Thx EMIT for the link.
Thx hvogt too for the answer.
Am I understanding right ?
Putting it simple :
VASIS will get the wheels of my a/c at the same dist. from GND as for a shorter a/c due to the different pos of the lights ALONG the long. axis of the RWY ( this is, creating PARALLEL glideslopes ). therefore, one g/s for the cockpit, and one for the wheels. Bringing them right on 50´HAT, just like a shorter fuselage would follow.
Whereas PAPI, due to its ACROSS pos. to the RWY´s long. axis, creates CONVERGENT, i.e., DIFFERENT DEGREEE G/S´ . Therefore, following 3W´s - 1 R will only bring the a/c in a steeper desc. but the wheels to a height equal to the lower g/s on the VASIS if followed.
Shouldn´t I be intersecting the whites and reds in my way down in order to follow the ILS down to 200´ ?
( And I thought this was gonna be quickly sorted out..... )
Thx you all for the patience.
Rgrds.