Since all the new pilots in this forum fly electric, let me point you to this resource which can be found on RCUniverse. This e-book should answer a lot of questions about electric powered flight.
EVERYTHING YOU WANTED TO KNOW ABOUT ELECTRIC POWERED FLIGHT<div>
<font color="#800080">http://www.rcuniverse.com/forum/m_7100376/tm.htm</font></div>