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Prototypes

Hs 129的設計著重於抗彈力，為了要給予飛行員全面性的防護，故將駕駛艙區域的裝甲帶配置如同大型浴缸一樣，座艙罩結構由鋼質構成至於側邊視窗則由兩塊角玻璃併成· 為了強化抗彈裝甲能力，機身則是呈現三角形的形狀這也讓內部空間頗為狹小· There was so little room in the cockpit that the instrument panel ended up under the nose below the windscreen where it was almost invisible; some of the engine instruments were moved outside onto the engine nacelles, as on some models of 梅塞施密特Bf 110戰鬥機heavy fighter，並且將瞄準器安裝於機鼻區域·

由於選用推力頗為不足的As 410發動機，再加上機體比原先規劃的多12%重量，在測試時該機飛控系統的性能與速度頗為拙劣，one plane flew into the ground from a short dive because the stick forces were too high for the pilot to pull out·

The RLM nevertheless felt they should continue with the basic concept. The only real deciding factor between the two designs was that the Henschel was smaller and cheaper. 福克-沃爾夫的方案則改為候補，並針對Hs 129 A-0進行持續的測試·最後改良出來的結果就是Hs 129 A-1，可以攜帶2挺20 mm MG 151機炮s與2挺7.92 mm (.312 in) MG 17機槍s， 並在機身中線攜帶4枚50 kg (110 lb)炸彈·