File:Thrust blocks at the Science Museum.jpg
Original file (2,592 × 1,944 pixels, file size: 1.82 MB, MIME type: image/jpeg)
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Summary
[edit]DescriptionThrust blocks at the Science Museum.jpg |
Thrust blocks at the Science Museum. Thrust blocks are a specialised form of thrust bearing used in ships, to resist the thrust of the propellor shaft and transmit it to the hull. The large horseshoe thrust block represents a set of Michell thrust pads, as fitted to the 1,000 ton cargo steamship SS Orchy in 1930. These were removed after seven years' service and 227,000 miles. The ship had a single triple-expansion steam engine of 1,500 ihp and made 13 knots on trial. The effective outside diameter of the pads is just under 24". The single large gold-coloured pad is a wooden model of one of the pads fitted to HMS Hood. The ship had four screws, each with a single thrust block using twelve of these pads, six used for going forward, six astern. Each pad was made of bronze, but faced with white metal on the shaft side. The rear face was made spherical, to allow the pad to tilt according to Michell's principles for a wedge-shaped lubricant film. Each shaft was 24" in diameter and ran at 210 rpm to transmit 36,000 shp, giving rise to a force of 17 tons on each pad. |
Date | 5 April 2008, 13:03:36 (according to Exif data) |
Source | Own work |
Author | Andy Dingley |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 17:44, 7 October 2008 | 2,592 × 1,944 (1.82 MB) | Andy Dingley (talk | contribs) | {{Information |Description=en:Thrust blocks at the en:Science Museum |Source=Own work by uploader |Date=5/4/2008 |Author=Andy Dingley }} <!--{{ImageUpload|basic}}--> |
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Metadata
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Camera manufacturer | Canon |
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Camera model | Canon DIGITAL IXUS 500 |
Exposure time | 1/10 sec (0.1) |
F-number | f/2.8 |
Date and time of data generation | 13:03, 5 April 2008 |
Lens focal length | 7.40625 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
File change date and time | 13:03, 5 April 2008 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 13:03, 5 April 2008 |
Image compression mode | 5 |
APEX shutter speed | 3.3125 |
APEX aperture | 2.96875 |
APEX exposure bias | 0 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Color space | sRGB |
Focal plane X resolution | 9,159.0106007067 |
Focal plane Y resolution | 9,169.8113207547 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |