Rupertinoe

The Rupertinoe was an advanced naval gun designed by, and named after, Prince Rupert of the Rhine in the 17th century.

Details
Naval warfare in the Restoration period placed an emphasis on naval firepower; as one writer has put it, warships had evolved into "floating artillery emplacements". The Rupertinoe gun was a response to this challenge. Designed by Prince Rupert, an experienced naval commander and senior admiral of the Royal Navy, the gun was intended for use against the Dutch during the Anglo-Dutch Wars.

The Rupertinoe was a high specification, annealed and lathe produced gun made at Rupert's foundry at Windsor Castle reflecting Rupert's scientific interests in metallurgy—he was the third founding member of the Royal Society. Unfortunately the high cost of the gun—three times the price of a regular weapon —meant that by the Third Anglo-Dutch War (1672-4) only three ships had been equipped with it: the Royal Charles, the Royal James and the Royal Oak. The cost of the gun led to a fraud investigation by the Naval Commissioner Samuel Pepys, although no evidence to support the claim was discovered.