I am about to buy a rotax 912ULS. Will a variable pitch prop extend the range significantly or would the same result come from the prop being set in the cruise pitch and sacrifice the a bit of take off performance?

have a look at the duc swirl prop, as fitted to the dynamic WT9

Happy ending,

What aircraft? If the speed range is large you will defiantly get an advantage. I have just changed from a ground adjustable to a Constant Speed Control (CSC1) with a PV50 prop on an MCR01. Drop me a pm if you want more as I had a good look round before I made the jump..

Rod1