SF technique in this aeroplane SHOULD be 2 stages of flap. Otherwise you are just adding drag and not improving climb performance much.
The later, and more powerful versions, of the PA28 do indeed specify 2-stages of flap for a short-field takeoff. However, I have never seen a Cherokee 140 flight manual specify this. The only performance figures I have seen for the Cherokee 140 are 0 degrees of flap for take-off. I would be interested if someone has a Cherokee 140 with performance figures in its flight manual for take-off with flap selected.
SF technique in this aeroplane SHOULD be 2 stages of flap. Otherwise you are just adding drag and not improving climb performance much.
Take off with 0 degree of flap does not add drag, but it may reduce lift at a given airspeed.