Screw-propelled vehicle

High school (ages 12+)
Transportation

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/screw-propelled-vehicle

1. What is the vehicle classification?
2. What is the propulsion principle?
3. How do the screws help the vehicle travel over soft ground?
4. Why do screw-propelled vehicles have two screws that spin in opposite directions?

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the vehicle classification?Marginal Terrain Vehicle (MTV)
2. What is the propulsion principle?Inverse application of the Archimedes screw principle for locomotion
3. How do the screws help the vehicle travel over soft ground?The spiral flanges dig into the soft surface, and the vehicle’s weight is spread over the screws, so it floats and moves without sinking.
4. Why do screw-propelled vehicles have two screws that spin in opposite directions?The opposite spin cancels twisting forces, keeping the vehicle steady and letting it go straight forward or backward.

Helical flange: A spiral ridge on a rotating cylinder that engages with the terrain for propulsion.
Marginal terrain: Ground conditions that are difficult or impossible for conventional vehicles to traverse.
Counter-rotation: The action of two rotating components turning in opposite directions simultaneously.
Amphibious vehicle: A vehicle capable of operating on both land and water surfaces.