Curmudgeon in Training (CIT)
- Apr 13, 2009
- Warren, VT USA
That would be a record low for something carrying an actual human. Having said that Mike Arnold was working with cruise numbers under 1 sq foot and certainly Lars Giertz', Vmax Probe would have been verified under 1 sq foot with a conservative margin. Those plus most modern racing sailplanes make it under the 1 square foot mark in inter-thermal cruise if you inspect just by speed and best glide ratio. Not sure about thermaling trim but probably there as well, mostly just by exploiting high AR, laminar flow, interference flow management and extreme wetted area management.I get 0.3sqft of drag area...
I would guess that the DA-11 was somewhere close to the AR-5. They have about the same numbers except HP.