It can be a kids encyclopedia to help them learn about helicopters, or it can be an informative tool for anyone that is interested in helicopters. We have worked diligently to select the best photos and create content that is engaging, easy to understand and relevant. CHI Encyclopedia of Helicopters looks stunning on both iPhone and iPad. We have also thought of a way to motivate you to read more. Collect different badges for reading pages. We also made the encyclopedia to be available entirely offline (so you can read it in the car or on a plane). CHI Encyclopedia of Helicopters – All Helicopters — Helicopters are included from A-Z — Neat organization and beautiful HD photos — Relevant information about helicopters that is nicely written — Great for all ages — Available offline, read it on the go Simple, intuitive and elegant. With CHI Encyclopedia of Helicopters you can know everything about helicopters.