Ok, just wanted to let you all know that I shifted a couple of weights to those pockets on the back of the bc and tested it today on a couple of dives. It was an improvement.
Great thread. Thanks.
Great thread. Thanks.
What is Trim?
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alpaj
Contributor
Well if you want to apply some University Physics to it then this center of buoyancy and center of gravity business is bogus. Why? Because they are two vector forces which act on the exact same point in a balanced person. Simply put when the two forces are not in exact opposition you will tend to rotate (by this I mean movement like head up toes down) until the two forces are exactly opposite in direction to each other and thus counteract each other. By this I mean movement like head up toes down.
A person who is kicking can add to either of these forces. By kicking slightly upwards one will add to the gravity portion. By kicking slightly downwards will add to the buoyancy force part. The second one is commonly seen by unbalanced badly trimmed divers. Now what happens when you stop kicking? Now your kicking isn't adding to the CB/CG force (either CB or CG as explained above) and now they will be unbalanced and you will tend to rotate. I think pretty much every one has experienced this when they learned to dive – you stop kicking and your fins go down.
Of course it is obvious that this is undesirable because you will not be kicking all the time and it is undesirable because when you are kicking some of that force is wasted in helping out the buoyancy part or the gravity part.
SOOOOO essentially good trim is when your kicking isn't adding to either of the two components (buoyancy or gravity/weight) because it is inefficient. So now when you have a balanced well trimmed weight you will be in the same orientation in the water column whether you are moving (static) or moving. This is much more efficient. And now if you want to bring about a change in your orientation it is very easily accomplished by slightly changing your kick.
Badly trimmed divers are those divers that when they stop kicking they tend to change orientation in the water. Badly balanced divers are those that are in the same orientation whether they are kicking or not but are not horizontal at either of them. So a well balanced well trimmed diver is one who is horizontal whether he is moving or not. Now if you are well balanced (statically not moving) then good trim will develop from that if you have decent fining technique (i.e. you are capable of fining without adding to either component). On a side note, this is one reason why people like the frog kick.
Having taken ground school for my pilots licence this argument follows the definition of trim in aviation closely.
Good night it's 2 am Hope this helps
A person who is kicking can add to either of these forces. By kicking slightly upwards one will add to the gravity portion. By kicking slightly downwards will add to the buoyancy force part. The second one is commonly seen by unbalanced badly trimmed divers. Now what happens when you stop kicking? Now your kicking isn't adding to the CB/CG force (either CB or CG as explained above) and now they will be unbalanced and you will tend to rotate. I think pretty much every one has experienced this when they learned to dive – you stop kicking and your fins go down.
Of course it is obvious that this is undesirable because you will not be kicking all the time and it is undesirable because when you are kicking some of that force is wasted in helping out the buoyancy part or the gravity part.
SOOOOO essentially good trim is when your kicking isn't adding to either of the two components (buoyancy or gravity/weight) because it is inefficient. So now when you have a balanced well trimmed weight you will be in the same orientation in the water column whether you are moving (static) or moving. This is much more efficient. And now if you want to bring about a change in your orientation it is very easily accomplished by slightly changing your kick.
Badly trimmed divers are those divers that when they stop kicking they tend to change orientation in the water. Badly balanced divers are those that are in the same orientation whether they are kicking or not but are not horizontal at either of them. So a well balanced well trimmed diver is one who is horizontal whether he is moving or not. Now if you are well balanced (statically not moving) then good trim will develop from that if you have decent fining technique (i.e. you are capable of fining without adding to either component). On a side note, this is one reason why people like the frog kick.
Having taken ground school for my pilots licence this argument follows the definition of trim in aviation closely.
Good night it's 2 am Hope this helps
alpaj
Contributor
Sorry I didn't mean that CB CG is not applicable but saying that one should think about one without thinking of the other is bogus. That is what I meant sorry for that.
alpaj
Contributor
By kicking slightly DOWNWARDS one will add to the gravity portion. By kicking slightly UPWARDS will add to the buoyancy force part.
Essentially good trim is when your kicking isn't adding to either of the two components (buoyancy or gravity/weight) since this is more EFFICIENT.
:11doh: Lesson: No amount of Spell check can clear the late night fog
Essentially good trim is when your kicking isn't adding to either of the two components (buoyancy or gravity/weight) since this is more EFFICIENT.
:11doh: Lesson: No amount of Spell check can clear the late night fog
OP
NCSCUBADOOBA
Contributor
that site is perfect!!!!!!!! thank you 
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