The Mk XVII was enhanced from earlier variants by way of the reinforced main undercarriage This went some way towards taming the deck behaviour of the Mk XV reducing the likelyhood of the propeller tips hitting the deck during an arrested landing & the softer oleos stopped the aircraft from occasionally bouncing over the arrestor wires & into the crash barrier In addition the wings were reinforced with a stronger mainspar necessitated by the new undercarriage & they were able to carry heavier underwing loads than previous Seafire variants