Tail not holding well in fast decents and sudden stops!

[Supercaptaincrash]

i have a gy 601 on my 600nsp and currently have it 55% on the gain! the tail holds solid on circuits,hovering and general flying about but as soon as i do fast descents or sudden stops the tail very gently kicks out! is this something im gonna have to live with or have i missed something in the set up?

[ChrisP]

What headspeed are you running on the 600?
Are you using a Gov?

Usually it should run at 2050rpm (or slightly higher or 100% in gov mode (Align Gov and JR/Spektrum figure quoted)

EDIT: just noticed your signiture lol. Not had anything to do with a GV-1 to be honest.

[moyesboy]

have you tried increasing the gain? or does it wag if you go higher?

It sounds to me like the gain is not high enough for the gyro to react quickly to stop the tail swinging out when you apply power suddenly.

without knowing your Tx the % number is hard to judge. On my Dx7 my gain channel end point was 80% running a 401 on my trex500. I've never had a 601.

[Supercaptaincrash]

tried upping gain very slightly but made no visible difference! im using a dx7! gonna go out tomorrow evening and play around with the gain a little hopefully!

[moyesboy]

Up the gain a lot then if a little made no difference.
when the gain gets too high the tail will wag - its quite a furious wag (the speed of a happy dogs tail in fact) . sometimes it doesn't start until something sets it off like a gust of wind or a brutal rudder control.


with the gain too low the stops are imprecise, the tail swings out whenn you pump the pitch, and its all a bit wandery and imprecise. sound falmiliar?

When you are just a little above optimum gain, then it flies OK but will bounce a little on a sudden piro stop.
also with the gain a bit too high it can wag in fast forward flight, even though nothing will provoke it in the hover.

[Supercaptaincrash]

thanks for that moyesboy! thinking back it probably did kick quickly when using the pitch hard!! i will up the gain some tomorrow and see how it goes! cheers pal!

[trillian]

thanks for that moyesboy! thinking back it probably did kick quickly when using the pitch hard!! i will up the gain some tomorrow and see how it goes! cheers pal!

I have one heli with a 601 but I just got it in December (the one in my avatar) and have only setup the TX and hovered it a little bit, still adjusting the high needle etc.

But I just had a look and I have it at 72% gain right now. Obviously these are just numbers and it's all relative so the optimum gain for that heli / tail servo etc. will be different.

[ktargett]

The GY601 is just about the easiest gyro to setup. Just set the gain to 37% AVCS on the display screen, choose the servo arm length to get about 100% travel without binding in both directions then fly. It should completely locked tail, it is only the piro consistency that is very slightly lacking on this gyro.

If this doesn't work then there is something mechanically wrong.

Don't use the number on the Tx as an indicator - you may find 55% is only actually about 5-10% heading hold gain or even normal rate, because everything below 50% is heading hold and everything above is normal rate or vice versa.

Or read this:
The GY601 3D setup

Kevin