ultramarin marine translations
ultramarin.online
nl achterloodlijn   loodrechte lijn door het snijpunt van de waterlijn (constructielaadlijn) en de achterzijde van het roer- of achtersteven, of van de middellijn van de roerschacht in plaats van de roer- of achtersteven;
de hinteres Lot
hintere Vertikale
hintere Senkrechte		 Senkrechte durch den Schnittpunkt von Konstruktionswasserlinie und der Hinterkante des Ruder- oder Achterstevens, bzw. der Mittellinie des Ruderschafts anstelle des Ruder- oder Achterstevens.
en aft(er) perpendicular
AP		 a vertical line at the intersection of the designed waterline (DWL) and the after side of the rudder post or sternpost, or the centerline of the rudder stock if there is no rudder post or sternpost;
fr perpendiculaire arrière
PPAR		  
es perpendicular de popa      
it perpendicolare addietro      
dk agterste perpendikulær      
         
     
   
 
  achterloodlijn hinteres Lot after perpendicular perpendiculaire arrière perpendicular de popa perpendicolare addietro
  voorloodlijn vorderes Lot forward perpendicular perpendiculaire avant perpendicular de proa perpendicolare avanti
 
en In ships possessing a well-defined rudder post, the vertical line through the intersection of the designed waterline with the after side of the straight portion of the rudder post is known as an after perpendicular (AP).
For both naval and commercial ships having their stern counters well submerged to form the so called cruiser stern, it is usual to set up the after perpendicular at the intersection of the designed waterline and the after side of the stern contour.
In ships with an overhanging merchant type stern, i.e., a vertical rudder post and an overhanging counter above the designed waterline, the after perpendicular by classification rules is identical with that at the after end of the designed waterline. Since the forward perpendicular by classification rules is identical with that at the forward end of the designed waterline, in vessels of this type the length on the designed waterline is identical with the length for classification purposes, and the term length between perpendiculars (LPP), is used without qualification.
In a vessel with no well-defined rudder post the after perpendicular by the rules of the classification societies is taken at the centerline of the rudder stock.		  
 
source: Principles of Naval Architecture