Just to follow up here: wasn't there an updated cg placement on GP website? I know in the manual it says 4 5/8". BTW, I have an ASP 46 in mine and man, I'll be needing to add a fair amount of tail weight. I'm sure the truturn spinner isn't helping, but it looks good. I've got my Rx in that little spot under the canopy, but behind the gas tank. The battery is another story. I saw one pic on RCU where a guy velcro'd his battery pac around the wing bolt wooden block, but not sure how this would work. I'd be afraid of having the battery pulled too tightly up against the rudder and elevator pushrods, causing binding. Any other way around this?