(Possibly) wrong deployment of slat in 109 F2 and 109 G4

[sergio_]

I started this (here:

 

Well, today I reproduced it just for the sake of it, so the fact that other users found a normal behavior does not mean there is no bug, just that for whatever reason they did not find it, which is Ok.

But since I can reproduce this at will, at this point I do believe there's something not right here. And while this doesn't seem to affect playability at all, and I don't feel any urgency, I've been suggested you guys are in the pursue of perfection, therefore my report, in case this is a bug and you want to check it out.

 

Assumption:

Wing slats can (and do) deploy assimetrycally in the right conditions. You can correlate this to AoA, but AoA is related to speed. You can get your wings have a different AoA and speed by turning and banking. You might expect the slat of the slower wing in a turn migh have a tendency to deploy before the faster wing. I found the 109 behaving as you might expect according to this assumption, except for the two models below.

 

1.- 109 F2

This model has the opposite behavior: it has a tendency to deploy the slat in the faster wing. I tested it for my original post, and I have just reproduced it today. Here you have it turning left and right:

F4: https://gyazo.com/f6fc1301b0f731817396cf485d95a051
F4: https://gyazo.com/95c7457399f80e375b04173560ee906d

 

2.- G4

Moreover, the reason I think there is a bug here is that the G4 behavior is yet more curious: if it deploys one single slat, it seems it can only be the right wing.

You could argue that maybe the ball is not centered, but as you can see in the picture, the rudder is pointing the nose leftwards, therefore the left wing is traveling slower than the right wing, yet it is the right wing the one with the slat deployed. Turn right, and you will also have the right slat deployed (again, when only one of them is). Again, first photos in my original post, one more taken today:

 G4 turning left: https://gyazo.com/bb7d4f72691633c6ef586008de77bd0d

 

It might be these two specific models have aerodynamic properties that make them behave like that, but I think there's enough reason for suspect here, given the similarity of all 109s.

 

Anyway, thanks for creating this beauty.

Best regards.

 

 

 

 

 

[AndyJWest]

2 minutes ago, sergio_ said:

...

2.- G4

...

You could argue that maybe the ball is not centered, but as you can see in the picture, the rudder is pointing the nose leftwards, therefore the left wing is traveling slower than the right wing, yet it is the right wing the one with the slat deployed...

 

 

You seem not to understand the effect of dihedral in relation to AoA and slip. It is primarily the angle of attack, not the airspeed, that determines when the slat deploys. Slip an aircraft with dihedral sideways, and the 'forward' wing increases its AoA. 

 

As for the rest of your comments, I'm sure I read somewhere or other that asymmetric deployment of Bf-109 slats wasn't unusual. Given how they worked, this isn't surprising. Simple manufacturing tolerances could account for much of it. And if it isn't having a significant effect on handling, why worry about it?

[sergio_]

Well all the 109s have dihedral, right? Are you ignoring those on purpose?

 

The fact that asymetric deployment was usual doesn add much to the fact that there are two models that behave different from the rest.

 

As for the "why worry about it" question, I'm not any worried, why do you worry about my report if you are sure there is no bug, and my reasons are clear enough. Any skins creator will gladly give you a few more, none of them related to playability