Engineering- Hovercraft Design - Episode 305



Make your own hot air balloon, from a lightweight plastic bag, paper band, thread, cellophane tape, and paper clips. Have a thermometer handy to measure the outside air temperature. Inflate the bag with hot air from a hair dryer. (Don’t use flames to heat the air for this experiment!) When it’s full, release it, and try to measure how high the balloon flies, and time how long it stays in the air before returning. Do you get different results in the cool morning air, compared to the heat of the afternoon? What other changes in your balloon design give it a long-lasting flight? Go to Be On DFTV and tell us what happened!