Skywalker people who have Cyclops Flight Controllers

[FPVSteve]

Surely that can't be right can it.  I mean about RTH taking longer to turn the plane in a wind due to weathervaning.  Planes don't weathervane in the air.  At least that's what I always understood.  Although things are different with a flight controller since they're always trying to keep the nose pointed at a heading whilst simultaneously trying to fly to that heading which is never going to be good if there's any kind of crosswind.  In fact thinking about it what sort of ground track would a plane on heading hold end up flying in a crosswind?  Can't get my head around it.

One of the main problems is that if the wind is trying to turn the aircraft by pushing the vertical stabiliser and your FC PIDs are low enough, it may not have enough roll authority to counteract the wind (the skywalker has loads of rudder authority), thus never actually make it home lol, especially if your cruise speed is set too low.

Interesting discussion - I've definitely noticed some weird RTH behaviour in moderate winds. It works, but sometimes needs a good few hundred metres to make a turn to home.

[English Turbines]

One of the main problems is that if the wind is trying to turn the aircraft by pushing the vertical stabiliser and your FC PIDs are low enough, it may not have enough roll authority to counteract the wind (the skywalker has loads of rudder authority), thus never actually make it home lol, especially if your cruise speed is set too low.

Interesting discussion - I've definitely noticed some weird RTH behaviour in moderate winds. It works, but sometimes needs a good few hundred metres to make a turn to home.

Steve..Be interesting if you manually added a little Rudder next time its in RTH...Just to see how much it helps...?

:vulture:

[elmattbo]

One of the main problems is that if the wind is trying to turn the aircraft by pushing the vertical stabiliser and your FC PIDs are low enough, it may not have enough roll authority to counteract the wind (the skywalker has loads of rudder authority), thus never actually make it home lol, especially if your cruise speed is set too low.

Interesting discussion - I've definitely noticed some weird RTH behaviour in moderate winds. It works, but sometimes needs a good few hundred metres to make a turn to home.

In flight, the aircraft doesn't know it's in any sort of wind (unless the velocity is changing). So from an aerodynamic aspect, I can't see how a cross wind will push the vertical stabiliser.
You are going to get some weird effects though when the wind speed is close to the cruise speed, particularly since the storm uses sequential GPS fixes to work out its heading.
As for bank angle, I've found that you need at least 30-35 degrees or you end up with a massive circle when flying RTH downwind. The storm tries to stay at 100m from you so it flies past you until it gets 100m away before turning back. If it's got a following wind it can get carried some way off, so a nice tight turn helps.
Don't worry about rudder, the storm just holds a bank angle and adds elevator to maintain altitude. So, although it's uncoordinated and the nose pitches up as you roll into the turn, once at the bank angle it will hold it ok without rudder.
I've never really understood the rudder turning thing that seems popular in RC; why is a flat turn desirable?!



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[Loopdreams]

On the rudder turn thing, in LOS flying it just looks bad especially with some nice scale plane if you aren't flying coordinated turns but just banking and yanking everywhere.  For FPV I tend to feed in rudder on the turns if I have it (and still keep trying to even if I'm flying a wing) just because it feels nicer, points the nose more towards where you're going and also because I'm so used to flying quads and helis before them that it's second nature to use all the controls.  It's just more fun/involving.

[English Turbines]

In flight, the aircraft doesn't know it's in any sort of wind (unless the velocity is changing). So from an aerodynamic aspect, I can't see how a cross wind will push the vertical stabiliser.
You are going to get some weird effects though when the wind speed is close to the cruise speed, particularly since the storm uses sequential GPS fixes to work out its heading.
As for bank angle, I've found that you need at least 30-35 degrees or you end up with a massive circle when flying RTH downwind. The storm tries to stay at 100m from you so it flies past you until it gets 100m away before turning back. If it's got a following wind it can get carried some way off, so a nice tight turn helps.
Don't worry about rudder, the storm just holds a bank angle and adds elevator to maintain altitude. So, although it's uncoordinated and the nose pitches up as you roll into the turn, once at the bank angle it will hold it ok without rudder.
I've never really understood the rudder turning thing that seems popular in RC; why is a flat turn desirable?!



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Its not so much a flat turn thats desirable (althought in a RTH situation it is)...Its that some planes including the SW1900 benefit from a coordinated turn....Coordinated turns mean a mix of Rudder and Aileron....The Rudder helps point the nose in the direction you want to turn, thus making the the turn rate faster...Some planes, without the addition of rudder suffer from adverse yaw...the SW1900 is one of them, the Volantex Ranger is another one, even worse in fact....
Adverse Yaw, is when the plane banks over with Aileron input, but yaws in the opposite direction to the (aileron) control input..model flies tail down and is reluctant to turn...
  Sometimes fixed by using differential Aileron movement, sometimes and more usually by addition of Rudder input....

:vulture:

[elmattbo]

Yeah I know that - it's caused by increased drag on the down going aileron as it creates more lift. But what you guys are describing is an uncoordinated turn with too much rudder. Once you've established the bank angle both rudder and ailerons should be neutral but with just a little back pressure to maintain attitude in the turn. No big deal if that how you want to fly it, but once in the turn the storm should  fly ok with just aileron and elevator. It'll be just a little untidy as it rolls in and rolls out!


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[Loopdreams]

Admittedly it's been a while but when I was having full size flying lessons I'm pretty sure that I needed to use the rudder all the way through the turn to keep it coordinated.

[elmattbo]

In all honesty, it's hard to tell. There's a number of forces at work related to difference in airspeed in the wings, dihedral, CoG... In a real aircraft it's easier to pick up and you just hold the attitude and 'step on the ball' as needed. You don't have that kind of info in RC flight, so just do whatever works. Either way, the storm should work fine!


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