Here's something I've been meaning to finish for a while, the second batch of the R 00 series of destroyers, rechristened the R 21 class;
After the initial 20 destroyers of the R 00 were constructed, it was decided to improve the design for hull numbers 21-29 with changes deemed necessary or seen as incremental improvements. The basic hull remained unchanged other than the slight flaring and raising of the bow to improve seakeeping and the removal of the aft sponson gun emplacements. The rear set of torpedo tubes was removed and replaced by imported 2 pounder AA guns from the United Kingdom to improve air defense capabilities. The searchlight was repositioned and depth charge racks fitted to the stern with a total capacity of 12 charges.
The restricted hull space meant that coal bunkerage space had to be reduced to stay within stability limits and to offset the increased weight. Speed was also reduced from 22 knots to 20 as a result of the changes.
These vessels would only remain in active naval service until 1921 when they were made obsolete by newer designs. As their commissioning was only between 1914-15, this made them one of the shortest lived naval types in history.
This image depicts R 29 at her time of commissioning in June 1915. She would be laid up in 1921 and scrapped by 1928.