Fish finder sonar

[Kim Sleep]

Oh come on...I have tons of schematics for underwater listening devices and pinger transmitters that would probably cost no more than a few bucks to put together. A very narrow beam "ping" could be easily accomplished that would only require a hole in a hull a few mm wide.
Of course the resolution would not be as accurate a million dollar units... but id bet dollars to donuts that with a bit of practice, you could get within a few feet of your ship.
I found a 1mm hole , 4 feet down, in my friends pool using a microphone wrapped in a condom, on the end of a broom pole, along with a single ic chip amplifier that I whipped up using parts from my junk piles...I didnt even get wet.
If anyone would like the schematics for this, please email me, and I will happily oblige.
I used the same unit to listen to underwater fish in the Keys...could hear whales miles away, and shrimp making a cool sounding snap.

[Kim Sleep]

Looking at the supplied images from deeper .com...I think the only way uou could possibly see your ship, is if it was stuck in the bottom, standing straight up at a 45 degree angle, and even then it may be doubtful.
Small video cameras are quite inexpensive and easily waterproofed, I think that one on the end of a pole is going to give you a faar better look at the bottom than any consumer-grade sonar.
I think that going the way of a consumer-grade sonar is pretty much folley.

[He Who Shall Not Be Named]

OK. I have more water time than anyone else in this game (both driving and retrieving via snorkel, scuba, and foot-shuffle) and I'm putting this waste of band-width to bed.

Von's right -- you're going to get wet. Or, you don't get your toy back.

Don't sweat the details. Bottom will be feel-only, and even if crystal clear when you start the search, the bottom will be like looking through a glass of milk once your fins stir up the silt. How many of us operate over sand bottoms? Me neither.

Don't need fancy pingers -- you got one in the boat. It's called a propulsion motor. And servo noise comes through loud and clear too. And if you've got a pump in there activated by a fail-safe, then you have that noise source to direct you as you make your search sweeps. And if you must have a pinger, and you can't figure out how to adapt a 555 series chip to do the job, then you are in the wrong game!

Only three guys I know of in this thread who have ACTUALLY operated an r/c model submarine. And one of them (Me!) is getting tired of you guys getting so bogged down in the details that you won't find the time to finish and operate an r/c submarine. Yaackk, yaackkk, yaackkk .....

Less chatter, more work. R/c submarining is not an academic thought-game played out is some frig'n Faculty Lounge by egg-head do-nothings; no, it's an ACTIVITY; it's something YOU DO!

Any idiot can come up with problems. Not every idiot can make something, make it work, then work out a solution when the damned thing goes belly-up!

Ain't that right, Tom?

STOP JOUSTING AT WIND-MILLS!!!!!

M

[trout]

Wow, great way to drag me into your rant.....lol. Yes, building, running, and losing (the smarter ones do not necessarily do the last part) a sub is really important experience. I do think some of this is wasted bandwidth, but some is not. If your circuit fries on a sub, then what do you use to zero in on? A secondary source of sound might not be a bad idea and made small enough, a simple extra safety.
As far as diving I am not going to get into a peeing contest and fully admit others have more time. I have been diving since 1974 (actually before then, but certified in 74). Not so much for the past decade, but David is right. Clear water can get mucky pretty quickly. Sound might help guide you.

[redboat219]

What's wrong with using something to help the diver narrow down the search area?

[redboat219]

Looks like a case of Andropause. It's caused by a drop in the male hormone testosterone.

HWSNBM definitely has some of the symptoms.

-Anger and social withdrawal.
-Irritability
-Hypersensitivity
-Anxiety
-Hot Flashes
-Mood swings
-Depression
-Lack of libido
-Back and head aches
-Insomnia

[Kim Sleep]

Im not certain if this will work underwater, not certain exactly the transmitter frequencies

http://www.youtube.com/watch?v=2vRUEguKY54

[trout]

Looks like a case of Andropause. It's caused by a drop in the male hormone testosterone.

HWSNBM definitely has some of the symptoms.

-Anger and social withdrawal.
-Irritability
-Hypersensitivity
-Anxiety
-Hot Flashes
-Mood swings
-Depression
-Lack of libido
-Back and head aches
-Insomnia

No, not a case of andropause, he gets ticked off when those that have not built make suggestions on something you have not done yourself. Build your sub Rommel, then tell me what you can fit in there or use to find it.

[He Who Shall Not Be Named]

What's wrong with using something to help the diver narrow down the search area?

Just how many 'somethings' do you want to cram into that tight dry space?

[He Who Shall Not Be Named]

Looks like a case of Andropause. It's caused by a drop in the male hormone testosterone.

HWSNBM definitely has some of the symptoms.

-Anger and social withdrawal.
-Irritability
-Hypersensitivity
-Anxiety
-Hot Flashes
-Mood swings
-Depression
-Lack of libido
-Back and head aches
-Insomnia

Guilty, as charged, your Honor.

M

[redboat219]

Just how many 'somethings' do you want to cram into that tight dry space?

I didn't mention I wanted to put a fish finder or a pinger onboard. My question was "has anybody tried using one of those fish finder sonar to look for a lost boat (instead of having a diver grope around the bottom of the pond or lake for hours in potentially the wrong place)?"

[Von Hilde]

I didn't mention I wanted to put a fish finder or a pinger onboard. My question was "has anybody tried using one of those fish finder sonar to look for a lost boat (instead of having a diver grope around the bottom of the pond or lake for hours in potentially the wrong place)?"

The answer to your question would be a Negative. At least not on this forum. Aparently not many people loose their boat if they have one to begin with. One of those beepers would be nice to have had already installed. A little preventitive maintainance alwys is a good thing. I built a marker buoy on the 1/24 type II Thats been underconstruction in my shop for the last 2 years. It has a LED on the float and a 100 ft of 8lb test monofiliment on a spool.