Second bank for Autorotation

[bruno95]

Hi,

I would like to use second bank for autorotation (especially avoid unattended reactions at the end of auto when touching the ground).

Which parameter is best to tune versus idle up mode ? (Hiller gain reduce or bell gain ?)

Thanks

Bruno

[Skookum]

You probably want both Bell and Hiller to be higher for a low-rpm (autorotation) bank. If you're using banks, the Bell gain can be set for each bank.

The "unattended reactions" at touchdown might be partly due to the RPM being lower than you think. I'm a big fan of the challenge of 450-size heli autos (many repairs as a result but its fun), but one sort-of-drawback to flybarless is that its quiet and so hard to hear the blade rpm when autoing. Your only other clue to rpm is aerodynamic sensitivity, but the SK360 hides that from you too, right up until the point where it falls over because the blades are barely moving. What's needed here is a heads up display for rpm :-P

[bruno95]

Hi,

Thanks,

Then i'll try with higher values on both Bell and Hiller on my next trials....

Best regards

Bruno

[RobertAbles]

My T500 autos beautifully with my tuned 3D program... Awesome...

All V-bar machines are touchy in the last couple seconds of setting the bird down and spool down, as they don't have any type of rpm/headspeed sensor, they WILL give ALL cyclic pitch in attempt to move the disc which means quick loss in headspeed and instability just before touch down.

Most crashes I have seen with FBL helis have been in botched autos. It can be ugly. If you ease it into a nice hover with good headspeed, it is NOT an issue from my experience on the T600 and T500 FBL.

Get it to a hover and be very easy on the cyclic is all, quick cyclic inputs during the last couple seconds with make wierd things happen if your not expecting it...

All in all. FBL has greatly improved my autos. Normal AND inverted...

[Skookum]

> they WILL give ALL cyclic pitch in attempt to move the disc...

It should take an equal amount of cyclic pitch with either flybar'd or flybarless to get a given flip/roll rate. So what might be happening is that the pilot expects (from their flyblar'd learning) to have to apply more cyclic stick near landing, to compensate for loss of control authority. But because the cyclic-gyro is a rate-command system, you don't have to do that. It will try to give you the same response no matter what the headspeed is.

So as robmoney said, focus on gentle stick motions as you approach the ground and rpm decays, or the SK360 will try to do what you ask, even if it requires huge cyclic pitch that bleeds rpm. Another idea might be to set lower "control rates" on your auto bank.