Neptune Windvane Models

A sailboat under way at sunset using a Neptune self steering windvane
The sizing of the different Neptune self steering windvane models
ModelWeightYacht Length
M650 (mk2)16 kg23ft / 7m
M790 (mk2)17 kg31ft / 9.5m
M950 (mk2)18 kg40ft / 12m
M1070 (mk2)19 kg50ft / 15m

Power increases with the square of boat speed. Model numbers (650, 790, 950 and 1070) refer to the height in millimeters from the water line to the centre of the mounting boss, when the vessel is not underway. This measurement allows for 200mm of stern wave for the Neptune rudder to be at its optimum level in the water when underway. To convert these measurements to inches, divide by 25.4, i.e. the M650 requires a measurement of 25.6 inches.

A standard Neptune unit will be supplied with:-

Colour coded rudder and airfoil

  1. Course adjusting crank with the option of either the short model or the flexible, extension crank (500mm long)
  2. Operating, service and installation instructions
Detailed view of a Neptune self steering windvane
Detailed view of a Neptune self steering windvane