Speed of current

[nereas]

You mean like this:

Test diver Riza Lacour burns up the speed course, measuring a fin's top speed with a digital underwater speedometer.

WOW! Can we zoom in please?

 

[nereas]

According to Thalassamania's numbers it's about 6' in 3.5s or almost 17' in 10s. 6' in 10s is well under half a knot.

Exactly right!

I think that if you listen to Thal you would never go wrong.

Although I myself tend to dive much more conservately than he does.

But then again he has routinely been places that I would never on this Earth ever go.

 

[boulderjohn]

I primarily rely upon my extensive powers of exaggeration.

 

[Thalassamania]

Wish I could zoom, here's the link.

 

[nereas]

Good advice above.

Yes, there is such a device, but it requires you to have it anchored (as a reference point). I have no idea what the US Navy paid for them, but it had to be insane.

You could easily jury rig a simple version with any hinged pointer airpseed gauge, like the kind that are on back yard rain gauges. Test it, measure it and move it underwater in a swimming pool. Calibrate it like that.

In Tobago, we actually laser measured a chute called "The African Express Turnoff" and then timed it. I recall it was approx 4.5mph and we tumbled thru it.

You are hereby drafted into the DDs as well !!!

 

[nereas]

Wish I could zoom, here's the link.

Wow that zoom now works great! All we need to do yet however is somehow fix that pixel resolution problem.

This is precisely why I love visiting Florida, where the babes actually do scuba dive in bikinis.

 

[Thalassamania]

Wow that zoom now works great! All we need to do yet however is somehow fix that pixel resolution problem.

This is precisely why I love visiting Florida, where the babes actually do scuba dive in bikinis.

And it appears don't know who to fasten their tank to their BC.

 

[nereas]

I primarily rely upon my extensive powers of exaggeration.

I have to believe the currents in Colorado are not that bad, unless of course you are diving near a dam, and then they open the flood gates on you.

In which case you are not going to have time to get out your pocket current meter and measure your speed into h.e.l.l. .

 

[Thalassamania]

In which case you are not going to have time to get out your pocket current meter and measure your speed into h.e.l.l. .

It would, of course, read zero since you're moving with the current.

 

[Doc Intrepid]

I use Doc's Rule of Reduction:

1 - 2 knots = Wuss diving - standard operating procedure

3 - 4 knots = Pretty rippin'

5 - 6 knots = Watch your mask

> 6 knots = Stay on the boat and drink boat drinks

I don't bother with the math.