Weird behaviou at rolling... Just before takeoff.
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same problem for me, also with no wind: https://www.youtube.com/watch?v=lKGjLDxfIkI&t=5s&ab_channel=PS4
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For me the effect kicks in at 70kt IAS and is usually to the left. No wind, stable takeoff roll with basically no rudder input, but suddenly at 70kt there is a hefty effect to the left.
Not an issue of weight&balance either (added copilot weight).
Do not see this behavior with any other aircraft so far. -
@SandyDee Exactly. I have now gone back and compared the no wind takeoff behavior in the present version with that of version 0.3. I found the takeoff ground roll is actually smoother in the present version and there is no sudden yaw if you rotate at 65 knots. However if rotation is delayed until reaching 70 knots then there is an abrupt yaw to the left that does not happen in version 0.3. In the earlier version the nose does tend to wonder to the left and to the right throughout the ground roll. In the present version right rudder is realistically required to keep on center but there is no tendency to wonder. I agree that touch and goes are a pleasure so what is this strange abrupt yaw on initial takeoff when lifting off above 65 knots???
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@sdvpilot You are right, the behavior is not realistic. I my opinion JF had reduced the rudder steering at higher ground speeds, to make “normal” takeoff smoother, but they are not able to handle the strange weathervaning effect of the sim. I prior Versions I always tried to trim Nose-Up, in the actual Version there is no need for. But I guess in a case of Takeoff abort you will be lost.
I know, other MOD creators are also fighting with this Sim effect. GotGravel with his small Bushplane wrote he found a way in the last version, but I never tested it out. -
@lennsch Thank you for your suggestion. I found that at max fuel and weight the tendency to yaw to the left on takeoff does not occur unless you hold the nose down until reaching speeds well above 70 knots. However very little right rudder is required to remain on center which is also not realistic. I'm guessing that Just Flight developers have tweaked settings as much as possible given the present limitations of the sim. Pitch stability in a climb also seems better at gross weight making it easier to trim for a constant rate of climb but there is still room for improvement. Never the less I do think that this is by far the best GA single engine prop aircraft available for MSFS and I really do enjoy flying it.
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Unlike many small GA aircraft, such as the Cessna C152 and C172, the Piper PA28 does not have springs on the nosewheel steering. The nosewheel is directly connected to the rudder pedals, and any rudder deflection you apply will also turn the nosewheel in that direction. During the takeoff roll some right rudder is needed to counteract the normal engine induced left yaw, but the nosewheel needs to remain as straight as possible to maintain the steering track on the runway centerline... This can make the rudder and nosewheel work against each other, especially at the higher ground speeds just before rotation. To minimize this cross controlling, and improve the centerline tracking during takeoff, try this technique used by the old tail dragger fighter pilots...
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Turn on Cockpit Tool Tips in MSFS so you can see the exact amount of rudder and elevator trim being set.
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Before beginning the takeoff roll set the Rudder Trim to 3.0 degrees right, and the Elevator Trim to about 2.0 degrees Up (depending on your loading). This will apply the correct amount of right rudder to counter the engine induced yaw during takeoff and climb out, without also turning the nosewheel.
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After leveling off at cruise altitude, return the Rudder Trim to 0.0 to eliminate any side slip and allow maximum cruise speed to be achieved.
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That could not be the reason, because at higher taxi speeds the nose wheel have much less impact and you have to be really slow to effectively turn the plane hard. Why should it suddenly gain so much traction after 70 knots? As Delta mentioned, seems to be a problem with sim at the moment and the PA has been impacted hard by it.
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