Rainbow-class submarine

The Rainbow class submarine or R class was a class of four submarines built for the Royal Navy in the early 1930s. They were designed as long range patrol submarines for the Far East and were essentially repeats of the preceding Parthian class submarines with minor modifications. Six ships were planned but two boats, HMS Royalist and HMS Rupert were cancelled for economic reasons.

Ships
It is often stated that HMS Rainbow was sunk by the Italian submarine Enrico Toti but the submarine sunk by Enrico Toti was HMS Triad.

Online References

 * Rainbow class on Uboat.net
 * Rainbow class on battleships-cruisers.co.uk