sentences:  The design used the company's experience with large scale production of the Short Sunderland.The end of World War II prevented the Shetland from entering production; it was the first aircraft designed with a 110 volt electrical system.Specification R.14/40 replaced an earlier specification R.5/39 which was an up-armed revision of specification R.3/38 for a faster flying boat than the Short Sunderland.