stilton,
As I'm sure you know, it'll have drag even when it's not producing lift. If you stick a spoiler up on take-off it will increase the drag during the T/O roll.
Up until rotation (I would say) that it is not a 'lift producing jet propelled ground vehicle' (albeit some lift may be generated depending upon the ground attitude lifting surface incidence angle). I'd say it was pretty much all form drag on the pre-rotation ground roll.
Mobius :-)