Keystone Pronto

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The Keystone K-55 Pronto was a mailplane developed in the United States in the late 1920s. It was a conventional single-bay, unequal-span biplane design with slightly staggered wings. The pilot sat in an open cockpit, in tandem with a second cockpit that could carry two passengers side-by-side. The fixed, tailskid undercarriage had divided main units.

A number of these aircraft were purchased by the government of Peru. Operated by the aviation arm of the Peruvian Navy, these aircraft initiated the first airmail service into the Peruvian Amazon. The first flight of this service was made by two Prontos, piloted by Leonardo Alvariño Herr and Harold B. Grow from Lima to San Ramón on 26 October 1927.

At least one Peruvian Pronto was fitted with pontoons and used to survey the Amazon River for locations suitable for seaplane operations.

pecifications

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crew=One pilot
capacity=2 passengers
length m=8.15
length ft=26
length in=9
span m=12.17
span ft=39
span in=11
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eng1 number=1
eng1 type=Wright J-5
eng1 kw= 160
eng1 hp= 220
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max speed kmh=180
max speed mph=112
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range km=800
range miles=500
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References

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* [http://aerofiles.com/_keys.html aerofiles.com]