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Fishing Line Angle Device





Dennise
Many fishermen would like to know the depth of their lures while trolling. One (cheap) way to do this involves measuring the angle of the fishing line where it enter the water. I'd like to devise a way to do this.

The solution needs to be accurate at small angles (up to say 15 degrees). Also, it must take into account the movement of the boat in waves and wind. In this case, the instantaneous angle is unimportant. what is needed is an accurate average measurement when one's boat is bouncing around in waves.

Does anyone have any suggestions how to get such a measurement accurately at reasonable low cost ... say less than $25?
ocalhoun
Dennise wrote:

Does anyone have any suggestions how to get such a measurement accurately at reasonable low cost ... say less than $25?


Sure.

Build a fishing reel with a odometer in it. That way you can simply set it to zero when the line is reeled in, and when you reel the line out, the reading on the odometer will be how much line has played out.
Construct it in such a way that reeling in reverses the odometer, of course, so that you only need to re-zero it when you cut or break the line.

The only difficulty is building it to be very low friction, so that it won't interfere with casting.

For a moving boat, you need to somehow connect the odometer reading and a reading from a speed sensor. The ratio of line length/speed/depth should behave according to a set formula that could be calculated with cheap electronics.


So, in total, you have a three part system:
1- Speed sensor on boat, could be sold as a user-installed add-on, or built in. Use RF transmitter to send the speed reading to unit number (3)
2- Odometer built into fishing reel. It would probably be best to convince reel manufacturers to install this option at the factory and market it together with kits for (1) and (3).
3- Display unit. Could be stand-alone or built into the reel along with (2). Receives the speed reading by RF, and the line-length reading by wire or RF, then calculates line depth according to a relatively simple formula, then displays it.

Mass produced, that might be manageable for under $25. It could certainly be done for less than $25 wholesale, with a retail markup to around $80 for a complete system.

Helpfully, multiple (2) and (3) units could receive the same signal from a (1) unit. So, if multiple fishers on one boat use the system, only one speed sensor need be installed, making the cost-per-fisherman lower.

------------------------
More improvements:

*Let the (2) and (3) units operate even if no (1) unit is present, that way, stationary fishers can also benefit.

*Perhaps consider adding a timer function to the (3) unit, so it can calculate (approximate) depth for anglers who cast and reel in continuously. (Though line length stays the same after casting, the line may sink slowly.) This would be difficult though, because the weight of the bait/tackle/etc. would affect how quickly the line sinks.

*Have a cheaply made version, but also a high-end version that uses rechargeable batteries, more durable components, and better waterproofing. Sell each under different brand names.
Dennise
ocalhoun wrote:

The ratio of line length/speed/depth should behave according to a set formula that could be calculated with cheap electronics.




Line out (existing line odometers exist today) and speed (via GPS) are easy. But such a line length/speed/depth relationship is very complex and has many many variables .. e.g. line weight and diameter, lure drag, weight and style of lures.

To a pretty good approximation, the line angle to the water (which is what I asked about), together with a little trigonometry, will give the depth. but how to measure the line angle to water surface cheaply?
ocalhoun
Dennise wrote:


To a pretty good approximation, the line angle to the water (which is what I asked about), together with a little trigonometry, will give the depth. but how to measure the line angle to water surface cheaply?

A float that the line passes through (easily), but which measures the angle of gravity pulling on a small weight inside it.

As the line slants, it will cause the float to tilt (because the line passes through the float in an open, drinking-straw-like hole).
Simply measure this tilt with a tiny inclinometer, and you have your angle. You'll need to average it because it will be bobbing on small (or not so small) waves.
*If you could build a line odometer into the float as well without giving it too much resistance, you could build it all into one unit. Perhaps an electronic one that counts metallic bits embedded in the special line at specific intervals?
*Build a display into the float, to make it completely self-contained. A rudder-like shape on the back of the float could keep the display pointed at the fisherman.

It will still only be approximate though, because the line may curve some, again depending on weight and drag of the tackle, as well as speed.

However, the special fishing line with metal bits along with the float (that has a built in electronic odometer, inclinometer, and display) could easily be mass produced for under $25.


*Why didn't I think of that the first time?*
*I really need to spend some time brainstorming before running away with the first solution that comes to mind.*
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