What are the power specs? For battery powered applications like the shown mini-quadcopter you really need to know the watts as well as weight. Admittedly, WiFi has a very spiky power consumption profile.
Current consumption:
0.13A - same module, wifi off
0.17A - same module, wifi enabled
0.14A - dock (RJ45 included) + wifi off
0.20A - dock (RJ45 included) + wifi enabled
according to one of WRTnode from http://openrouter.info/forum/viewtopic.php?p=36058
and WRTnode is about 20g in weight.