ers . ▁ ▁The ▁F k 9 ▁is ▁a ▁convention ally ▁laid ▁out ▁high ▁wing , ▁single - engine ▁ul tr al ight , ▁with ▁side - by - side ▁se ating ▁and ▁a ▁fixed ▁under car riage . ▁ ▁The ▁wings ▁have ▁parallel ▁ch ord ▁and ▁are ▁fitted ▁with ▁a iler ons ▁and ▁three - position ▁f laps . ▁ ▁They ▁are ▁b rac ed ▁with ▁a ▁single ▁fa ired ▁str ut ▁to ▁the ▁lower ▁fus el age ▁on ▁each ▁side . ▁ ▁In ▁the ▁Mark ▁ 1 ▁and ▁ 2 ▁models , ▁the ▁wings ▁were ▁composite ▁structures ▁with ▁fabric ▁covering ; ▁later ▁models ▁have ▁had ▁all - car bon ▁composite ▁wings ▁apart ▁from ▁al umin ium ▁control ▁surfaces . ▁ ▁There ▁is ▁now ▁the ▁option ▁of ▁an ▁all - car bon ▁fib re ▁wing . ▁ ▁The ▁early ▁F k 9 ▁marks ▁also ▁had ▁a ▁steel ▁t ube , ▁fabric ▁covered ▁fus el age , ▁but ▁this ▁has ▁been ▁replaced ▁with ▁an ▁all - glass ▁fib re ▁structure , ▁apart ▁from ▁a ▁steel ▁cabin ▁frame . ▁ ▁Access ▁to ▁the ▁dual ▁control ▁cabin , ▁which ▁has ▁overhead ▁trans par encies , ▁is ▁via ▁top - hing ed ▁doors ▁on ▁each ▁side . ▁ ▁The ▁fin ▁and ▁rud der ▁are ▁swe pt , ▁mostly ▁on ▁the ▁leading ▁edge ; ▁the ▁elev ators ▁are ▁horn ▁bal anced . ▁ ▁A ▁tr icy cle ▁under car riage ▁is ▁standard , ▁with ▁( us ually ) ▁sp atted ▁main w he els ▁on ▁spring ▁cant