Just use the one log book. At the bottom of each column on the right hand page put in two totals, Helo and Plane. Just write small and neatly and it fits in fine. At the bottom of the left hand page you have separate fields for helicopter and fixed wing and a grand total. As a flight examiner when I assess your total flying experience it makes it simple and easy and gives me a good overall indication of your total flying experience. Hope that helps.