A buddy of mine does this. Drives me nuts. He'll sit and screw with
the throttle to get 90 knots ground speed. I want to reach over there
and smack him upside the head. He makes himself so busy trying to fly a
certain groundspeed and he can't see that.

does your friend fly a groundspeed or fly the plane? I know the plane
flies through the air and doesn't know which way the ground goes
(up/down/left/right/forward/backward). If he is doing an
circle-to-land approach say in a 152 with 50 knot tail wind, does
he really have a IAS of 20 knots (or whatever a 152 does an approach
at). If so, his ground speed might be zero knots when he stalls.

Gerald