I noticed that nvAero now offers the KR1B motorglider wing plans. The FAA specifies the criteria for a plane to be considered a motorglider and the main one is:
"The maximum weight to wing span squared w/b squared ) does not exceed 3.0 kg/ma (0.62 lb./ft squared )" http://www.faa.gov/documentLibrary/media/Advisory_Circular/AC_21.17-2A.pdf my main question is how does that calculation work? could not find on the googles.... any input appreciated!
