A B C D E F G H I J K L M N O P Q R S T U V W

 

Mainsail

The big sail attached to the back of the mast

Mainsheet

The rope that controls the mainsail, see sheet.

Martin breaker

Strop used to release the spinnaker from the guy in heavy weather. As it is often too dangerous to go forward and to the end of the spinnaker pole to release a spinnaker when you want to drop it, the Martin breaker is attached between the snap shackle attaching the guy or brace to the spinnaker and the spinnaker pole. The Martin breaker goes over the snap shackle so that any load will trip the trigger and release the sail. When the guy is eased normally the pole will follow the sail and the Martin breaker won't release the snap shackle. If the guy is eased suddenly, however, the action of the breaker trips the shackle.

Mast

Spar on which the sails are hoisted. On Volvo Open 70s, made from carbon.

Mastman

Crew member who is responsible for helping the bowman with things like the mast end of the spinnaker pole and with bumping halyards when hoisting sails. Generally also to be found on the grinder handles when trimming is happening.

Masthead sail

Sails that are hoisted to the top of the mast.

Meteorology

Study of weather forecasting - 'Met Office' is short for 'Meteorological Office'.

Monster

A large, heavy and ungainly sail.