Plane barrel roll

ok heres what I'm looking at doing: when I press the left and right arrow keys together it makes the plane do a roll (360) with the wings rotating each other like they do in the movies, and what I am confused about is how to get it to roll only once and have it so that it will not affect the planes movement otherwise. Can anyone point some light on this issue?
edit:

heres what i have to test the rotation (using voice commands)

default
{
state_entry()
{
llListen(0, "", llGetOwner(), "";
}
listen(integer c, string n, key id, string m)
{
if(llToLower(m) == "sb"
{
llTargetOmega(<0,1,0>, PI, 1);
}
else if(llToLower(m) == "eb"
{
llTargetOmega(<0,0,0>, PI, 1);
}
}
}

problem is that when I have this script (using a diff script then the plane script) do the roll it rolls on a weird axis anyway to get it to roll constantly on the X axis?

Hi

If you have this in a chield prim it will rotate around its local axis rather than the rigonal axis,

Another problem you have is that llTargetOmega behaves slightly ddiferntly on physical objects compaired to none physical, none physical is esencialy a visual efect wile in physical it needs to update the movent to the simulater regulerly, no idea what efect it would have on a vehicle scripted object.

target omega probably isn't what you want for this... maybe apply rotational impulse?

so if the plane faces the x axis (the nose) I would apply the rotation how? And I tried target omega......didnt work to well...lol

I haven't played with the function before, but something like
llApplyRotationalImpulse( <2, .0, .0>, TRUE );
should be right...

I'm assuming that it rotates on the acces given in the vector, and that the amount is specified in radians... either assumption could be wrong as I can't find details.... so I used X since that's the axis you are aligned on, and 4 which is a lil more than pi so it'd rotate a lil more than 180 degrees and then should be autoleveled by the physics engine after.... well that's my theory anyways... play with it and let us know =)