| PTO-4 | |
|---|---|
 РТО-4А | |
| General information | |
| Type | Trainer |
| Manufacturer | Aviotöökoda, Tallinn |
| Designer | Voldemar Post, Rein Tooma and Otto Org |
| Primary user | Estonian Air Force Luftwaffe |
| Number built | 8 |
| History | |
| Manufactured | 1938 |
| Introduction date | 1938 |
| Retired | 1944 |
The PTO-4 was an Estonian-designed military training aircraft of World War II.
Contents
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]
