The British magazine The Engineer dated 4 August 1882 published a drawing of a torpedo boat built by Yarrow&Co., Poplar for Brazilian account. The drawing showed one of the four boats built fitted out and ready for the departure towards Brazil. Dimensions were 110 x 12‘6” feet. Vor the voyage were the boats temporarily fitted out with a false keel. The edition dated 30 June supplied more details about the 110 feet long torpedo boats which were fitted out with double torpedo tubes and taken with them 2 reserve torpedoes of Whitehead which could be fast used for reloading. The torpedoes were fired with the use of compressed air. Coal bunker capacity sufficient for a range of 1.300 miles with a moderate speed. According to the contract were the boats to steam with 12 ton load during 3 hours maintaining a speed of 18 knots. Three of the boats already performed their trials and now was the last and forth boat to do so. The Brazilian naval attaché captain C.J. de Mello, captain Lobo and mr. Crohn, the latter representing the shipyard were present. Due to the many people on board was the laid increased to 12,13 ton instead of the contracted 12 ton. During 3 hours was the torpedo boat without test tested resulting in 3 pairs of runs on the measured mile. The achieved speeds were first set 20,721, the second 20,362 and the third set 20,414 knots. After a calculation was that her medium speed during to the trials was 20,3 knots which was a magnificent result. According to the same calculation were 1.312 rpm needed for one knot in still water. The weight of her machinery was 16,75 tons. Usual rpm was 440 rpm with a pressure of 112 lb per square inch. Fitted out with two rudders, one at the bow and the second one at the stern. The ships were even with a speed of 20 knots easily to be turned.
According to Conway’s All the world’s fighting ships 1860-1905 built Yarrows five steel hulled torpedo boats namely the No. 1-5. Except for the No. 1 which was 10 feet shorter were the dimensions 110 x 12’6” x 5’6” or 33,53 (the No. 1 30.480 x 3,81 x 1,68 metres and a displacement of 40 (the No. 1)-52 (the No.‘ s 205) tons. The armament consisted of 1-3.7” guns and 2x1-14” torpedo tubes fitted above the waterline. Further more were these boats fitted out with a ram bow and could carry 4 torpedoes with them. Around 1910 were these boats stricken.
