A development of the P.74 helicopter was proposed in 1955 as the P.105 ten-passenger commercial helicopter. The engine/rotor unit was a complete unit and could be fitted above any type of fuselage. The engines were Napier Oryx.
this helicopter was Percival P.86,it was a sixty seat compound helicopter Project for BAEline,a four engined all-metal design,powered by Napier N Or.101 turbo gas generators with a freely tilting twin-bladed rotor of 110ft diameter.