Rolex Report

[Flyjet601]

I was reading the Rolex Report and on pg. 195 talking about the SUB and Seadweller it mentions that "the crown should never be unscrewed when submerged, as this will flood the case". I think the book is wrong.

My understanding is that the watch is still waterproof with the crown unscrewed.....is it not?

But it raises a question for me......with the crown unscrewed, is it still guaranteed to its depth rating?

So can a SD still get down to 4000 ft and be waterproof?

Thoughts

[leopardprey]

From what I understand, the case only becomes waterproof once the crown in locked down. That creates the seal.

[christo]

Yeah, the book is wrong. Go ahead and go diving to 100 feet with the crown unscrewed. It will be fine. Please report back to the forum on the accuracy of the book.

[davor]

there is no way that ur watch is going to survive even a swim with the crown unscrewed...

[Flyjet601]

Originally Posted by christo

Yeah, the book is wrong. Go ahead and go diving to 100 feet with the crown unscrewed. It will be fine. Please report back to the forum on the accuracy of the book.

...nothing useful to say...then don't say it


here you go

http://www.rolexforums.com/showthrea...wed+waterproof

[montecristo]

I can only imagine the crown is like the cap on the soda bottle, when you unscrew it you break the seal until you screw it back tightly.

Remember when people say that make sure you screw the case back tightly after you open the screw down case back so water won't get in? Similar idea.

[tonelar]

Supposedly, with the crown unscrewed the Rolex oyster goes from water proof to water resistant... meaning there's at least one seal that is still functioning with the winding stem unscrewed.

Screwing it in, gives the watch 2-3 more barriers* and it's water proof rating.

So with new seals, the watch crown unthreaded still affords you some water resistance (in case you get splashed while setting your watch sitting on your dive boat), but you'd be foolish to immerse it with the crown unscrewed.


*the Triplock seals in three spots / one of those places by double o-rings.

[Flyjet601]

Originally Posted by tonelar

Supposedly, with the crown unscrewed the Rolex oyster goes from water proof to water resistant... meaning there's at least one seal that is still functioning with the winding stem unscrewed.

Screwing it in, gives the watch 2-3 more barriers* and it's water proof rating.

So with new seals, the watch crown unthreaded still affords you some water resistance (in case you get splashed while setting your watch sitting on your dive boat), but you'd be foolish to immerse it with the crown unscrewed.


*the Triplock seals in three spots / one of those places by double o-rings.

Thanks Tonelar....thats what I thought. Hence the triplock name(3 locks)
So what I read in Rolex Report is obviously in error. Althought the watch would not hold up to its depth rating, if I went swimming by accident with the crown unscrewed...I would not be screwed as the watch would not be flooded as reported.

[tonelar]

Originally Posted by Flyjet601

Thanks Tonelar....thats what I thought. Hence the triplock name(3 locks)
So what I read in Rolex Report is obviously in error. Althought the watch would not hold up to its depth rating, if I went swimming by accident with the crown unscrewed...I would not be screwed as the watch would not be flooded as reported.

Take care...

I don't know about swimming... remember, even if you are only on the surface... you are moving your hands and arms through the water. So the water pressure is (in a sense) increased against the single seal on the watch. I think water resistant means that you should be covered if you forget to thread it in all the way and it slides into a sink full of water. Another scenario might involve setting or winding your watch outdoors while it's raining.

[Alcan]

As mentioned, the depth rating is for static water pressure. Movement increases the pressure against the watch. The TripLock crown seals are shown in red below. With the crown unscrewed, there's just the double O-rings between the crown and tube. I'd venture to say that it'd still be water resistant, but not waterproof.

[leopardprey]

So what about the twin locks on the Exp and GMTs?

[Flyjet601]

Originally Posted by Alcan

As mentioned, the depth rating is for static water pressure. Movement increases the pressure against the watch. The TripLock crown seals are shown in red below. With the crown unscrewed, there's just the double O-rings between the crown and tube. I'd venture to say that it'd still be water resistant, but not waterproof.

Great diagram Alcan.....thanks.

Here's is something I want to throw out.....

There is certainly smarter people on this forum than me, but......

"Bernoulli's Law" states that when the velocity of a fluid increases, its pressure decreases. So if I was to move my watch thru the water, the velocity of the fluid(water) would increase over the surface of the watch, therefore if Mr. Bernoulli is correct........would the pressure of the fluid not decrease??? Laws of Physics dont lie...

Can we change the water pressure by moving our watch thru water?

[nko51]

Basic rule even when rinsing a Rolex off is to first make sure the crown is screwed down.

.......................--::**::--..Rolex Forever..--::**::--.........................
................I KNEEL IN THE LONG SHADOW OF IT'S GREATNESS.............

[leopardprey]

BUt if you move your hand thru the water, the water velocity is not increasing, you are increasing the velocity of your movement.

?????

So where are the Physic Majors?? We need one!

Good question Flyjet.

[Alex Stylianou]

Mind You , You Have to say thats a nice easy way to break a rolex

[quinson418]

Originally Posted by Flyjet601

Great diagram Alcan.....thanks.

Here's is something I want to throw out.....

There is certainly smarter people on this forum than me, but......

"Bernoulli's Law" states that when the velocity of a fluid increases, its pressure decreases. So if I was to move my watch thru the water, the velocity of the fluid(water) would increase over the surface of the watch, therefore if Mr. Bernoulli is correct........would the pressure of the fluid not decrease??? Laws of Physics dont lie...

Can we change the water pressure by moving our watch thru water?

Bernoulli's Law is correct but I believe that there is a slight misinterpretation.
When you are moving your watch through the water, the water pressure does not decrease since water velocity is not changing at all.
Moving your watch in the water, and having the watch velocity change is a whole different issue, kind of like you running really fast and seeing the trees passing your fast as well, yet the trees are not moving.
That is due to a different frame of reference, the same reason why Sir Issac Newton's Newton Law is not always true compared to Einstein's Law of Relativity.

Anyways, when the depth really matters to your watch, the water down there is pretty much still, just like when people say "Still water runs deep"...NOT.

Hopefully this kind of helps out, correct me if I am wrong.

[tonelar]

Originally Posted by leopardprey

So what about the twin locks on the Exp and GMTs?

Twin locks have the same system minus the o-ring on the outer edge of the tube.

Originally Posted by leopardprey

BUt if you move your hand thru the water, the water velocity is not increasing, you are increasing the velocity of your movement.

?????

So where are the Physic Majors?? We need one!

Good question Flyjet.

The (effective) water pressure is increased against your hand as it and the watch experience drag while moving through the water. I believe Bernoulli's Law is in reference to the pressure of water acting against it's confines as when flowing through a pipe or other means of containment.

I guess this is why Rolex is conservative with their depth ratings. The act of swimming or moving at any given depth actually places more pressure on your seals than remaining static at that depth.

[Alcan]

Originally Posted by leopardprey

So what about the twin locks on the Exp and GMTs?

.

Here you go. Similar to the TripLock but without the O-ring on the outside of the tube.

[Flyjet601]

Originally Posted by leopardprey

BUt if you move your hand thru the water, the water velocity is not increasing, you are increasing the velocity of your movement.

?????

So where are the Physic Majors?? We need one!

Good question Flyjet.

The "relative velocity" is increasing.....thats how airplanes fly, moving the wings thru the air.

[Flyjet601]

Originally Posted by tonelar

Twin locks have the same system minus the o-ring on the outer edge of the tube.






The (effective) water pressure is increased against your hand as it and the watch experience drag while moving through the water. I believe Bernoulli's Law is in reference to the pressure of water acting against it's confines as when flowing through a pipe or other means of containment.

Bernoullis principle doesnt not restrict itself to water or the confines of a tube. This is the main reason why an aircraft can get off the ground, and aircraft dont fly in tubes. Moving an object(plane) thru a static fluid(air, unless its windy, but it doesnt matter) and a realtive low pressure(vs under the wing) created over the top of the wing, Bernoulli "da man"....presto...you go up.

[Flyjet601]

Originally Posted by adstylianou

Mind You , You Have to say thats a nice easy way to break a rolex

I think you have missed the point here.....

[Alcan]

Originally Posted by Flyjet601

Moving an object(plane) thru a static fluid(air, unless its windy, but it doesnt matter) and a realtive low pressure(vs under the wing) created over the top of the wing, Bernoulli "da man"....presto...you go up.

And if you make that wing out of Kevlar and stand it on it's end, you have my sails.

[Mrdi]

"And if you make that wing out of Kevlar and stand it on it's end, you have my sails."
Alcan

And upon what vessel are these standing?
Type, length, munufacturer, one-off, designer, etc?
Thanks,

Mrdi

[DIVER4USN]

Every 33 Fsw Adds An Additional Atmospheric Equivalent To The Ambient Pressure. There Is No Fu--in Way That You Can Think That The Watch Should Be Waterproof (other Than The Shower) With The Crown Unscrewed. Common Sense Is Authorized!

[Alcan]

Originally Posted by Mrdi

"And if you make that wing out of Kevlar and stand it on it's end, you have my sails."
Alcan

And upon what vessel are these standing?
Type, length, munufacturer, one-off, designer, etc?
Thanks,

Mrdi

Just a little guy, Ranger 22.

[leopardprey]

Nice looking boat!!

[Flyjet601]

Originally Posted by Alcan

Just a little guy, Ranger 22.

Nice boat

[leopardprey]

I think you need to get a Rolex Yacht Master if you already do not own one!

[Alcan]

Originally Posted by leopardprey

Nice looking boat!!

Originally Posted by Flyjet601

Nice boat

Thanks, guys. That boat and I have been through a lot together. This year marks 25 years that I've owned it, and I've put over 10,000 miles on it.

[Alcan]

Originally Posted by leopardprey

I think you need to get a Rolex Yacht Master if you already do not own one!

I'd sure like to own one. It's my favourite Rolex sports watch. I'm sort of wishing I'd bought one instead of my TT Sub.