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Safe Foil System

The Safe Foil System of IFS that  is incorporate in the Mothquito, is an integrated box-foil with its lower outlet above the waterline. When hoisting the V-Foils, their wings are elevated above the waterline, allowing the Mothquito to beach without risk of damaging their foils by contact with the ground. This system also provides the possibility to launch the boat on the shore itself, without having to carry it to find enought draft because it also allows you to navigate with openwork minimally foils. Due to its small size and low weight the Mothquito can be transported over the car.


To facilitate the conventional mooring of a yacht, the Safe Foil System implements a superior articulation in the V-Foils allowing to get down the foils below the maximum work position, to then swing them up until being vertically inverted over deck, to limit the beam to the own beam of the boat.

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But undoubtedly, the most striking in this boat is the innovative IFS (Increased Foiling System). 

A system that implements and combines a number of solutions to significantly increase the dynamics length and beam of the boat, improveing longitudinal and transversal stability, to achieve increased performance with greater safety at high speeds.

IFS comprises various solutions are combined and complement each other:

  • Increased dynamic length

  • Increased dynamic beam

  • V-Foils with "doble lift"

  • Safe Foil System

Increased dynamic length

The IFS solution to increase dynamic length, is based on two advanced main V-foils and a extendable arms that can regulate the working distance of the T-foils rudder in two positions beyond the transom. This increases the distance between dynamic lift points (main V-foils and rudder T-foils), extending the boat length in flight too up to 50%, specifically 3.05 m hull length to 4, 50 m in length overall in flight. With this it´s possible to delay the weight of the crew to move the center of gravity further aft and to be able to regulate, correct and improve the dynamic trim or longitudinal balance with an improvement also in the rudder response.

  • Improved dynamic trim 
By distancing theirs T-Foil rudders with respect to the stern of the boat is achieved, by lever effect, increase the lift of the T-foils rudder, which allows the navigator to stand further back to avoid a negative dynamic trim (bows falls down), thus reducing the risk of pitch-pole.
By distancing their T-Foils rudders in respect to the main V-Foils, the trim is improved with a higher longitudinal balance, while in a shorter distance, the dynamic trim will become more unstable, increasing pitching and the risk of pitch-pole. The solution improves the steering response too.

  • Improved steering response
Similarly, the greater the distance between lift points (main V-foils and rudder T-foils), the smoother the steering response, but while the distance between them decreases the rudder response will be more  violent and vague, and steering the boat will be more difficult. This is why the MOTH International added extenders fixed rudder foil.




Increased dynamic beam

The Mothquito incorporates a long foils in V facing outwards and provided with "double lift", whereby an increase of the dynamic beam up to 250% with respect to the sleeve hull is achieved, providing great lateral stability and a significant increase righting moment, which translates into a safer and more comfortable foiling with a considerable reduction in heeling. This allows the Mothquito to oversizes its sail area to equate to a larger boat, but with much less weight, which gives us an idea of the potential speed and adrenaline that offer this small flying insect of just 3.05 m length, able to increase its dynamic beam up to 4.80 m.

V-Foils with "doble lift"
Their foils in V have the advantage of auto-adjust the height navigation automatically without flaps or sensor, since the higher boat speed increases the lift force while the wet surface of the foil is reduced until the weight of the boat itself prevents the foils to go out of the water and collapse, thus automatically adjusting the height of foiling. In other words, if the boat rises too high, the submerged V provides less lift, while if the boat descends, the V submerges providing more lift and raising the boat again.
These foil in V also have two sines, the main or conventional sine V, and a second sine in the wingtip and directed downwards called by IFS as double lift, which has the function of increasing the lift due to its design, to reduce the transition time to flight mode. This double lift also acts as a barrier to minimize vortexes generated at the wingtips by difference preassures, subtracting performance. This solution also increases the safety of the boat, since these sharpened points facing down, do not pose a risk to the integrity of the crew in case of man overboard.



The IFS System consisting of extensor arms rudder foils and foils in V with double lift in a forward position for increased the dynamic length and dynamic beam, for increase and favorece the righting moment, the stability and the trim, making the boat  more stable, powerful, safe, and with a more controlled flight.



Graphical comparison to better understand the IFS system that incorporates Mothquito

Mothquito® and IFS® are registered trademarks

IFS is a patent granted and in force.

Contact: Toni Blanc

Made in Spain

 Copyright © 2018 by IFS Foiling. All rights reserved. Intro Video: RavenProDesign Youtube Channel 


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