Hi
the 16/15 low winds are capable of 300watts!! I swing a 7x6 on my /3 it it is bairly warm after a 17 min flight!
i think you need way better cells as the KAN1050s are the limit here.
pop in 1950Faup or a 3s li-po and you will get performace!
[link=http://www.henke.rchomepage.com/video/spit2.wmv]1/12 Spitfire[/link] /3 on 2sli-po 7x6 AUW 850grams
[link=http://www.henke.rchomepage.com/video/vip2004_2.wmv]VIP Pylon[/link] /3 on 3s2p Etec HP 4,75x4,75
your /4 should be able to perform simular, just add one inch on prop diameter, and feed it with some good juice from the battery.
