"I think 4-8hrs should be possible in future, there are some very exciting battery technology in development. Lithium-Sulphur battery have double the energy per weight of the current LIPOs. Given that the current record of flight time is around one…"
www.taobao.com (currency in RMB)
Actually all RC part are very cheap selling on this site. I guess it is most probably the cheapest in the world. Actually you can find 3dr Radio, ESCs, Sonars, uBlox GPS etc.... in very very good price.
"The calculator show use 100% throttle as the bases for "flight time". Clearly a large prop will draw more current, thus lower "flight time". However, in reality, the large the prop u got, you will normally fly in lower…"