Posts by Dan

Quote from straight shaft

I always thought the same thing! It should have been called the Sturgeonsub.

That's cool, I didn't think too many people would recognize the movie, I remember seeing it in the theater as a child. It was a big deal to me because I loved the book.

The sturgeon is a beautiful fish that reportedly can live more than a hundred years. The very expensive caviar comes from the roe of these fish. The largest is the Beluga sturgeon which can reach 7meters (24 ft) and 3000lb.

Some more White Sturgeon pics.

Not at all complicated, it may seem that way if you've never used sound editor software. This program is WaveEditor. It comes included with Nero burning suite so most people have it and don't even know it. I'm sure there's free sound editor software that represents data in a similar way. You can see from the pic that the peaks are where the sound level goes up. In a speargun shot recording you'd see mostly a flat line beginning and ending with a noise spike/peak. You can easily select a portion of the graphical representation and the time appears on the bottom where I circled. You can also zoom into the graph, where half a second would take up the whole screen. This enables you to select precisely where you want to know the time.

To make the whole thing even less complicated I could use my digital camera with its underwater housing to make a video recording which includes sound. This can be done while actually shooting a fish in open water. The sound data from the video can easily be treated in the same way.

I don't really care about the speed with which the spear leaves the speargun as a number but I thought the following was brilliant.

Quote from wkitto

Put a cheap microphone into a condom --- tie it off so the mic doesnt get water in it. Connect the mic to a laptop and put it (the mic since you still may not be thinking) into a pool where the gun will be shot at a wooden target suspended off the bottom by strings to your weight belt. Accurately adjust the distance from the end of the shaft to the target (15 to 20 ft for example) and with the computer recording shoot. Review the digital image of the sound in a sound editing program to measure the time distance from the sound of the mechanism and bands going off to the impact of the shaft at the target. From that point with a little engineering help you ought to be able to figure the average velocity over the distance traveled.

kitto
http://IC_Spearguns.tripod.com

I don't see the point of those finlets. Fins without water channeling rails slip over the water on the down kick. The less rail you have the more you will feel this effect. The only downside to the rails is difficulty with sculling movements, but as freedivers using long (carbon or fiberglasss) blades we avoid those movements anyways.

I haven't seen it but what's the logic behind it? There's been all kinds of gimmicks on the market to attract attention including little finlets glued in the middle of the blade.

This fish reminds me of Captain Nemo's submarine, the Nautilus.

I don't think it's properly ballasted. Also the barbs don't appear to be tuned. For that kind of money I'd expect it to function perfectly right out of the box :angry5:

Quote from Gonzo

That's basically what I thought when I saw that machine.

Gracias.

I noticed a difference between a wood and an epoxy track letting the shaft slide out of the track out of the water, the epoxy is more slippery but makes more noise. No difference in the water.

Quote from Gonzo

Equalizing would be a major issue for me. There are nose clips like the ones free divers use.

Would you dive without a mask or use fluid goggles?

Quote from Gonzo

For underwater exploration I can't imagine anything that provides that kind of agility and movement short of getting gills and a dolphin tail.

Really? How would you equalize on a descent?

What a cutie, nice patio too.

Good luck with the sale.

Sounds great!

Any pics of the table? What time were you back from diving? What did you guys do at night?

Gerald, welcome back Nice colorful deck, thanks for sharing.

Well there aren't many that can be found, I feel a little lame posting other peoples pics but it's better thant nothing. Maybe Pantoja will add some.

I can't believe you didn't want to try the tarpon. Did it have a lot of little bones as I recalled?

Pucho, The reasoning behind the partial epoxy enclosed track is to prevent the front of the track from splintering if force is applied upwards on the shaft right? I've experienced this splintering effect already on my current gun, it doesn't have this protection. However I don't like to mess with epoxy if I can avoid so for my next gun I'm going to use two steel plates screwed down at the end of the track to trap the shaft and prevent upward movement. I hope it will work as I've never seen it done before.

Quote from FREEK

Made me start wondering what that tarpon and ray taste like?? Anybody??

I remembered that I bought tarpon once. The fish was big and very bony. Made filleting almost impossible. Would be good for soup and croqueta. I don't remember the taste but remember making a note to myself not to buy it again. If anyone has experience with tarpon they can confirm.