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To adapt the original Su-27 for naval operations, Sukhoi first incorporated a reinforced structure and undercarriage to withstand the great stress experienced upon landing, particularly quick descents and non-flare landings (landings where the aircraft does not 'float' and slow its descent rate just prior to touchdown).[21] The leading edge slats, flaperons and other control surfaces are enlarged to provide increased lift and manoeuvrability at low speeds, although the wingspan remains unchanged.[22] The wings feature double-slotted flaps and outboard drooping ailerons; in total, the refinements enlarge the wing area by 10–12%.[21] The wings and stabilators are modified for folding to maximise the number of aircraft the carrier can accommodate and to allow ease of movement on deck.[21] The aircraft is outfitted with more powerful turbofan engines to increase thrust-to-weight ratio, as well as an in-flight refuelling probe.[21] The Su-33 sports canards that shorten the take-off distance and improve manoeuvrability, but have required reshaping of the leading edge root extensions (LERX).[22] The rear radome is shortened and reshaped to prevent its striking the deck during high-Alpha (angle of attack) landings.[23]