Lepton Gyro Gain

[Bellypopper]

Hi All,

I am just completing the setup of my Lepton. I have fitted a Futaba GY401 and S9650 tail servo. When I first spooled it up, I had the gain in normal and heading hold mode set to 60% - the tail wagged like mad :(

In order to minimize the wag, I have had to turn the gain down to under 30% in both modes. The tail wag is still there, but not as bad. I have also noticed I have vibration, as the vertical fin is a blur

Anyone have any suggestions?

Cheers
Russ

[poerqwa]

I believe the concensus for the hole in the servo wheel is 12,5mm.

Is that the case in your situation?

My gain is about 50% (but showing some wag sometimes) with the same setup and the hole at 12,5 mm.

I'm at the point of installing a 9254 and know from previous experience that a faster tailservo really makes a difference in gain.

Greetz,

Marc

[Finless]

I have had problems with the FP main blades along with several others I know. They balance fine but cause vibes in the heli which comes and gos... Very odd I know. At the buzzin the border fun fly a guy I had never met was complaining of the same thing... I loaned him my blades and problem solved. Yes this vibe does effect the gyro if you have it mounted in the normal place.

I am running 36% in my GY menu on my Fuatab radio.

Bob

[poerqwa]

Bob,

I guess your running a 401 on the tail ?

Don't you have issues with torque? With a gain that low my tail will not hold (using standard tailblades though) when working on the pitch (only -5 to +8)!

Greetz,

Marc

[Finless]

No I am not having a problem and yes I am using a 401... I am running 11/11 pitch. My tail only lets go on really hard use of collective.... I can pump straight up and the tail holds but if a unload the head then load it up hard the tail will let go with the stock blades.

Just some tips:
1) Make sure the belt is tight.... The Lepton needs the belt to be tighter than one would think initially... It can slip on the main pulley.
2) Make sure the pitch slider is not binding or maybe the bearings in the tail grips.
3) Some have reported that the anodization on the tail case can PINCH the tail shaft bearings and make the gritty. Make sure yours are smooth.
4) 12.5mm on the servo wheel! It is important that the 401 limit pot be between 80 and 100... Not way under 80 and not way over 100 for optimum effeciency of the gyro. I find right around 80 really works well!

Bob

[Bellypopper]

Thanks Guys for you help. The tail linkages feel smooth enough, but will check them once more. I have the tail servo arm at 12.5mm, and travel at about 85 ish. I have just noticed that the belt is quite loose (if I hold the tail blades and try and turn the main bladed, the belt will jump on the main gear. I have tightened the belt now

The other tihing I have just noticed is that I had the d/s dip switch on the gyro set to off :oops:

Just waiting for Lipo to charge and will give it another try

Cheers
Russ