Powerhead

rigdvr · Sep 15, 2002

It seems my translater program is not working correctly or something...I thought we were talking about spearfishing!?!?!?!?

Murat · Sep 15, 2002

Re: keepin it simple..

Originally posted by andrsn

is the glass half empty or half full? pessimist: half empty; optimist: half full; engineer: twice as big as it needs to be!

I am hearing it always and everytime i can`t stop myself to accept it.Thanks for the little engineering philosophy

Shadowkiller · Sep 16, 2002

Re: keepin it simple..

Originally posted by andrsn

is the glass half empty or half full? pessimist: half empty; optimist: half full; engineer: twice as big as it needs to be!

Who cares? Its time for the next round!

Just thought I would add an Aussie engineers perspective...

Griff · Sep 16, 2002

sparky 1, 2 and 3...

The reason for my interest in the electronics is also to make a fish attractor. i once tried a "vibrating flasher" (sounds like a porn product). I didnt have a randomly activated switch though, and because i didnt want a constant vibration ( i thought it would sound too boring) i used a wire lead with a hand operated switch. it worked ok, attracted a small blacktip, before imploding at depth.
it would be bomb to have a 100% sealed unit that i could dangle off a line instead. maybe phase two will have some led's. any ideas for colour?

i dont know if its illeagel here, i dont know if they have even thought about it, after all, we've only have computers for five years now, hey murat

Mark

and while we are on engineer jokes, hows this one.
Two engineers walking down the road, one pushing a bike.
E1: where did you get the cool bike?
E2: this gorgeous girl rode up to me on this bike. jumped off, tore off all her clothes and shouted " take what you want!"
E1: yep, the bike was a good choice, chances are that her clothes wouldnt have fitted.

Shadowkiller · Sep 16, 2002

Well Andrsn I have yet to meet an EE with a ferrari but point taken

Griff: What you want is the motor and weight out of a mobile phone vibrator unit. Thats what is also used in a.. ahh.. "real" vibrator

Use a slide switch (under a rubber cover) to vary the voltage supplied to the motor and thus its frequency of vibration. You would have to play around a bit to find what frequency is best. If you want variable off/on control then a 555 timer circuit may be best. Slap it into a plastic case with the motor bolted to the inside so it can transmit bit vibrations.

A vibrating lure sounds like a good way to attract sharks...:hmm

andrsn · Sep 16, 2002

amplitude...

just go get a vibrator and pull it apart. the motor is much bigger than the cell phone ones. find a waterproof flashlight of similar size and reroute your battery wires so you can epoxy in the motor and still fit some batteries. set your switch to simply turn on the motor. you can adjust the frequency by soldering in a select resistor in series w/ your motor.

there's a trick to not attracting sharks. this is what i'm working on right now, and the trick is amplitude and transmission(just to give you guys a head start ).

.........................
3 engineers were sitting around downing some pints when the topic of what kind of engineer was god came up. the first said he's got to be a mechanical, cause look at all the meticulous details he put into the physiology of the body. you've got incredibly efficient joints and hinges and only two legs are supporting this huge mass w/ perfect balance. yep, he's gotta be a mechanical.

the other said he's gotta be an electrical, cause the body operates off low voltage control impulses which are flawlessly transmitted between neurons throughout the entire body. the heart is biorythmically controlled w/ electrical signals, and the entire body can be compared to a power plant.

the third said, no you guys got it all wrong... he's definitely a civil. who the hell else would put a toxic waste line through a recreational area?!

andrsn

Murat · Sep 16, 2002

Originally posted by andrsn
amplitude...

there's a trick to not attracting sharks. this is what i'm working on right now, and the trick is amplitude and transmission(just to give you guys a head start ).

andrsn

Yea right.Lets say some waves with x amplitude and with x frequency can be used either scare the shark or attract whale.Each species has different comminucation waves.Did you get the point?Probably your fish attractor will attract some kinds of fish.They may even scare the more fish than they attract.You must be carefull when deciding about the amplitude and the frequency ofthe wave.

andrsn · Sep 16, 2002

Originally posted by Murat
You must be carefull when deciding about the amplitude and the frequency ofthe wave.

THAT'S WHY IYA AND I LOVE TO FALSIFY OUR THEORIES SO MUCH!!!!!! otherwise, where'd be the fun, eh?

andrsn

Iyadiver · Sep 17, 2002

OK OK I'M Guilty

Shadowkiller · Sep 17, 2002

Well a bit of applied knowledge and observational deductions give us some indicators:

Low frequency noise brings in marine predators. This includes struggling fish vibrations. (This is what we want!)

Frequencies up to those produced by outboard motors seem to either attract sharks (possible pavlovian repsonse) or have little effect.

High frequencies (above human hearing) scare away predators. More than likely this is due to the sensitivity of the caudal nerves (fish in general) and electricity sensors (shark).

Amplitude should only come into it where signal attenuation has to be considered. After all amplitude is just "loudness" (for the normal people around here).

Low frequencies travel better in water (whale heart beats can be heard by the pacific hydrophones) but amplitude may have to be restricted to avoid attracting every shark in the nearest 200 mile radius.:hmm

Anything that mimics "dying fish" vibrations will be a winner. Add a matched clear LED flashing onto a reflector (like a downlight reflector) and we have a serious fish pager...

andrsn · Sep 17, 2002

Originally posted by Shadowkiller
After all amplitude is just "loudness" (for the normal people around here).

how about "intensity" since loudness refers to the audible range of us humans and these fish aren't wigglin that fast.

shadow, email me if you want to discuss this. i've got some interesting ideas about how to do this, and i'm sure i'd like to hear what you have to say.

cheers,
andrsn

Iyadiver · Sep 17, 2002

When the fish attractor is ready, I can test for you . If in my barren area it can attract fishes............wheewww.......in ur area I think even the "mermaid" want that kind of vibrator

sp1 · Sep 17, 2002

hi, does anyone have any idea on how to make your own powerhead, any pictures, ideas or anything??

Griff · Sep 17, 2002

The motor i used for my vibrato-flasher was from a casset deck. i had a zipper head thingy (the bit that you pull up and down) attached to the shaft. it worked very well because the head of the zipper was hinged to the pulling tab thing so the varied vibrations varied a lot with different motor speed. i figured that this would be like a fish's death manouvers . the box i put it in was moving accross the floor, it was vibrating so much.
i had a 5m length of cable that had a switch which i used to give random vibrations. i figure that a constant signal may sound too mechanical to the fish, but maybe i'm giving the fish too much credit
andrson, I was also thinking about using a torch for a casing, but was wondering if it would lose a lot of effect because of the curved surface would disperse the energy in all diections. a flattish surface that projects the waves out horizontally would be more effective, but how to make it easily is a different story.

Mark

An engineer, a lawyer and a docter were all playing golf. ahead of them was a four-ball that were taking ages. the three were getting quite impatient when the club manager walked past them. the lawyer called the manager over and complained about the slow pace of the four up ahead.
the club manager told them that they are four firemen who lost their sight whilst putting a fire out at the clubhouse. since then the club has allowed them free rounds of golf.
all three were quite shocked at this news. the lawyer said that when he got home he would investigate the case and maybe would get some more money out of the insurance claim. the docter said that he would go home hand look into surgury that may restore their sight.
the engineer said " why cant they play at night?"

andrsn · Sep 17, 2002

griff... you need to position the motor at one end, pointing out. the next step is devising a mechanical transmitter to deliver the vibrations.

a non-locking switch(maybe push button) would be useful for intermittent pulses. but, have you seen a stunned fish near death? he shakes at the same rate(higher than just wounded) until he almost dies. then there's a few random twitches and he's dead.

aquiles and i have watched the behavior of predatory fish reacting on this wounded/death period of a smaller fish. several times we've noticed that the predators use the struggling fish vibrations to track it down. if the fish is not out in the open, like in a reef, the preds just keep circling. they keep circling till that lil fish starts its "death shake". we've seen schools of huge yellow jack and nurse sharks go nutz after a fish in this state. it was like someone set off a dinner bell. everything was sticking its head in the rocks to get at this fish.

later,
andrsn

Griff · Sep 17, 2002

andrson
thanks for the info. i'll try out the constant "death shake" idea, and use a variable resistor to get the right frequency. i guess it'll have to be trail and error, and i'm definately waiting for 10m+ viz to try it out.

mark

andrsn · Sep 17, 2002

griff, yeah, definitely the trial and few errors bit. if any sort of vibration brings them in, definitely go for subtlety. i'm thinking of using it more as a tool to turn something around when i see it; it sees me and gives me the finger :naughty maybe a couple of short pulses would be enough to turn its thoughts towards its stomach.

good luck and keep me posted if you're doin research.

cheers,
andrsn

Murat · Sep 27, 2002

Originally posted by Iyadiver
When the fish attractor is ready, I can test for you . If in my barren area it can attract fishes............wheewww.......in ur area I think even the "mermaid" want that kind of vibrator

Muhahah no way IYA. I can test it here better.

BTW ý have been away for a while coz my P2 CPU had broken:waterwork......

Looked for a new cpu unfortunatelly didn't find anything.I borrow my mate's loosy Pentium 100.What a dumb machine is that ! ! !

Amphibious · Oct 3, 2002

I see y'all talking about Hz and attracting fish. My old Spearfishing partner did a project on Large Mouth Bass and low freq. vibrations. won some big contest for it. I could did him up if anyone's interested. think he's working for ford now....

Willer

Amphibious · Oct 3, 2002

on a side note - has anyone tried throwing stones? some of our largest fish were taken by tossing a few stones/shells a few feet in front of us and watching them fall. the fish would run up to check it out, "chink!" dinner......

Willer

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