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

PTO-4 oli Eestis aastail 1938–1940 toodetud õppelennukitüüp. Õppelennuk PTO-4 ehitati Voldemar Posti, Rein Tooma ja Otto Orgi poolt (lennuki nimetus moodustati ehitajate initsiaalidest).1

Made by TallinnAviotöökoda.

PTO-4 cap on both ends (no * indices needed for your convenience). Please observe 5´-3´orientation of the short Adaptor (A-s) sequence (Oligo b).2
Production Start Year
1938
Primary user
Estonian Air Force
Luftwaffe
Number Built
8
Manufacturer
Tallinn
Aviotöökoda
Designer
Voldemar Post
Richard Tooma and Otto Org
Retired
1944
Production End Year
1938
Introduced
1938
Produced
1938
Category
Aviation in Estonia
Military equipment of Estonia

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