The manufacturer states 9x4,3 or 8x4,3 for the Typhoon 6. Sorry I assumed you had the bigger Typhoon 15, which is IMHO more suitable for the Formosa. Try 9x4,3 APC or GWS, a bigger prop might be too much for your lipo cells. If you have the chance to, check the amps of your setup and decide: if the amps at full power are more than what the lipo cell manufacturer states on the pack, then choose a smaller prop.

Have a look at the electric flight forum over [link=http://here]http://www.rcgroups.com/forums/index.php?s=&topic=air-elec[/link] for a lot of comprehensive information about lipos and why you have to be careful when charging them.

Have fun![sm=tongue.gif][sm=thumbup.gif]

Regards,
-Fabrizio