• Features
  • Contact
  • Hydrofoil
  • News

Call us today! +1 305 900 4444

Find our Location
fly@quadrofoilusa.com
Login

Login
Quadrofoil USA Quadrofoil USA
  • Features
  • Contact
  • Hydrofoil
  • News

Hydrofoil Explained


Quadrofoil Electric Personal Watercraft are sold in Miami now.

Home Hydrofoil

Hydrofoil Explained

Many people are familiar with airfoils. Foil is simply another word for the a wing (such as the wing on an airplane). A hydrofoil is a wing that ‘flies’ in water. Hydrofoil is also used to refer to the boat to which the water wings are attached. A hydrofoil boat has two modes of operation: (1) as a normal boat with a hull that displaces water and (2) with the hull completely out of the water and only the foils submerged.

Hydrofoils let a boat go faster by getting the hull out of the water. When a normal boat moves forward, most of the energy expended goes into moving the water in front of the boat out of the way (by pushing the hull through it). Hydrofoils lift the hull out of the water so that you only have to overcome the drag on the foils instead of all of the drag on the hull.

The foils on a hydrofoil boat are much smaller than the wings (foils) on an airplane. This is because water is about 1000 times as dense as air. The higher density also means that the foils do not have to move anywhere near as fast as a plane before they generate enough lift to push the boat out of the water.

quadrofoil usa electric limited edition
quadrifiol usa foils orange
quadrofoil usa electric watercraft

The hydrofoils generate lift only when they are in the water; if they leave the water, the boat will crash down onto the surface of the water (and thus submerge the foils) until the foils generate enough lift to lift it back out.

Like an airplane, a hydrofoil must be controllable in terms of pitch, roll, and yaw. Unlike an airplane, a hydrofoil must also maintain a consistent depth. Whereas an airplane has a range of about 40,000 feet in which to maintain its altitude, a hydrofoil is limited to the length of the struts which support the boat above the foils.

Most commercial hydrofoils are boats with ladder foils (wings stacked one above another with space between them). This configuration is analogous to a biplane. But the reason for stacking hydrofoils is different than the reason for stacking two wings on an airplane.

Ladder foils make the boat easier to control when the water is not flat. If the boat is flying through waves, the wings will generate lift only in the crests; when the boat hits a trough the wings will leave the water and the boat will crash down. When a stack of ladder foils moves through the waves, chances are that some of the foils will be submerged even if some leave the water (unless the waves are really big).

There are two particularly persistent problems faced by designers of hydrofoils: cavitation and ventilation. Ventilation occurs when part of a hydrofoil pierces the surface of the water and air gets sucked down the lifting surface of the foil. Since air is much less dense than water, the foil generates much less lift and the boat crashes down. Ventilation can occur at any air-water interface.

Contact Us

We're not around right now. But you can send us an email and we'll get back to you, asap.

Send Message
Experience something completely different. The most inovative watercraft on the market. Buy One Today!
Logo The first all electric hydrofoiling personal watercraft on the planet Earth.

Get one today.

Contact Info

  • Your Company
  • 555 NE 15th Street, Suite 200, Miami, FL 33132
  • 305 900 4444
  • fly@quadrofoilusa.com
  • quadrofoilusa.com
  • quadrofoilusa

Video Widget

Flying above waves is a real joy ride. Additionally, we designed the seats to be ergonomic and soft. You’re sure to stay dry and fly.

[Video Widget Error] Sorry, but the URL you entered is not supported. Check http://codex.wordpress.org/Embeds for more info.

Future Events

August 2022
M T W T F S S
« Jul    
1234567
891011121314
15161718192021
22232425262728
293031  

© 2022 — Quadrofoil USA. Theme by HB-Themes.