Do youself a big favor and go with the 50cc gas. the extreme flight Yak or Extra are very good planes. There are a lot of very good 50cc engines out right now at a good price try the DL 50, or the Area 51.

http://www.rcuniverse.com/forum/m_6493058/tm.htm

http://www.rcuniverse.com/forum/m_7661620/tm.htm

http://www.extremeflightrc.com/html/50ccExtra.html