Chaseh
Contributor
Does anyone know what the buoyancy of the Bio-Fins are?
I started to search but couldn't find a mention of it
Thanks.
I started to search but couldn't find a mention of it
Thanks.
Simple Bio Fins question
- Thread starter Chaseh
- Start date
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Chaseh:
Chaeeh: Apollo bio-fins are 100% natural rubber and are slightly negative in salt water.
bradshsi
Guest
Just for fun I did an experiment in my bathtub to determine the buoyancy of my size large yellow biofins 
The answer is about 0.3 lbs negative buoyancy per fin in fresh water.
Since each fin weighs about 3lb, that equates to about 0.23 lbs per fin negative buoyancy in sea water.
The answer is about 0.3 lbs negative buoyancy per fin in fresh water.
Since each fin weighs about 3lb, that equates to about 0.23 lbs per fin negative buoyancy in sea water.
OP
Chaseh
Contributor
ok, now you've got me curious, I was initially just wanting to make sure my trim wouldn't be outta whack, but how did you figure an exact measure?
bradshsi
Guest
I filled my bathtub and put the biofin in the water (and of course it sank).
Then I simply found some closed air filled containers (in this case some plastic old RX medicine containers). I just tried different sizes of container until I found one that only just caused the fin the float.
By measuring the dimensions of the container, the volume and hence weight of the water displaced can be calculated.
Hey, ok I admit I'm an engineer and that kind of question gets me interested My wife of course thought I was nuts, playing with fins in the bathtub....
Then I simply found some closed air filled containers (in this case some plastic old RX medicine containers). I just tried different sizes of container until I found one that only just caused the fin the float.
By measuring the dimensions of the container, the volume and hence weight of the water displaced can be calculated.
Hey, ok I admit I'm an engineer and that kind of question gets me interested
My wife of course thought I was nuts, playing with fins in the bathtub....
Humuhumunukunukuapua'a
Contributor
I can't imagine why your wife thought you were nuts...
(No, seriously, that's awesome you could figure it out like that!)
(No, seriously, that's awesome you could figure it out like that!)
This brings back memories of high school physics... LOL!
Weight fin outta water, plop fins into a solution of salt water in a tank nearly spilling over, measure weight of salt water spilled and subtract from weight outta water... I think LOL!
SangP
Weight fin outta water, plop fins into a solution of salt water in a tank nearly spilling over, measure weight of salt water spilled and subtract from weight outta water... I think LOL!
SangP
OP
Chaseh
Contributor
pretty cool
You got too much time on your hands! :06: Go diving now!
bradshsi:I filled my bathtub and put the biofin in the water (and of course it sank).
Then I simply found some closed air filled containers (in this case some plastic old RX medicine containers). I just tried different sizes of container until I found one that only just caused the fin the float.
By measuring the dimensions of the container, the volume and hence weight of the water displaced can be calculated.
Hey, ok I admit I'm an engineer and that kind of question gets me interested
Bradshsi: Great information. Thank you. Many divers have reported how they like having the bio-fins stay in the water, particularly when surface swimming. Now we have the hard data. With your permission, we will add your experiment to a FAQ section of our website.
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