▁Second ▁production ▁model , ▁power ed ▁by ▁two ▁ ▁R - 3 3 5 0 - 2 4 W ▁engines ▁driving ▁and ▁three - bl aded ▁prop ellers . ▁N ose ▁tur ret ▁replaced ▁by ▁" att ack " ▁nose ▁fitted ▁with ▁six ▁fixed ▁ 2 0 ▁mm ▁can non . ▁First ▁eight ▁aircraft ▁retained ▁Bell ▁tail ▁tur ret ▁fitted ▁with ▁tw in ▁. 5 0 ▁machine ▁guns , ▁with ▁remaining ▁aircraft ▁using ▁Em erson ▁tail ▁tur ret ▁with ▁tw in ▁ 2 0 ▁mm ▁can non . ▁ 8 0 ▁built . ▁P 2 V - 2 N ▁" Pol ar ▁Bear " ▁Two ▁P 2 V - 2 ▁modified ▁for ▁polar ▁expl oration ▁under ▁Project ▁Ski ▁J ump . ▁Arm ament ▁removed , ▁with ▁ski ▁landing ▁g ear ▁and ▁provision ▁for ▁J AT O ▁rock ets . ▁F itted ▁with ▁early ▁M AD ▁g ear ▁for ▁magnetic ▁survey ▁purposes . ▁U sed ▁for ▁Operation ▁Deep ▁Free ze ▁Ant ar ctic ▁expl oration . ▁The ▁spe cially ▁modified ▁P 2 V s ▁had ▁ 1 6 - foot ▁long ▁al umin um ▁sk is ▁that ▁were ▁attached ▁to ▁the ▁main ▁landing ▁g ear ▁units ▁that ▁when ▁ret ract ed , ▁t uck ed ▁into ▁fair ing ▁just ▁below ▁the ▁engines . ▁This ▁way ▁the ▁modified ▁P 2 V s ▁could ▁still ▁land ▁on ▁a ▁regular ▁run way ▁surface . ▁P 2 V - 2 S ▁One ▁P 2 V - 2 ▁modified ▁as ▁a ▁prototype ▁anti - sub marine ▁variant ▁with ▁an