Variants
- S-451
- The original aircraft, fitted with 2 Walter Minor 6-III piston engines and a prone pilot cockpit.
- S-451M
- (Mlazni - Jet) Derived directly from the S-451 airframe, the S-451M substituted Turboméca Palas turbojet engines for the piston engines, in underslung nacelles at the same positions on the wing and conventional cockpit.
- S-451M Zolja
- (Zolja - Wasp) Flown in 1954, the S-451M Zolja featured a stretched fuselage, folding wings, and engine nacelles centred on the wing chordline. Used to set a world speed record in its class in 1960.
- J-451MM Stršljen
- (J - Jurisnik - close support) (Stršljen - Hornet)The intended production close support version with tricycle undercarriage, Turboméca Marbore engines and cannon armament.
- S-451MM Matica
- (Matica - Queen bee) Two-seat trainer version, used for a world speed record in 1957.
- T-451MM Stršljen II
- A single seat aerobatic trainer.
Read more about this topic: Ikarus 451
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