F-82 roll axis question

[BarnOwlLover]

Since last night I've been trying to figure out how the roll axis of the F-82 works. Does it roll about the fuselage where the control inputs are being applied, or does it roll about the center of the wing as if it has a central fuselage? And what type of roll was consistent of twin fuselage aircraft?

 

[Thumpalumpacus]

I'm pretty sure it's going to roll about the central axis at the midpoint of the wing. Asymmetric roll is probably pretty dangerous, though I'm no pilot.

 

[special ed]

Next, you can think about the roll axis of the Bv 141.

 

[GregP]

I've read pilot reports from the P-82 that say, to the pilot it felt as though it was rolling around him and, to the navigator / radar operator ikt felt as though it was rolling around him.

To me, that says the actual roll axis was in the middle, as you'd expect with equal aileron deflection during a roll.

 

[BarnOwlLover]

From what I can tell in videos of the XP-82 flying, it does seem to roll/bank symmetrically, as per having the controls rigged conventionally, and not about one fuselage or the other.

 

[Thumpalumpacus]

From what I can tell in videos of the XP-82 flying, it does seem to roll/bank symmetrically, as per having the controls rigged conventionally, and not about one fuselage or the other.

The physics pretty much dictates it, if the weight is symmetrical and the control surfaces are as well. Of course, the weight may not be symmetrical depending on fuel stowage and consumption.

But the C/G is not bound to the airframe itself, it can and probably was between the two fuselages. Not speaking about this plane in particular, but it could be a spot not inside the airframe at all. It will also change depending on maneuvers. C/G is not a static spot, especially when you're pulling Gs.

If the weight or aerodynamics aren't symmetrical, you've got a little more thinking to do.

 

[fubar57]

Maybe remove the nose armour.......and I'm outta here..................

 

[Thumpalumpacus]

Maybe remove the nose armour.......and I'm outta here..................

Nose-first, I'm assuming ...

 

[GrauGeist]

Nose-first, I'm assuming ...

Nose-first, unless he's being tossed out, then he may land on his IFF...

 

[Thumpalumpacus]

Nose-first, unless he's being tossed out, then he may land on his IFF...

... and he ain't radioing for help.