Hi Folk, I Have the two blade manuel in flight adjustable woodcomp varia composite prop from junkers czech republic. Have no doubt this combination suits the 80hp rotax, smooth, simple light and easy to install, max rpm on take off cruise 90 kts 5200 rpm, If I wish can idle engine 600 rpm, mk 4 1050lb speedster options reg G-FOXF. ps still have the gsc hanging in the garage,