Flying Vehicle Datablock: Ascending

I've been playing around with flying vehicle physics attributes in specifically the Warsparrow datablock, trying to allow the vehicle to fly in any direction unhindered by gravity.

It seems when I'm pointing "Up", or away from the terrain, there is a drag keeping me from accellerating.

I've checked out the resources and documents detailing the datablock attributes, but I'm a bit confused as to which Angular/Liner whachamacallit corresponds to the vehicle's physics.

Does anyone know what I'm talking about? This verticle drag (gravity?) that is applied when I'm pointing the 'nose' of the vehicle up towards the sky.