Autogyro and needle: what they have in common

1. Step 1. Autogyro — has part — Propeller. A tractor propeller.
2. Step 2. Propeller — is part of — Icebreaker. Propellers.
3. Step 3. Icebreaker — uses — Wedge. The bow rides up onto the ice and crushes it.
4. Step 4. Wedge — is used in — Needle. The point pushes the material apart like a wedge.

Open Evothings