I missed the other thread for some reason and have to admit I'm not up to reading right through it but it's inspired me. So here we go.
1930: The Polish government signs a contract with American tank designer Walter Christie for the production and delivery of a single M1928 tank. This arrives in Poland in July.
1931: Zygmunt Pulawski, designer of the PZL P.7 fighter decides to postpone the sixth test flight of his PZL.12 flying boat because of adverse wind conditions. The first test model of the TPC (Tank Polish Christie) rolls out.
1932: The first Vickers 6-Ton tanks arrive in Poland. While they are found acceptable it is obvious that the TPC has more potential.
1933: Adolph Hitler comes to power in Germany. The Polish Air Force issues a requirement for a monoplane fighter with a speed of 300 mph and an armament of six 7.92 mm machine guns.
1934: The Polish government commits to a major rearmament and military reorganisation program. The Polish Air Force issues a requirement for a twin engine "attack fighter" armed with four 20mm cannon. The Polish army and airforce both start research into rocket artillery.
1935: The prototype PZL P.29 flies. Designed by Zygmunt Pulawski the P.29 is a stressed skin low wing monoplane with wide set retractable undercarriage, powered by a Pratt & Whitney 1050hp engine. At the same time the initial production batch of the 18TP tank. The tank has Christie suspension, well sloped armour, a 37mm Bofors gun and two 7.92mm machine guns, a 190hp engine and most importantly a five man crew of commander, gunner, loader, driver and radio operator. A Polish delegation visits the Skoda Works in Czechoslovakia to view potential products. An order for 200 10.5 cm Vz 35 field guns results as does an interest in the latest 47mm anti-tank gun. A batch of modified Tatra 82's is also ordered to increase infantry mobility. The Poles start to experiment with armoured brigades.
1936: The first flight of the PZL P.33 ground attack plane. The aircraft is a single seat, stressed skin monoplane powered by a pair of Twin Wasp engines. The plane is fast, agile and well armed with four 20mm Oerlikon FF cannon. It is also armoured. A government report recommends that Poland develop a tank destroyer using a turretless hull of the 18TP to allow a build up of AFV numbers. The vehicle, designated 18TD, will mount the 47mm Skoda model 35 anti-tank gun. It is also recommended that the 18TP is equipped with this gun. Licenses to produce the 10.5mm Skoda gun and the Tatra T82 are purchased.
1937: PZL P.29 enters service. The production version is armed four .50 machine guns and is capable of 320 mph. The Polish Army tests it's firs rocket artillery system. Consisting of a Tatra T82 truck mounting ten launch rails for 120mm rockets the weapon proves highly successful in the tests and is ordered into production. The parallel Air Force program to produce an air launched 70mm projectile is also going well.
1938: The mark two version of the 18TP enters production. Minor changes to improve engine power, armour thickness and overall reliability have been introduced but the main change is the switch from the 37mm Bofors gun to the 47mm Skoda gun. The 47mm armed 18TD is also entering production. The removal of the turret allows for extra frontal armour to be carried. An alternative version armed with a French Model 1919 75mm mountain gun is also being designed.
1939: By the end of August the Polish Army will have recieved 60 18TP (37mm), 175 18TP (47mm), 120 18TD (47mm), 82 18TD (75mm), 200 10.5 cm field guns, 90 T82R, while the Polish Air Force has 200 PZL P.29 and 120 PZL P.33, just under half of the latter are modified to carry 70 mm rockets.