Octura propeller size charts

• Octura props are supplied in 1/8 inch (1/8 inch, 3.18mm), 3/16 inch (3/16 inch, 4.78mm) or 1/4 inch (0.25 inch, 6.35mm).
• 1/4 inch props are in general too large for Electric use.
• 3/16 inch props can be used on a 4mm shaft if a thin walled brass or aluminium spacer is used.
• Prop sizing - first two digits represent the pitch e.g. in X4nn or 14nn props the pitch is 1.4 times the diameter
• all props are LH  (counter clockwise viewed from rear) unless there is a trailing R on the prop designation ( RH/ clockwise viewed from rear)
• 12 are low lift ideal for submerged drive
  X4 are medium lift general purpose props
  M4 are like X4 but with the ears removed to unload the prop
  Y are like X series but have 10% more pitch
  X5 are general all purpose med lift prop
  X6 are higher lift than X4 and suitable for surface/semi surface use
  14 are moderatley high lift for hydros and deep V's
  16 are high lift props for riggers and hydro's
  17 are the highest lift prop for riggers and outboards
  P7 are similar to 17 series but more rake and less lifti
  19 are high lift for riggers and hydro's
  V9 are moderate lift suitable for riggers, mono's and cat
  20 are moderatley high lift suitable for riggers
  21 are high lift for riggers and hydro's 22 are high lift surface drive only good straight line speed
  
• The pitch of a prop represents the distance that the prop would travel in a forwards direction when turned once - assuming that there is no slip - for calculations it is reasonable to assume a slip of up to 20%

P= also available in Plastic, A= Also available in Aluminium