The E-Telltale of the Future
The E-Telltale's Interest
Developed and improved for more than 15 years by Mer agitée, the E-Telltale® allow to make «electronic» the information normally only visual of the wool telltale. This system, developed, tested and proven by Michel DESJOYEAUX, has shown its efficiency and durability.
We wanted to develop a system that would allow access to sail trim information, day and night and in all weather conditions, with the objective of being able to analyze performance in real time
Its Interest
The E-Telltale® allow to make “electronic” the information which normally is only visual of the wool telltale. This system has been developed, tested and proven by MerAgitée and Michel DESJOYEAUX on a Vendée Globe (and not only) and has shown its efficiency and durability.
The electronic telltale (E-Telltale®) allows real-time monitoring of the aerodynamic performance of a sail
The E-Telltale® is a sensor that monitors in real time the state of the airflow (hooked/laminar or unhooked/turbulent) on an aerodynamic profile. It is a technology from offshore racing, which is very useful in the sailing merchant marine sector, the sport marine and in wind energy as well. Indeed, better tuning of the telltale allows you to optimize the performance of your sail in order to take advantage of the wind’s potential
Find here a video of Michel DESJOYEAUX called “the professor”, talking about his E-Telltale®

Its Use
For a sail to be efficient, the air must circulate freely on each side (i.e. top and bottom) of it with clean flows (laminar flows). The danger (and the brake) is the turbulences. Telltale, strands of wool glued on each side of the sail, help to materialize the flows
Its Use
On the headsails, they are the main indicators to help the helmsman or the trimmer. The strands of wool are glued on each side of the sail along the luff. Depending on their position, they allow us to optimize the laminar flow so that the sail is used at 100% of its potential.
Be careful not to install them too close to the forestay, which can cause turbulence (furler tube or carabiners). On the mainsail, the telltale are placed on the leech.
They allow to read the laminar flows on the whole height of the sail. The helmsman does not need them as much as the headsails, but they are useful for the mainsail trimmer who can use the sheet or the traveler.


The Possibilities
Learn more about what our E-Telltale®️ will allow you to do once installed on your boat
What You Can Do With It
– View your Telltales directly on your screens:
- On our TrimControl Application.
- On Adrena (V.20).
- On your Sailmon displays.
- Soon on NKE, Garmin, B&G and Raymarine displays.
– Retrieve data (as logs) to refine your polars and sails configurations.
– Indicate the sails used during your navigations to update Sailect on Adrena.
– Analyze your sailing to realize your settings on your tracks.
– Observe the premature wear of your sails thanks to a permanent control system. You will be able, from your cockpit, to refine your settings to limit wear and tear and to easily notice the adjustments that need to be made to the sail.

The Technique
The Technique
With a size of about 4 cm2 and a weight of 100g, the E-Telltale® is connected to an electronic system that will be able to interpret its movements at 360 degrees but also its elongation in order to refine the data.
Our E-Telltale® will soon be compatible with the multifunctional screens (MFD) B&G, NKE, Raymarine and Garmin.


Our History
At Trimcontrol™, the E-Telltale® created with the help of Michel DESJOYEAUX is not new : in fact, many versions of the telltale have been tested and improved in order to offer the product in its most functional and adapted version
Our History
Since then, the final version has already been tested by professionals on several famous races: The trimaran MACIF with François GABART, the SMA monohull with Paul MEILHAT , Michel DESJOYEAUX on the famous Vendée Globe, but also on other types of boats such as imo-cases, racing-cruising boats, super-yachts…

Labeling & Awards
Find here all the certifications and awards that the E-Telltale®️ from TrimControl has received since the beginning of its creation.
The TrimControl Documentation


The press talks about it
Click below to access our press review and dive into the articles about us !

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