- THE UPPER PART OF THE STERN OF A SHIP
EXTENDS ABAFT THE RUDDER POST, & THERE MUST BE A SPECIAL ARRANGEMENT
OF FRAMING TO SUPPORT IT.
- THIS FRAMING IS MAINLY CARRIED BY THE
‘TRANSOM’, WHICH CONSISTS OF A DEEP, HEAVY FLOOR, SECURELY ATTACHED TO THE
RUDDER POST, IN ASSOCIATION WITH A TRANSVERSE FRAME & BEAM. THESE ARE
KNOWN AS THE ‘TRANSOM FLOOR’ & ‘TRANSVERSE BEAM’.
- THE TRANSOM FLOOR MUST HAVE THE SAME
DEPTH AS THE FLOORS IN THE CELLULAR DB, BUT MUST BE SLIGHTLY THICKER.
- ORDINARY STERNS:
- THESE WERE OFTEN CALLED ‘COUNTER’, OR
‘ELLIPTICAL’ STERNS.
- INSTEAD OF THEM, CRUISER OR TRANSOM
STERNS ARE USED.
- CRUISER STERNS:
- THEY HAVEA SYSTEM OF ORDINARY TRANSVERSE
FRAMING WHICH IS SUPPORTED BY AN INTERCOASTAL GIRDER AT THE CENTRE LINE.
- THE GIRDER HAS TO BE DOUBLED, JUST ABAFT
THE TRANSOM FLOOR, TO ALLOW THE RUDDER STOCK TO PASS.
- A NUMBER OF CANT FRAMES ARE FITTED ABAFT
THE AFTERMOST TRANSVERSE FRAME.
- THE FRAMES ARE TO BE OF THE SAME SIZE AS
BULB ANGLE FRAMES IN PEAKS & ARE TO EXTEND TO THE STRENGTH DECK.
- THE FRAME SPACING IS NOT TO EXCEED 610
mm.
- WHERE EXTRA STRENGTH IS REQUIRED, WEB
FRAMES MAY BE REQUIRED & ALSO EXTRA LONGITUDINAL GIRDERS TO SUPPORT
THEM.
TRANSOM STERN:
- THIS IS SIMILAR TO A CRUISER STERN,
EXCEPT THAT THE CANT FRAMING AT THE AFTER END IS OMMITED & IS REPLACED
BY A FLAT PLATE, CALLED A TRANSOM.
RUDDER
TRUNK
- THIS IS OFTEN FORMED BY CARRYING -UP THE
DOUBLED CENTRE GIRDER TO THE DECK ABOVE IN THE FORM OF A BOX.
No comments:
Post a Comment