Ryan, the prop collision needs a little work. Take the stearman from a still position, add full down elevator, then full throttle. You'll end up on the top wing. You can then add full up and go back on the mains and takeoff. Just a minor detail. Just wish there were a free 3D model.
RealSub looks intense....but seriously, the mobile app rocks. I'm buying flingsticks right now. You should offer a discount pack for people who will buy everything at once! And I would gladly pay about $10-$20 for a season pass that will unlock everything and any planned future content!