http://www.geareddrives.com/faqs.htm#What_about_planetary_gears_in_a_PSRU__I_choose_to_use_the_best_for_safety_and_dependability_in_the_Geared_Drive._For_this_reason,_I_am_against_the_use_of_planetary_gears_in_a_PSRU._Consider_what_they_were_designed_for;_to_change_an_automatic_transmission_from_one_gear_and_into_another._They_were_designed_to_work_at_high_RPM_for_only_short_periods_of_service._They_are_very_small_and_turn_at_ultra_high_RPM_when_in_continuous_use,_and_from_twenty_plus_years_of_personal_experience_in_professional_auto_racing,_my_personal_opinion_is_that_there_is_any_way_that_planetary_gears_can_possibly_hold_up_long_term._The_strongest_and_most_dependable_kind_of_gear_is_a_straight_cut_spur,_which_is_what_I_chose_to_use_in_the_Geared_Drive_PSRU._1
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