I have problem with JF Pa-28 Arrow III at take off and landing.
During taxi everything is fine, once I incrase throttle to about 85-95% for take off, aircraft goes hard to right, I need to apply almost full rudder to counter it. When I add rudder, than ‘‘force’’ which pushed me to right, pushes mo to left, but it happens so sudden that aircraft goes hard to left, even rudder is almost full right. If I release rudder, aircraft start to ‘‘dance’’ and it is very, VERY hard to control it, so it goes off runway. Sometimes I manage to control it so I keep it close to runway center, but it swivel left-right. Once in air, force disappear and no more need for rudder. Only some torque force is present but nothing big which I can’t control.
Similar is happening when I land, moment when wheels touch runway ‘‘force’’ appears and again dancing begins untill speed drops bellow 20-30 knots.
I know there is torque force which have tendency to spin aircraft but so far I know it is more noticable once aircraft is in air than at ground.
It happens no matter of wind, high or low, direction also doesn’t matter, crosswind or headwind.
Aircraft is up to date, bought it at FS marketplace. Other aircrafts acts normal, so it is not up to my PC or HOTAS if it is, it would be same for other aircrafts.
Trim nose up for take-off, if you are flying at the default loading, the CG is towards the front of the allowed range. With both front seats occupied, our testers gave a trim position in real life somewhere in the aft half of the trim range (from memory, it was something like 9 turns forwards, 18 turns back to check full movement and then about 6 or 7 forwards from fully aft?) Something in the ground handling is odd when pressure is put on the nose wheel, and I haven’t been able to work out why.
Also check you are using the linear curves suggested and shown (screenshot) in multiple threads both here and on the JF forum. It will only fly how it is intended to if you use the same curves / sensitivities / dead ones it was developed with.
It only really occurs with a strong enough crosswind. If the wind is directly on the nose no wobble is felt, no matter how long you leave it before rotating. There are a lot of threads on this, regarding crosswind, and static friction.
It just so happens that the Arrow suffers more from this than any other plane I fly. The Islander, by comparison, is far more stable on take-off roll, even with a stiff crosswind.
Could you be more precise?
The issue others described does not kick in immediately when pushing the throttle but at around 60kt IAS shortly before you’d pull to rotate.
The way you describe it sounds like it’s a different issue if it happens immediately even at very slow speed and might really be crosswind.
Yes, it is around rotation speed that it occurs. A video I shot before, for a related issue, showed that the crosswind was at maximum strength around 70kts, but the wobbles I felt from gusts were lower than that, closer to 41kts I think, but that was more down to an issue with Asobos implementation of gusts, which if I remember right doesn’t even exist in live weather but only occurs with manually configured weather.
Take off without gusts
Take off with gusts
In the non-gusty video you can see the nose wheel twitch come in around 75-76kts.
I had a flight today slight wind from the left but still it had a tendency to roll left. I had a same sized copilot with me and used the left tank first so I can’t really understand it especially as I was levelled out and taking it easy … VFR no auto pilot
If trim is not positioned back as @GrimPhoenix9349 suggested, it will happen wind or no wind. But you are correct it’s even worse with a crosswind. Which makes some sense, since, if the tire friction suddenly goes to zero, and the wind suddenly takes affect, it stands to reason a sudden wild swing will ensue.
Pull back on the elevator trim a bit, and, as @FlyMe2Dunoon suggested, start to pull up slightly to get the nosewheel up at around 60 - 65 knots. After a few tries, you’ll find the correct trim position for takeoff.
TBH, even when I fly the Warriors I rent, it really does perform better with a little up elevator trim on takeoff. If I forget, it can be hard to get it off the ground. I don’t get the wild swings, obviously, but, Asobo seems to think this is due to their tire friction model, on/off and all that.
In real life, there’s plenty of times I’ve been flying along and a gust comes along and tries to flip me over, IOW, induces a sudden roll. It’s kind of a bummer when it happens when you’re looking down and focused on changing frequencies. Wah!
Some of my earliest flights last August were around the Grand Canyon. If you fly parallel to the canyon walls, you can decide whether you want to experience a down draft, or up draft. There is a very pronounced roll felt. I may be remembering this wrong, but it felt sufficiently nuanced that I could decide which wing it would strike, and anticipate which way the plane would roll.
Coming from X-Plane, that just about knocked my socks off!