggle bit on the gyro and that should fix everything.

EDIT: since the helicopter basically spun around by itself, that indicates the gyro being reversed since it operates in its own feedback loop separate from the rx - but you should still check the rudder direction on the bench.

Thanks I will check that and also setup the gyro so it is not over driving my tail arm.

[Flybar-less]

Vstabi setup
On the Overview page you can reverse the sensor. On the rudder page you can reverse the TX input and/or the servo. You need to check three things.

Right stick makes the servo arm move forward.
Left/CCW rotation of heli makes servo arm move forward.
Increase collective makes servo arm move forward.

Double check this on the bench. If not change settings and recheck.

[Flybar-less]

Bruce,
Thanks for catching the Gyro type. I was thinking Vstabi.

[OICU812]

Good thing nothing got wrecked, lesson learned hopefully man. Always check everything on bench to confirm everything is 100% prior to maiden. Glad there was no damage and you're not out the dough.

[ozsteel]

Reading this thread maybe there is a need for some clarification - I've had this problem happen to me!

The gyro has a reverse switch AND the TX has a reverse switch - both independent and different.

The gyro drives the tail servo independently of the TX so the gyro can be working correctly while the rudder is driven in reverse by rudder input from the TX.

If the gyro direction is reversed then as the tail swings the gyro gives more input to the servo which makes the tail swing more so more input - so, out of control! It is critical to the health of your heli that the gyro direction is set on the bench before the first spool-up. It is often difficult to change the gyro direction while installed as the switch is tiny and needs a very small screwdriver and some care to change - make sure is switched all the way and that the direction has changed.

The rudder should be tested as the heli gets llight on its skids to check the TX input is the right way. If not this can easily be changed by reversing the servo direction on the TX - not as catastrophic as having the gyro reversed.

Hope that this saves someone from destroying their heli on its first spool up.