ZenLoch, Loch boat 3rd millennium

After sextant future (¹), presented at the Paris Boat Show in December, here is the log of the future revisited by a "Professeur Tournesol" electronics engineer and inventor of Nantes engineering.

The oldest among us will certainly remember this venerable and inexpensive instrument of old sailing ships : le « loch à bateau ». Quote (²):

The "boat" is a wooden board, ballasted to float vertically and connected to the line by a loch bridle. On the line of nodes is made, spaced in principle of 7m72 (is 1/240e nautical mile). It puts the "Ship To" water and let slip the line. Then there are, from the first node, how many nodes pass in hand 15 seconds, which gives the speed in knots.

You can not get any easier, and to compensate for the slight training of the board when the log file line, can slightly reduce the node spacing (7m50 eg) to ensure measurement accuracy.

Montage du loch à bateau. La pince à linges sert à ramener la planchette en tirant un coup sec sur le fil. (Illustration : Nouveau Cours de Navigation des Glénans 1972)

Mounting the loch boat. The clothes peg is used to bring back the board by pulling a sharp blow on the wire. (Illustration : New Course Navigation Glénans 1972)

A laser counter

The creator, who contacted me and requested anonymity before the publication of a global patent, had the idea to highlight this ancestor marine instruments to associate a particularly nifty little device : a counter nodes laser rays, powered only by solar cells miniaturized latest generation.

The principle is to pass the line of nodes loch boat, installed on a fixed spool reel fishery, through his camera, a bit like a big halyard lead, and to count the nodes by the integrated laser. An electronic board controls the voltage of the line to pass through the machine to automatically compensate for the training factor clipboard and provides a perfect measure, 1/100th of a node. We can therefore keep the exact spacing of nodes 7717 mm. Display a full-day presents the data, and NMEA interface 0183 allows a link with a multiplexer, or to a repeater dial.

Le prototype du ZenLoch

The ZenLoch prototype™

Fully self-sufficient in energy, as reliable as electronic log, this set, baptized ZenLoch™ by its designer, comes complete with boat log in unalterable fluorescent yellow Panostrat, the clothes peg is replaced by a stainless steel clip, the nodes are replaced by micro-balls crimped on the cable. It should appeal to followers, more and more, energy self-sufficiency and zero CO ². Especially since the price should not exceed the 35 to 40 € in direct Internet sales. Formidable, isn't it ?

I am always impressed by the inventiveness of my young fellows, and I look forward to seeing this little gem finalized.


(¹) G-Stell sextant future
(²) New Course Navigation Glénans – 1972

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8 Replies to “ZenLoch, Loch boat 3rd millennium”

  1. sympa le fish..
    and especially a big hello to you Francis.. whose advice helped me out well in Pornic there is already time.. a good memory.; a beautiful journey.. wait for the next..

  2. Fabulous !
    Is it provided a system of catapulting the clipboard with reel automatic withdrawal, all this run on iPad ? By putting one on each side, and with good synchronization, this would allow a continuous measurement of the speed. Si possible en NMEA2000 😉

  3. Thank you very much, M. FUSTIER, for this amazing information. But I suspect you receive royalty on the sale of this fantastic invention.
    BUT, this fabulous device will he also count heads nodes piling in departments ?

  4. can it be set to get a hand-held probe, whose nodes are all meters ?

    When wet by 3 or 4 meters, I still have a doubt having missed a node, obliged to repeat the measurement. Then, new doubt : currently he rather 3.40 m ou 3.60 ?

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