dLRK stands for 'distributed lrk' where all teeth are wound. Instead of say winding 20 winds on 6 of the 12 teeth (lrk), you wind 10 winds on each of 12 the 12 teeth. Both methods will give 20 wires/winds in each slot between the statorpoles.
So, that 'd' is not about delta. Which indeed is not very clear in the rcgroups discussion.
Excellent dLRK winding tutorial:
http://www.rcgroups.com/forums/showthread.php?t=736580 Vriendelijke groeten 
Ron van Sommeren
int. electric fly-in & diy outrunner meet, Nijmegen, the Netherlands