I have flown up to .15 size aircraft with the AR6000 with '0' issues. I would expect no issues with a .40 size airplane flown at any reasonable range. Pay attention to the manufacturers warning that this receiver is not to be used in anything bigger than park flyer size aircraft and be very thoughtful about receiver placement in the fuse. It definitely matters where it sits in relation to rx batteries, servos, engines, etc. The rx must be in the 'line of sight' of the tx in all flight attitudes. The safer thing would be to spring for an AR7000. .02.