RMF Non-Linear Penetration

• RMF penetration is strongly non-linear

when rs >> ? = (2?///?o?)1/2. Need

?* = (2?///?o?)1/2 > rs where ? = (?-?r).

• Penetration is only possible when

RMF torque TRMF ~ ??2(?/?)To exceeds

the resistive torque T? ~ (?r/?)To

for ?r??. (To = (? /2)? a4mene??)

• TRMF = T? ? ? ? ?/?2 and ?* ? ?? so

that one must have

? = ?ce/(???//)1/2 > ? ? rs/?

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