Andreas Maurer wrote:
7 points of missing L/D compared to the manufacturer's numbers is a
universe (and looks extremely low for the Sparrowhawk's aspect ratio).

Well, any L/D claims by a first time sailplane designer probably have a
large component of optimism. On the other hand, getting 32:1 out of an
11 meter glider (with a cockpit even fairly large people can fit into)
is a pretty decent first effort...

Marc