RE: zen 30
antique opa
I did not have to add any additional weight. I was ab;e to move the battery around to acheive proper balance. Verticle is not unlimited but is much more than adiquate. I am very happy with the Zen 30 since it is small enough to take to the field without disassembly or reassembly although it would require two servo wires to be plugged in and two wing bolts screwed down. I am very happy with flying charastics but I like to fly bigger planes. I would like to try a Zen 90 some day when the pocket book will allow.
Good luck with yours. If you do not want to go 4 stroke and are looking for good power, think about an OS 32 SX.
Flashingredd