PREFACE| SPECIFICATION| MIDDENDORF| SUMMARY| CALCULATION| CONSTRUCTION| TRUSS & PARRAL| STAD A'DAM| CONCLUSION

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    The drawings below are of the winches of the clipper ship Stad Amsterdam, which were kindly sent to me by Capt. Pieter Brantjes.
A number of issues stand out clearly. It appears the winch has a high and a low drive, for fast 'empty' and for slower 'full' bracing.
In these drawings not all the drums do make the same number of revolutions. The lower yard drum is mounted on a shaft with a gear wheel with 40 cogs. Both the topsail yard drums have gear wheels with 50 cogs. This means that if the shaft of the lower yard has made 5 revolutions, the other shafts have made precisely 4 revolutions.
A ratio like this can be included in the spreadsheet. Suppose it takes 36 revolutions for the lower yard to be braced around, then the drums of the topsail yards have to make 36 x 4/5 = 28,8 revolutions to come about completely.
By studying the pictures carefully a lot of qualities about the operation of the winch are being declared.


Move the cursor over the figures to read the part names


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6" x 3 ½'' steel angle base 6'' x 3½'' steel angle base Steel stay rods at base - 1'' diameter pipe on '' diameter bolt Steel stays - 1'' diameter Lower topsail yard brace, port side Jib head keys Bar to receive wire brace Lower topsail yard brace, starboard side Steel stays - 1'' diameter Spur gear (50 teeth) for outer cones Holding down bolts to deck Driving spindle squared at ends to receive handle Slipper to fit cavity in outside face of spur gear Brake band Spur gear driven by item 22 Small spur gear on driving shaft Lower yard brace, port side Counter shaft supports of steel plate and stiffening to item 6 6'' x 3½'' steel angle base Lower yard brace, starboard side Spur gear on driving shaft for high gear mode Holding down bolts to deck Slipper to fit cavity in outside face of spur gear Driving spindle squared at ends to receive handle Spur gear on counter shaft, transmitting drive from item 21 Counter shaft supports of steel plate and stiffening to item 6 Steel spacers - 1'' diameter pipe on ½'' diameter bolt 2'' x 2'' x ¼'' steel angle frame Timber base Brake handle Retaining guard and gate for main gears Spur gear on counter shaft, driven by item 20 Counter shaft - fixed in position Counter shaft supports of steel plate and stiffening to item 6 Counter shaft bracket Steel stays - 1'' diameter First turn of wire brace seized here Spur gear (40 teeth) driven by item 17 when in high gear mode or transmitting through shaft from item 23 Spur gear (50 teeth) for outer cones 2'' x 2'' x ¼'' steel angle frame Timber base Timber base First turn of wire brace seized here Jib head keys Upper topsail yard brace, starboard side Steel stay rods at base - 1'' diameter pipe on ½'' diameter bolt Upper topsail yard brace, port side Bar to receive wire brace Driving spindle squared at ends to receive handle Counter shaft bracket Cone shaft bearing block of cast iron Jib head keys Slipper to fit cavity in outside face of spur gear Bracket to carry locking shoe 'Slipper' Timber base Steel stays - 1'' diameter Brake band Stop collar for limiting movement of driving shaft Retaining guard and gate for main gears Spur gear on counter shaft, transmitting drive from item 21 Spur gear on counter shaft, driven by item 20 Spur gear driven by item 22 Jib head keys Bar to receive wire brace Pair of toggles to support brake Anchor for brake gear toggles Holding down bolts to deck Steel spacers - 1'' diameter pipe on ½'' diameter bolt First turn of wire brace seized here Timber base Timber base 6'' x 3½'' steel angle base 6'' x 3½'' steel angle base 2'' x 2'' x ¼'' steel angle frame 2'' x 2'' x ¼'' steel angle frame Steel stay rods at base - 1'' diameter pipe on ½'' diameter bolt First turn of wire brace seized here 2'' x 2'' x ¼'' steel angle frame Counter shaft bracket Steel stays - 1'' diameter Jib head keys Counter shaft - fixed in position Bar to receive wire brace Spur gear (50 teeth) for outer cones Spur gear (40 teeth) driven by item 17 when in high gear mode or transmitting through shaft from item 23 Bracket to carry locking shoe 'Slipper' Slipper to fit cavity in outside face of spur gear Cone shaft bearing block of cast iron Locking pin to secure 'Slipper' Steel stays - 1'' diameter Spur gear on driving shaft for high gear mode Retaining guard for gear train, high gear mode Driving spindle squared at ends to receive handle Counter shaft supports of steel plate and stiffening to item 6 Small spur gear on driving shaft Spur gear on counter shaft, driven by item 20 Spur gear on counter shaft, transmitting drive from item 21 Counter shaft - fixed in position Brake handle Harwood wedge to secure cone bars Bar of cast iron Brake band Pair of toggles to support brake Lower topsail yard brace, starboard side Coned drum with 7 bars for wire brace Steel spacers - 1'' diameter pipe on ½'' diameter bolt Steel spacers - 1'' diameter pipe on ½'' diameter bolt Steel spacers - 1'' diameter pipe on ½'' diameter bolt Steel spacers - 1'' diameter pipe on ½'' diameter bolt Lower topsail yard brace, port side Steel stay rods at base - 1'' diameter pipe on '' diameter bolt Cone shaft bearing block of cast iron Cranked handle to fit drive shaft at item 7 Cranked handle to fit drive shaft at item 7 Steel stay rods at base - 1'' diameter pipe on '' diameter bolt Steel stays - 1'' diameter Lower yard brace, port side 6'' x 3½ '' steel angle base 6'' x 3½'' steel angle base Driving spindle squared at ends to receive handle Spur gear driven by item 22 Coned drum with 7 bars for wire brace Brake drum carrying brake band Coned drum with 9 bars for wire brace Lower yard brace, starboard side Upper topsail yard brace, starboard side Retaining guard and gate for main gears Brake band Brake drum carrying brake band Upper topsail yard brace, port side Brake handle Coned drum with 9 bars for wire brace Counter shaft supports of steel plate and stiffening to item 6 Brake band Slipper to fit cavity in outside face of spur gear Pair of toggles to support brake Timber base Timber base Holding down bolts to deck Holding down bolts to deck Steel stay rods at base - 1'' diameter pipe on '' diameter bolt 2'' x 2'' x ¼'' steel angle frame Cone shaft bearing block of cast iron Bar of cast iron Harwood wedge to secure cone bars Spur gear (50 teeth) for outer cones Spur gear (50 teeth) for outer cones Spur gear (40 teeth) driven by item 17 when in high gear mode or transmitting through shaft from item 23 Cone shaft bearing block of cast iron 2'' x 2'' x ¼'' steel angle frame Steel stays - 1'' diameter Upper topsail yard brace, port side Upper topsail yard brace, starboard side Lower yard brace, starboard side Steel stays - 1'' diameter Lower yard brace, port side Lower topsail yard brace, starboard side Lower topsail yard brace, port side Retaining guard for gear train, high gear mode Cone shaft bearing block of cast iron Steel stay rods at base - 1'' diameter pipe on ½'' diameter bolt Bracket to carry locking shoe 'Slipper' Driving spindle squared at ends to receive handle Drive shaft bearing block of cast iron Slipper to fit cavity in outside face of spur gear Spur gear (50 teeth) for outer cones Spur gear (50 teeth) for outer cones Spur gear (40 teeth) driven by item 17 when in high gear mode or transmitting through shaft from item 23 Spur gear on driving shaft for high gear mode