verticle grimace......I guess you did not get an earlier reply but here it is again cell# 816-868-9454 call me I can tell you anything you need to know...1/2a is 42' lines if you are not flying a cyclone or fora you might be at a disadvantage. The F2D balances about 3/8" behind the spars you may want to go 1/2". Let me know if you have any more questions