Section 1 General

101. Application

The requirements in this chapter apply to hull appendages necessary for satisfactory performing of the following functions : propulsion, steering, dynamic lift, etc., such appendages except for the rudder include rudder post, shaft brackets, foils. The requirements include structural strength of hull foundations for the above items, and for appended propulsion units such as waterjets.

102. Definitions

(1) Redundancy is the ability of a component or system to maintain or restore its function when one failure has occurred. Redundancy can be achieved for instance by installation of more units or alternative means for performing a function.

(2) Operational condition is operation within sea state/speed restrictions for which the strength of the craft has been approved.

(3) Dynamic lift is support of craft other than hydrostatic support.

103. Approval of plans and documents

1. The following plans are to be submitted for approval.

(1) Structure plan of rudder post

(2) Structure plan of shaft brackets

(3) Detail plan of waterjet components

(4) Detail plan of waterjet shaft and tunnel

(5) Structure plan of foil

(6) Detail plan of hull foundations supporting appendages

2. The plans are to give full details of scantlings and their arrangement as well as the data necessary for verifying scantling calculations. Material specifications, welding and particulars about heat treat- ment are also required.