Stadt Frankfurt (1827)
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Stadt Frankfurt in Basel on 28 July 1832 | |
| History | |
|---|---|
| Name | Stadt Frankfurt |
| Namesake | Frankfurt |
| Owner | Dampfschiffahrts-Gesellschaft von Rhein und Main |
| Builder | NSM's shipyard in IJsselmonde[1] |
| Cost | 102,000 guilders[2] |
| Launched | August 1827[1] |
| Commissioned | 8 March 1828 |
| History | |
| Name | Stadt Frankfurt |
| Owner | Preußisch-Rheinische Dampfschiffahrts-Gesellschaft |
| Acquired | 1832 |
| Fate | Broken up 1840 |
| General characteristics | |
| Type | Paddle steamboat |
| Length | 28.5 m[3] |
| Beam | 5.7 m[3] |
| Draught | 0.48 m[3] |
| Installed power | 30 hp (22 kW)[4] |
| Propulsion | 2 paddle wheels |
| Complement | 10[3] |
Stadt Frankfurt was the first steamboat on the Main and the first steamboat to steam up the Oberrhein to Basel, Switzerland in 1832.
In 1825, a company was founded in Baden to introduce regular service with steamboats on the Upper Rhine. In October 1825, it ordered three steamboats at the Nederlandsche Stoomboot Maatschappij (NSM).[5] In 1826, the company fused with a company from Frankfurt, Mainz and Strasbourg to form the Dampfschiffahrts-Gesellschaft von Rhein und Main (DGRM) with headquarters in Mainz. Its plan was to introduce a regular service on the Rhine between Mainz and Strasbourg, and on the Main between Mainz and Frankfurt.
Concordia was delivered first, but when she showed to be unsuitable for the projected service between Mainz and Mannheim, she was sold to the Preußisch-Rheinische Dampfschiffahrts-Gesellschaft (PRDG), which successfully used her between Cologne and Mainz. The next ship that was delivered was Ludwig, which had been planned for service between Mainz and Strasbourg. Stadt Frankfurt was the third ship ordered by DGRM. She was planned for use on the Main between Main and Frankfurt, and had been specially constructed to have a very shallow draft.
Boat characteristics
The order for Stadt Frankfurt went to the Nederlandsche Stoomboot Maatschappij. This had to do with NSM's steamboat De Rijn being the first to reach Strasbourg and Kehl in September 1825. As NSM had proven its capabilities, it got the order for the three DGRM boats.[5] The order included the boat for the shallow Main. Up until then, NSM had subcontracted others to build the hull of her steam vessels. E.g. Hogendijk in Cappelle aan de IJssel and somewhat later a shipyard in Alblasserdam. In November 1824 NSM established its own smithy. In May 1825 it then bought the shipyard of H. Blanken in Oost IJsselmonde. Here NSM erected a shear leg, crucial for lifting boilers.[6]
The hull of Stadt Frankfurt would be built on the NSM shipyard in Oost IJsselmonde.[5] During construction, the biggest challenge was to limit the draft of the boat, while making her strong enough to carry the machinery. During the construction of Willem de Eerste Fop Smit first applied a good solution for this problem.[7] It used iron bars that crossed and supported each other. NSM's shipyard Fijenoord would become an expert in this field after many costly experiments.[8]
The hull was described as being 100 by 32 feet with a draft of 16-17 Inch. This was much more than the size of the biggest barge on the Main up until then, the large Mainz Market boat (Mainzer Marktschiff) of 80 by 24 feet.[2] The Frankfurt feet was 0.2846 m, and so the metric length measurement of 28.5 m[3] becomes obvious. The beam of 32 feet translates to 9.10 m which would then be the beam including the paddlewheels. The draft of 16-17 inches translates to 0.4 m, which might then be the empty draft.
Delivery of Stadt Frankfurt had been planned for June 1827.[9] The draft problem would cause many delays. Stadt Frankfurt was measured at 130 ton, which was quite small.[4]
The engines of Stadt Frankfurt were ordered at John Seaward & Co., which had also made those for the successful Concordia and Friedrich Wilhelm. The engine produced only 30 hp.[4] This gave the boat a small power to weight ratio.
In 1834 the Gutehoffnungshütte Shipyard in Ruhrort added two low-pressure cylinders to Stadt Frankfurt's two high-pressure cylinders. This made the engine of Stadt Frankfurt a double compound steam engine. The new cylinders were measured at 28 hp, probably giving Stadt Frankfurt a total of about 60 hp. The engines now made 30 turns a minute at 50 pounds steam pressure, instead of only 24. The different number of strokes that the cylinders made had to be handled by cogwheels, which somewhat limited the effectiveness due to friction losses.[10][11]
