Depends on what you consider "very big"
I think that's more a function of how many servos, I just (10 minutes ago actually) setup a 60cc Raven with a 26D receiver using 2 batteries and 2 HD switches, and a Spark Switch Pro for the ignition. Looking forward to seeing the ignition telemetry in action.
But its only got 6 servos so while it's "big" i don't see the need for a Mercury like my Havoc GTS with flap servos, landing gear, nose steering, brakes etc.