The need for right rudder during take-off is primarily from the airflow hitting the vertical stab. Right rudder is also required during take-off in a tricycle aircraft. This assumes that the engine turns clockwise when viewed from the cockpit. P-factor & torque also come into play during take-off. P-factor effects all aspects of flight, but is more pronounced in high angles of attack. I've been flying full scale for 20 something years. A good demonstration of p-factor is go into a climb, then take your feet of the rudder peddles. The nose of the plane will go to the left. Very quickly at that.

P-factor: During a climb, the ascending blade has a lesser angle of attack than the descending blade. RE: the ascending blade is taking a very little bite of air while the descending blade is taking a great big bite.

Joe