RedactedNarrative: Operator v1 states as he was backing into slip A14 he lost power to his STBD engine, causing v1 to drift and strike v2 docked in slip A13 along its port bow with the STBD stern of v2. 
  
  V1 also struck a wooden piling causing it to break in half. V2  struck a floating dock astern as a result of the initial collision. Town of Hempstead notified of damage to piling.