However is it not true that perception of airspeed WITHOUT a indicator
other
than ones eye is very difficult when standing on the ground than it is at
any other time???

Yes, and that is what I was hinting at.

Yet, if the pilot does not reduce throttle, or gain altitude during the
turn, and makes the turn just like he always turns (probably true in most
cases) then there would be no reason to be slowing down, no matter what he
observed with the airspeed.

It is a nice way to cover saying (or not to say) I screwed the pooch, to the
uninformed!
--
Jim in NC