Bat Bone arm length?

MV912

Junior Member
Hi all! I've been wondering what lengths of arms are you using for your Bat Bone V-Tail builds?
On my build, I'm using NTM 28-30s 900kv / 270w with 10in props. Arm length tbd. Atm I temp have 12in arms fwd and rear but am thinking of 10in fwd and 11-12in in the rear.
Any recommendations/ideas?