# Flying Over Water | Ivan Kruchinin | TEDxSt Peters Intl School Youth

Source: https://www.youtube.com/watch?v=3ywaMonxvAs
Recap page: https://rapidrecap.app/video/3ywaMonxvAs
Generated: 2026-03-06T19:03:15.984+00:00

---
## Quick Overview

Ivan Kruchinin argues that the greatest progress in transportation comes not from adding more power but from reducing resistance, using the example of hydrofoil boats that lift out of the water to minimize drag, enabling faster, quieter, and cleaner travel between cities like Petrozavodsk and Kizhi.

**Key Points:**
- The greatest progress in transportation stems from reducing resistance rather than increasing engine power.
- Hydrofoil boats, like the one shown, use foils to generate lift, raising the hull above the water surface to significantly reduce water resistance.
- A conventional boat remains deep in the water, increasing resistance, while a hydrofoil lifts to ride just inches above the surface.
- The speaker built a model hydrofoil using foam and three wings to prove this concept, noting that the journey was difficult until the sixth attempt.
- The distance between Petrozavodsk and Kizhi (160 km) can be traversed in two hours by hydrofoil, compared to two hours by a conventional ferry.
- Electric hydrofoils are becoming more viable, offering transportation that is faster, quieter, and cleaner than traditional methods.

![Screenshot at 0:08: Ivan Kruchinin shows an image of a modern orange and white hydrofoil boat moving quickly across the water, illustrating the vessel type central to his presentation on reducing water resistance.](https://ss.rapidrecap.app/screens/3ywaMonxvAs/00-00-08.jpg)

**Context:** This TEDx talk, presented by Ivan Kruchinin at St. Peter's Intl School Youth event on February 7th, 2026, focuses on the engineering concept of hydrofoils. Kruchinin frames the discussion around the idea that engineering advancement is often about minimizing resistance (drag) rather than maximizing force, drawing parallels between aviation principles and marine transport to advocate for the efficiency and environmental benefits of hydrofoil technology.

## Detailed Analysis

Ivan Kruchinin presents his central argument: significant progress in transportation results from minimizing resistance, not just increasing power. He uses the example of hydrofoil boats, contrasting them with traditional boats. A traditional boat sits deep in the water, fighting significant water resistance, which limits speed and efficiency. Conversely, a hydrofoil uses its submerged wings (foils) to generate lift at speed, raising the hull entirely out of the water, leaving only the small surface area of the foils submerged. This drastically reduces water resistance, allowing for much higher speeds with less engine power. He relates this to his personal experience building a model hydrofoil in Russia, which took many failed attempts before achieving flight, emphasizing that achieving stable flight required careful design and adjustment of the foils. He cites the route between Petrozavodsk and Kizhi (160 km) as an example where a conventional ferry takes two hours, but a hydrofoil can make the journey in under an hour. Kruchinin concludes that modern electric hydrofoils are making this quiet, fast, and clean mode of transport increasingly possible, changing how we perceive travel across distances.

### Hydrofoil Principle

- Water resistance is minimized when the hull lifts out of the water via lift generated by foils
- Engine power overcomes tiny water resistance when airborne
- Stability requires continuous adjustment of foil angle and speed

### Personal Project

- Speaker built a model hydrofoil using foam and three wings after struggling for a long time (not working on the first five tries)
- The final successful flight demonstrated the core concept

### Impact on Transportation

- Hydrofoils offer faster (160km in under 2 hours vs. 2 hours for a ferry between Petrozavodsk and Kizhi), quieter, and cleaner travel
- Progress comes from avoiding resistance, not just adding power
- Electric hydrofoils are making this technology practical.

![Screenshot at 0:02: Title slide showing event sponsors, including S3 Studios, Cromia Publicidade, Carme do Convento, and others.](https://ss.rapidrecap.app/screens/3ywaMonxvAs/00-00-02.jpg)
![Screenshot at 0:06: Ivan Kruchinin stands on stage at TEDxSt Peters Intl School Youth, with his presentation slide showing his name and talk title 'Flying over water'.](https://ss.rapidrecap.app/screens/3ywaMonxvAs/00-00-06.jpg)
![Screenshot at 1:17: A diagram illustrating the physics of a hydrofoil: engine power pushes forward against water resistance, while lift generated by foils pushes upward.](https://ss.rapidrecap.app/screens/3ywaMonxvAs/00-01-17.jpg)
![Screenshot at 2:14: A satellite map showing a red line indicating a route between Petrozavodsk and Kizhi on a large body of water.](https://ss.rapidrecap.app/screens/3ywaMonxvAs/00-02-14.jpg)