INSTRUCTOR PLT AND STUDENT LOSE CONTROL OF PA28 SHORTLY AFTER LIFT OFF WHILE PERFORMING A SIMULATED SOFT FIELD TKOF.

Narrative

A TKOF WAS INITIATED WHILE I WAS INSTRUCTING A STUDENT. THE ACFT WAS CONFIGURED FOR A SOFT-FIELD TKOF WITH FLAPS 25 DEGS AS CALLED FOR IN THE SYLLABUS. A NORMAL CLRNC TO TKOF RWY 22L WAS RECEIVED AND THE ACFT WAS TAXIED ONTO THE RWY WHILE COMPLETING THE SECOND PART BEFORE TKOF CHKLIST. A REF TO THE WINDSOCK INDICATED A L QUARTERING HEADWIND AND THE CALLOUT TKOF WAS PERFORMED AS THE THROTTLE WAS SMOOTHLY ADVANCED TO FULL. ENG PWR OUTPUT WAS NORMAL AND THE ACFT ACCELERATED AS EXPECTED. AS SPD BUILT; THE NOSEWHEEL LEFT THE GND AS EXPECTED. SHORTLY AFTER; THE ACFT BEGAN TO YAW L AND BECOME AIRBORNE INTO GND EFFECT. I COACHED THE STUDENT TO INCREASE R RUDDER BY REPEATING INTO THE INTERCOM R RUDDER. AT THAT POINT; THE ACFT BANKED TO THE R AND BEGAN SETTLING BACK TOWARD THE RWY MOVING TOWARD THE R SIDE OF THE RWY. CTL OF THE ACFT THEN WENT TO ME. I ATTEMPTED TO MAINTAIN POSITIVE CTL OF THE ACFT BY MANAGING THE ANGLE OF ATTACK THROUGHOUT THE SUBSEQUENT BOUNCES (ATTEMPTING TO MAKE GND CONTACT WITH ONLY THE MAIN GEAR) AND RECOVER DIRECTIONAL CTL; HOWEVER; THE AIRSPD WAS TOO LOW FOR SUSTAINED FLT EVEN IN GND EFFECT. I ATTEMPTED ALSO TO AVOID; UNSUCCESSFULLY; VARIOUS ARPT SIGNS WHILE THE ACFT WAS MOVING OVER AND ALONG THE INFIELD BTWN RWY XXL AND RWY XXR. AS THE ACFT SETTLED OUT OF A RELATIVELY LOWER BOUNCE AND LATERAL DIRECTIONAL CTL WAS ACHIEVED; I FULLY CLOSED THE THROTTLE AND ROLLED THE AIRPLANE BACK ONTO THE RWY. I EXITED THE RWY AT TAXI SPD AT INTXN; RPTED CLR TO THE TWR AND WAS INSTRUCTED TO CONTACT GND. GND CTL INSTRUCTED THAT WE EXIT THE TXWY AT INTXN AND SHUT DOWN WHERE MAINT WAS WAITING. THE ACFT WAS SHUT DOWN; THE 3 OCCUPANTS (MYSELF INCLUDED) EXITED UNINJURED; AND THE ACFT WAS TOWED TO THE MAINT HANGAR.