Notes

Table of contents includes: Cousin Ed's helicopter -- Piston engines -- How a piston engine works -- The Wankel rotary engine -- Rotor blades and flight -- The rotor head -- Flapping blades -- Tail rotor -- Controls -- Test flight -- Emergency landing -- Other types of helicopters -- Parts of a helicopter Summary: Annie helps her cousin Ed rebuild his helicopter. Provides information on the parts of a helicopter and how it works, told as a narrative in comic strip format