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The PTO-4 was an Estonian-designed military training aircraft of World War II.

PTO-4
РТО-4А
Role	Trainer Type of aircraft
Manufacturer	Aviotöökoda, Tallinn
Designer	Voldemar Post, Richard Tooma and Otto Org
Introduction	1938
Retired	1944
Primary user	Estonian Air Force Luftwaffe
Produced	1938
Number built	8

In 1938, the Estonian aviation engineers Voldemar Post, Rein Tooma and Otto Org, previously responsible for the PON-1 trainer, designed and built the PTO-4 training aircraft.[1] It was a two-seat low-winged monoplane powered by a De Havilland Gypsy of 120 hp, with a fixed undercarriage that could be fitted with wheels or skis.[2] The aircraft could fly at a maximum speed of 245 km per hour and had a ceiling of 5,000 meters.[3] On 12 October 1938, the PTO-4 was taken into service of the Air Force.[4]

The Estonian Air Force received two PTO-4s (serial numbers 161 and 162), one with an open cockpit and the other an enclosed cockpit.[1] Six examples were in civil use,[5] of which five were used by the Eesti Aeroklubi (EAK), a flying club controlled by the Estonian Military.[1]

Four examples surviving from the Soviet occupation of Estonia (1940–41) were operated by the German Luftwaffe, being operated by a unit manned by Estonian volunteers (initially called Sonderstaffel Buschmann and later 1./SAGr.127) based at Reval-Ülemiste airfield. They were operated as training and liaison aircraft as well for coastal patrol over the shores of the Baltic.[6]

Operators

 Estonia

• Estonian Air Force

 Germany

• Luftwaffe

See also

Related development

• PON-1
• PON-2
• PN-3

Related lists

• List of interwar military aircraft

References

• Gerdessen, F. "Estonian Air Power 1918–1945". Air Enthusiast, Eighteen, April – July 1982. Bromley, UK:Pilot Press. pp. 61–76.

External links

• Estonian Postage Stamp

На других языках

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- [en] PTO-4

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[ru] PTO-4

PTO-4 — эстонский одномоторный двухместный учебно-тренировочный самолёт. моноплан, разработанный в 1937—1938 годах в Эстонии. Также данная модель использовалась в патрулировании Балтийского моря в ходе Второй Мировой войны.

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