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THE ITALIAN SEAPLANE P.R.B. 1. One of the most interesting seaplanes designed and built in Italy, representing a departure from the conventional, was the P. R. B. 1. It was designed by Mr. Pegna. It is a four-motored machine employing the Fiat 300 h.p. engine. Principal characteristics are as follows: Span --------------------- 3 m. 40 Chord -------------------- 3 m. 50 Gap ---------------------- 4 m. Tail surface ------------- 18 sq. m. Mobile surface ----------- 6 sq. m. Total height ------------- 6 m. 60 Total length ------------- 18 m. width of hull. maximum --- 2 m. 81 Height of hull, maximum -- 2 m. 60 Length of wing floats ---- 3 m. 50 Width of wing floats ----- 0 m. 70 Height of wing floats ---- 0 m. 70 Weight, empty ------------ 5200 kgs. Total weight ------------- 8200 kgs. Useful load -------------- 3000 kgs. Total horsepower --------- 1040 Weight per horsepower ---- 7 kgs. 88 Weight per square meter -- 39 kgs. 61 Maximum speed, fully loaded 170 k/h. Economical speed --------- 150 k/h. Landing speed ------------ 80 k/h. This machine is featured by its tandem Fiat engines, mounted on the lower wing. They permit ready accessibility during 553