High Intensity Submersible Flounder light for Yak

Here's where you get your hands dirty, so to speak. So if you like to build or customize things for the yak, this is your forum
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Hairy Little Dwarf
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Wed Oct 29, 2008 4:25 pm

Imagine drifting silently across the flats with a car spotlight illuminating those tasty flatties...

This is likely not a new design for a flounder gigging light, but I haven't seen it broken down into a how to before, so here goes:

Gather your ingredients (These are approx RRP):
Test tube 150mm Schott $1.00
12v 50w Transverse Halogen capsule bulb $13.00
Cable @ 0.98/m $3.00
IP68 electrical Polyamide cable gland 3-6.5mm x 1 $3.00
IP68 electrical Polyamide cable gland 13-18mm x 1 $6.40
Superglue / Araldite
Touch of silicone sealant
Soldering iron
Beer
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I had finished the beer by this stage ;)

The domed locking collar of the big gland will probably have to be opened up slightly to give a tight fit over the test tube - this isn't a watertight fit, so don't worry about going slightly overboard.

With the rubber washer and locking ring in place on the small gland, apply adhesive of your choice and jam it into the locking ring end of the larger gland. Once cured, carefully apply a small bead of silicone in the recess (facing you in the following pic) up to the base of the thread of the small domed locking collar. I have used 5 minute araldite for this quite successfully, by introducing the glue, then warming the assembly so the araldite thins and flows ready into the bottom of the collar.
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Next solder your cable to the halogen bulb - I use 12v 50W units. Try to avoid handling the bulb capsule with fingers as the oils and acids from your fingers at the high temps apparently have a detrimental effect...so they say. Keep the bare ends short and you won't have to worry about sleeving the contacts. Use a round cable if you can.

Feed the lead through the gland assembly with a sniff of silicone where it sits in the small cable gland, then slide the test tube over the bulb and with a touch more silicon clamp it GENTLY into the gland. Try and have the bulb sitting so it doesn't touch the sides - I use a small wad of pink batts around the cable/bulb connections (not shown in this one). Whatever you use it must be rated for mega temperatures.
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Run the cable to the car battery in the rear tankwell and plug it in (A 25A fuse wouldn't go amiss, just in case your connection in the test tube gets jiggy for some reason). Instant nuclear fishin !(very weak pun)

Points to note:
Turning it on then lowering into water will result in a pop and it all goes dark.
Pulling it out of the water before turning it off is likely to have a similar result, or you'll watch it slowly eat its way into your hull :mrgreen:
Bulbs and test tube are sensitive to being dropped - treat with kid gloves when out of the water - the fibreglass batts in the tube help cushion this, but the raw mega-candlepower of this beastie is worth it 8-)

This sits down through the scupper in the footwell, and away you go - this is a test fit before the bulb was added.
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Using this design, I frequently bag double or triple the fish when gigging with my buddies
I have used these to around 2m without any problems for squiddies, but don't see why they shouldn't go deeper if you're after giant squid :twisted: .

Any questions?

Cheers
HLD
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.................... "Flying Mango"....................
Phoenix Hornet - Specialty Assault Craft

Dad! Dad! Look at his fish! It's way bigger than anything you've EVER caught! - Nosey 7-8yo boy on opening my icebox to father strapping down his $XXX Stabicraft 759(?) - Gold. Pure Gold.

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Hermit
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Wed Oct 29, 2008 7:35 pm

Damm good idea Hairy, given me an idea for the Tauranga flatties as well!!
Connoisseur of fine beers and ales!

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Hairy Little Dwarf
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Fri Sep 18, 2009 1:23 pm

...Finally got a pic of it in action!

Pinched the battery off the ride-on mower which gave 3 Hrs easily, and was a lot easier to handle than a car battery.

This shot was in about a foot and a half of water, the useful spread of light in operation is around a 6' radius.
fitted.jpg
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.................... "Flying Mango"....................
Phoenix Hornet - Specialty Assault Craft

Dad! Dad! Look at his fish! It's way bigger than anything you've EVER caught! - Nosey 7-8yo boy on opening my icebox to father strapping down his $XXX Stabicraft 759(?) - Gold. Pure Gold.

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technical
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Fri Sep 18, 2009 1:54 pm

Nice!
What type of beer to I need?
Warning: Contents may contain traces of nuts.

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kayak chris
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Fri Sep 18, 2009 2:12 pm

Yea looks realy good.
This gives me another idea.... watch this space. ;)
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dwmonty
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Fri Sep 18, 2009 7:36 pm

Underbody lighting.....dam boyracers! :lol:

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MikeAqua
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Mon Sep 28, 2009 1:59 pm

Nice idea HLD. Was it succesful in attracting squid? Would be useful for catching baitfish off the wharf also.
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Hairy Little Dwarf
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Mon Sep 28, 2009 2:57 pm

Yep, got a good squid haul when I tried it.

Also attracts piper and other baitfish, although there are easier methods of getting bait.
Image
.................... "Flying Mango"....................
Phoenix Hornet - Specialty Assault Craft

Dad! Dad! Look at his fish! It's way bigger than anything you've EVER caught! - Nosey 7-8yo boy on opening my icebox to father strapping down his $XXX Stabicraft 759(?) - Gold. Pure Gold.

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G1
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Fri Oct 30, 2009 5:43 pm

where do you but test tubes?

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Hairy Little Dwarf
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Fri Oct 30, 2009 9:26 pm

You can always PM me your postal address and I'll send one down to you... :mrgreen:
Image
.................... "Flying Mango"....................
Phoenix Hornet - Specialty Assault Craft

Dad! Dad! Look at his fish! It's way bigger than anything you've EVER caught! - Nosey 7-8yo boy on opening my icebox to father strapping down his $XXX Stabicraft 759(?) - Gold. Pure Gold.


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G1
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Fri Oct 30, 2009 9:33 pm

I just pinched a masterfoods seasoning jar off the rack...i will try that and see if that works....Its a little bit of a rush job,WKTOYAKKR and I are going floundering tommorow night and I have no gear....But I have a shed full of tools and a whole lot of ideas...It might end up a bit rough but hopefully it will work :)

41south
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Fri Oct 30, 2009 10:11 pm

Try here http://www.labwarehouse.co.nz/index.php?cPath=19_22 I haven't dealt with them but they look to have the goods :)
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41south
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Sat Oct 31, 2009 7:11 am

HLD - did you use the rimless variety - 13 x 150mm ?
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Here kingie kingie kingie ..........

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Hairy Little Dwarf
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Sat Oct 31, 2009 1:09 pm

Yep, rimless heavy duty, although you could probably use a rimmed tube if you inserted it from the other end and fed it through until the rim contacted the holder.

Could try the local high school science dept. Will probably let you have one for a gold coin donation.
Image
.................... "Flying Mango"....................
Phoenix Hornet - Specialty Assault Craft

Dad! Dad! Look at his fish! It's way bigger than anything you've EVER caught! - Nosey 7-8yo boy on opening my icebox to father strapping down his $XXX Stabicraft 759(?) - Gold. Pure Gold.

41south
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Wed Nov 04, 2009 9:02 pm

Have started getting all the bits together. My first mistake was ordering 13mm test tubes, I should have got the 15mm ones, the bulbs I bought from Jaycar are just that fraction too big for them. :oops: The new ones are on the way from the above link now. I got the glands from Jaycar too, they will take the 15mm tubes just fine.
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Here kingie kingie kingie ..........

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Hairy Little Dwarf
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Wed Nov 04, 2009 9:11 pm

Oh sorry 41South, my bad. :oops:

I only replied regarding the rim question, and leaving the diameter question unanswered implied it was correct.
Image
.................... "Flying Mango"....................
Phoenix Hornet - Specialty Assault Craft

Dad! Dad! Look at his fish! It's way bigger than anything you've EVER caught! - Nosey 7-8yo boy on opening my icebox to father strapping down his $XXX Stabicraft 759(?) - Gold. Pure Gold.

41south
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Wed Nov 04, 2009 9:23 pm

;) Not your fault at all HLD! I bought things in the wrong order, should have got the bulbs first - then the tubes :roll: definately my fault. I have another job for the 13mm ones, nothing goes to waste :)
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Here kingie kingie kingie ..........

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MikeAqua
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Sun Nov 08, 2009 4:15 pm

:?: Just thinking out loud here, but would this design work with a LED festoon instead of a conventional bulb, or would that not be enough light?

A LED festoon bulb would have a longer battery life, and wouldn't produce as much heat.
"No good story begins with a salad"
ZMT-7387
Viking Profish 400Stolen!! Yellow/Black
'Zespri' Viking Espri
Viking 2+1 Stolen!! Orange/yellow with scratch along one side

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Hairy Little Dwarf
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Sun Nov 08, 2009 4:37 pm

Immediate 'problems' that spring to mind would be size, the fact that LEDs are generally very directional, and without a focussing element aren't that bright.

Although if you only worked out of one side of the yak, I suppose you could give it a lash...
Image
.................... "Flying Mango"....................
Phoenix Hornet - Specialty Assault Craft

Dad! Dad! Look at his fish! It's way bigger than anything you've EVER caught! - Nosey 7-8yo boy on opening my icebox to father strapping down his $XXX Stabicraft 759(?) - Gold. Pure Gold.

slmutlow
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Fri Apr 30, 2010 7:20 pm

where would i purchase one of these test tubes m8?

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