In a PA28 the flaps can be reset v quickly
because of the direct mechanical link so the
flap setting is a given
With a C150/2/72 with 40 degrees flap it takes about 5 seconds to retract and its difficult in some variants to select say 10 degrees quickly. So its difficult to be sure what you have in the way of flap setting in the transition
Nevertheless I have always taught the power first technique, retract drag flap initially
then the remaining flap at 200 ' The
CAA examiner seemed happy with this
A jet engine takes a few seconds to spool up
so applying power first is important and
would have been close to the examiners heart
I guess!