Mxsmanic writes:
gatt writes:
I was wondering what was absorbing the kinetic energy of the aircraft,
since normally a loss of altitude requires an increase in airspeed, if
nothing absorbs the energy.

Drag. In a slip you are sliding sideways through the air. This means
you are trying to push the side of the fuselage through the air. It
is not designed to be very aerodynamic going sideways, so when you do
this you will create all sorts of extra drag which the plane does not
normally have.

Chris