The R-29 was a new design developed by Raab's Greek company in late 1936 but shared structural characteristics with the preceding R-27 type (a type also first recorded as an AEKKEA-RAAB product by Jane's 1935 ed.,[2] most probably designed earlier by Raab and never produced), which featured an inline Hispano-Suiza 12Y engine, retractable undercarriage and twin machine-guns.
reported it as a fighter, but Raab later described it as a trainer,[1] which would be borne out by the low powered engine chosen.
A batch of these aircraft, along with the Tigerschwalbe R-26V/33 (derived from an earlier Raab-Katzenstein model), were to be delivered to the Republican forces.
Components of 30 aircraft were to be produced in Greece and shipped to Spain, where a subsidiary would carry out final assembly.
According to Raab, the Republicans gave roughly 60 incomplete airframes of both types, along with plans to the Soviets to be shipped back to the USSR.