I thought the 13x4w prop was too much. Yeah I got 12k rpm with the West 50t1 but spool up wasn't that great. I'm usingh the 12.25x3.75 which is recommended in the instructions and used by the nice chap at Weston i spoke to on the phone the other day (Simon?). Fuel is ProSynth 10% - good stuff!

Not sure where my CG is (I know its waaaay back) but my battery is behind the wing. I'll post some pics of my install when my camera battery is recharged.