Dipstick,

I forgot the name of the professor, but it was in Harvey Mudd College.

Most of the planes I have are tail dragger, except for my Delta Vortex (it's a tri, but it lands like a tail dragger, if you know what I mean). None of my current planes has much of the yaw-left effect during take-off, because all are so terribly over-powered that the tail reaches flying speed the moment I gun my left thumb. Even for my profile Edge w/ a very high sitting AOA, the transient pitch during take-off is so instanteous that there's not enough time to yaw. The only plane I ever had that I recall having difficulty taking off was a Sturdy Bird (like Dura Plane, except it was tail dragger).

Another factor that I think affect the take-off P-effect is the placement of the main gears. If the main wheels are way forward of the CG, that means it takes much more yaw torque to yaw the plane, than say if the main wheels are right on the CG. I think parallel axis theorem can quantify this. My profile Edge's wheels are like 35% chord-width forward of the LE.