NJMike:
Rev. Blade...
Never had a sausage or SMB but will be getting one next year. So I'm having trouble visualizing your description of the handle.
Can you give another description...again? Describe how it would be used without the handle...crumpling the bottom...holding the open end underwater...all Greek to someone who hasn't seen and/or used one before. (No offence to any Greeks out there, they are some of my favorite people!).
So you manufactured a handle out of duct tape...okay, but for what purpose? When the boat captain said it worked really well, how would he know since you would have used it in the water?
You can tell by my questions that I am clueless! Maybe you can include a pic or two?
If you have a container that is sealed at the top and sides, it will float if the volume of water it displaces weighs more than the container and the contents. My cheap plastic sausage weighs just about nothing, so it will float if I get any gas inside it. Mine is just a long plastic tube, that was sealed at one end. If you get some air in it, the bubble will rise to the sealed end of the tube. If I hang onto the open end (crumpled or not), and keep the open end below the surface of the water... all the air stays inside the tube. If you keep enough of the tube under water that the air bubble gets pulled under water, lift pressure builds in the tube.... That lift pressure could be used as a lift bag if your sausage were strong. (My plastic tube is not built for that. The plastic seams would pop.) If you only submerge a small portion of the air trapped in the tube, you can make the tube stand up straight out of the water (because the air would need to go deeper to get out the open end, if the open end is deeper than the air bubble. All the floats with an open bottom work that way. The main thing that's "special" about mine, is how cheap it is. (price and quality)
To make a handle, I simply opened the tube, and ran some tape from the inside of the tube (sticky side out), about 10" down below the tube then back up to the inside of the tube. That gave me a loop of tape that was stuck to the inside, and a sticky mess hanging below my sausage. Then I ran some tape from the outside of the tube (sticky side in) to overlap the tape. Then I ran some tape around the base of my tube, to keep the other tape from comming undone when it got wet.
To give you an idea how it all works, if you've never used one... let's reverse the bag idea, and use it on land....
If you take a sack (SMB), and drop an apple in it (air bubble), the apple stays in the bag as long as the open end stays above (below, if it were a SMB) the apple.
If that example made any sense, we can talk about why bother with a handle.... You could hold your "apple sack" by crumpling up the sack, and grabbing on, but your hand will get tired, because you need to grip the bag so tightly. (Not to seal it, because the apple won't jump up out of the bag... you hold on tightly to keep the bag from falling to the floor (floating to the surface if it were a SMB... remember the "apple sack" is like an upside down SMB). If you try to carry a sack with a handle, you quickly notice how much easier it is to keep a grip. It doesn't matter if the sack hangs open at the top or not. The same way a SMB can be open or closed at the bottom. (I hope that made some sort of sense....)
So how could the captain know how well my sausage worked? He simply saw that the tube deployed somewhat smoothly at the surface. I put a small amount of air in the tube (filled perhaps one foot of the tube), while I was at my safety stop. My tube is 10 feet long, and held above my head from a 10" handle, so with about a foot sticking out of the water... I was still at a good depth for my stop. When I was ready to surface, I simply added a bit more air to the tube. (When I had 3' of air in the tube, I was hanging about 8' deep.) Add a bit more air, and come up a bit more. By the time I wanted to be on the surface, I had about 9' of tube stickinng out of the water, and a foot of tube held underwater to keep the pressure on the tube to hold it upright.
So the captain saw a slow rise to the SMB, and eventually saw me. Partly he seemed impressed, but I imagine he partly just didn't want to say my tube looked super cheap. (It does look cheap, but it never pays to insult your customer's gear.) Oh yeah, did you notice I said my cheap tube is 10' tall? He also noticed it was
easier to see my 10' tube than his wife's 48" tube.
I hope that helps, more than it hurts. I tried to attach a photo, let's see if it works.