Way to measure speed of a DPV during diving

[ronk_1976]

Hi All,

I have some LeFeet P1 DPV's and would like to measure/display speed during diving. Ideally with depth and compass indication as well. Anybody any ideas on how to realize that?

Would already be happy with relative speed vs water...but absolute speed would be even more desirable.

 

[Capt Jim Wyatt]

Lay out a measured course. 100 yards/meters. Run it & time it.

 

[tbone1004]

absolute speed is effectively impossible as you have no reference to anything fixed while diving.
Relative speed would require a separate device similar to the way they use a pitot tube to get air speed in aircraft but IMO that's not terribly useful information because it only tells you relative to the water. Without knowing how fast the water is moving you have no sense of how far you've gone. Data, Analytics, So What? Not sure what the "So what" part of that would be.

If you just want to see how fast they can go under certain conditions then search for "Tahoe Benchmark 2011" and you can see how they laid out a course to measure DPV speeds under different conditions. If you get your general configuration squared away and set up a 100ft course you can get the fpm or mpm of you diving in your configuration at certain speed settings and then just use time to get a rough approximation of how far you've gone.

 

[jadairiii]

Hi All,

I have some LeFeet P1 DPV's and would like to measure/display speed during diving. Ideally with depth and compass indication as well. Anybody any ideas on how to realize that?

I dont think any company makes a stand alone computer that does what you are asking. (but I could be wrong) Suex has the Enron computer that requires the Sinapsi nose cone add on to the Suex scooter that will give you all of that data. But, obviously, you need a Suex scooter.

Eron : Full control over your browsing - Suex

Eron D1-Connect is much more than just a computer. Through the wireless connection with the scooter, it can provide data that was previously impossible to obtain.

www.suex.it

 

[gmerick]

Attach a Garmin InReach Mini to a dive buoy.
Tow the buoy on a dive.
I have several tracks recorded this way in the "Where did you Solo dive today" thread.
I've used it to track time and distance for frog vs traditional kick. It's a good indication of ocean current strength. I also use it to mark underwater features (swim a 20 ft "X" over a feature and note the dive time).