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The monochromator has been opened during the September shutdown for replacement of the old LN2 delivery hoses with new low turbulence hoses.
Aldi Old Street Shoreditch London Organic Prosecco £6.49 So Annoying when they do not remove the security tag
6 January 2025, the final day before the Tujisaidie School re-opened for the new school year. All the work had to be finished that day -- and it was!
Image 10 of 10 - Removing port Z-drive (a type of azimuth thruster) from riverboat "American Melody" before replacing it, Louisville, Kentucky, Ohio River mile 604, July 11, 2025
Closeup of the second (trailing) propeller. It's nice and clean for now, but soon it will meet that sweet brown water.
The boat is owned by American Cruise Lines, Guilford, Connecticut, which offers "small ship" cruises on the Mississippi River system, Columbia and Snake Rivers, and the waters of New England, Puget Sound, Alaska and the southeast U.S.
I was told that the boat will be offering cruises on the Ohio River between Louisville and Pittsburgh through early fall, then move to the lower Mississippi River.
The port Z-drive is not functioning correctly so it is being removed from the stern of "American Melody" before being replaced with a new one. It is a Veth Z-drive with counter-rotating (CR) propellers. Z-drives have also been referred to as rudder propellers since the direction of thrust is controlled by slewing the propellers themselves rather than using separate rudder(s) to deflect the thrust of a fixed propeller. Some Z-drives are ducted, with nozzles surrounding the propellers, but this one is open.
Veth Propulsion is a Dutch propulsion manufacturer, now part of Twin Disc, Inc.
From "Veth Rudder Propellers" (PDF):
"Operation: The CR unit consists of two propellers rotating in opposite directions relative to each other, wherein the second propeller removes the whirling of the water caused by the first propeller. This results in minimal rotational losses with optimal efficiency from the available power and propeller diameters.
Low noise: The counter-rotating propellers give a new dimension to efficient and low-noise propulsion. Because the optimum engine speed is more than 20% lower in contra-rotating propellers than in a single-propeller or in which two propellers rotate in the same direction, there is also an extremely low noise level. Also, the low blade load and the reduced turbulence in the water contribute to lower vibration and noise production.
Benefits: In contrast to other suppliers, Veth Propulsion offers a CR solution in which the propeller is mounted on two sides of the tail unit. This has a number of advantages:
- The peripheral speed of the shaft seals is half that of systems with two propellers on one side, in that a shaft does not rotate inside another shaft.
- Two separate (solid) shafts are each loaded between 45 - 55% of the output power
- A durable bearing and seal are thus created, compared with two propellers on one side
- By making use of a four-blade and a five-blade propeller, the power is distributed over nine blades
- Less time in dock during dismantling. Seals remain in position when the propeller is removed and oil change is not necessary
- At an equal propeller diameter, an efficiency gain of 15 to 20% is achieved compared to a single propeller"
"American Melody"
Year of build: 2021
Flag state: USA
Builder: Chesapeake Shipbuilding (Salisbury, Maryland USA)
Class: modern riverboat
Building cost: $30 million
Speed: 12 knots (14 mph)
Length (LOA): 269 feet [shipbuildinghistory says 302 feet]
Beam (width): 56 ft
Passengers: 175
Crew: 43
Decks: 5
Cabins: 91
Decks with cabins: 4
Sister-ships: (ACL American) Song, Harmony, Jazz, Symphony, Serenade, Encore, Anthem
Owner: American Cruise Lines Inc
Operator: American Cruise Lines
I cannot find engine specs for this boat, but her sister boat "American Song" is propelled by two "ultra-low-sulfur" Caterpillar diesel engines connected to Twin Disc Veth Propulsion Z-drives (Model VZ-1250A-CR) which can be rotated 360 degrees. Power output is 1,350 kilowatts (1810 horsepower) at 1,600 RPM. Extra maneuverability is provided by two Veth Propulsion tunnel thrusters (Model VT-400) producing 400 kilowatts (540 horsepower) at 1,500 RPM.
If you're really interested, see a list of models of Veth azimuth thrusters.
Ohio River mile 604
July 11, 2025
no file number
Taken with the average-at-best camera in my Jitterbug phone
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Workers from Landbridge Ecological remove buckthorn and other invasive trees from Columbia Park. They're using a controlled burn to dispose of the plant material.
Yup! They even come out of their trademark package so they can play. Hooray for the fries!
All creatures in moons_creations' flickr set are designed by M. Bridges and are protected by law, unless otherwise noted. ™ & © 2008 M. Bridges
Ian's sons Maitland and Casper expertly preparing the cups under Oop North's (Tim) and Mrboots2u's (Martin) gimlet attention.
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The spine cloth should be completely cut and removed from the book, as seen above. If the title is in good condition, keep the strip for uses demonstrated in later steps.
The molds are red hot and moved from the kiln to the sand pit. The person responsible for doing this has on extra protection because portions of their body actually enter the kiln, which is super hot.
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