Jump to content


Photo
- - - - -

Kraken smart housing bouyancy negative


  • Please log in to reply
14 replies to this topic

#1 aviator8

aviator8

    Sea Nettle

  • Member
  • Pip
  • 14 posts

Posted 13 March 2019 - 03:53 PM

Hello,

New here and have never tried to work out rig buoyancy as I always just had a small point and shoot housing and ambient light.  I got a kraken smarthousing which I thought would be fun to shoot with.  When i tested it is is very front heavy with my macro wetlense on and very negatively buoyant.  I bought a tray and arms to put it on so I can get a video light going.  When i searched to buoyancy on it I keep coming up with the buoyancy float arms which are pushing me past what I want to spend right now.  Does anyone have any DIY buoyancy advise I can use?



#2 ChrisRoss

ChrisRoss

    Manta Ray

  • Member
  • PipPipPip
  • 429 posts
  • Gender:Male
  • Location:Sydney Australia

Posted 13 March 2019 - 03:58 PM

Weigh your housing in water first and work how much buoyancy you need, you can get foam based arm but they do compress at depth a little,   Just use a luggage scale and hang it from a cord in a tub making sure its fully submerged.  Once you have the weight you can work out options for buoyancy.  Given the small size of the housing you may only need one arm.


Edited by ChrisRoss, 13 March 2019 - 05:23 PM.


#3 wydeangle

wydeangle

    Sting Ray

  • Member
  • PipPipPip
  • 220 posts

Posted 14 March 2019 - 11:00 AM

One of the do-it-yourself things I've had some good luck with is Divinycell: https://www.aircraft...inycellfoam.php

 

It's easy to cut and shape with simple wood tools, doesn't compress at recreational diving depths, and a sheet of it 26" x 15" x 3/4" is only $18US.

 

It is 3 lbs/cuft compared with water at 62 lbs/cuft means you don't need much to add buoyancy.  It takes around 29 cuin to add a pound of buoyancy, and the above sheet has 26x15x0.75 = 292.5 cuin or enough for a total of 10 lbs of buoyancy (if my arithmetic is OK :B):).

 

Tom



#4 TimG

TimG

    Sperm Whale

  • Moderator
  • 2319 posts
  • Gender:Male
  • Location:Amsterdam
  • Interests:Sunlight reefs, warm seas, good food and fine wine. And Manchester City Football Club.

Posted 14 March 2019 - 11:26 AM

Have a look at Stix floats which push on to conventional, ULCS-type arms. Not as cheap as DIY but not a ridiculous price and slightly more "elegant" than Divinycell.

 

https://fotografit.e...for-arms-jumbo/


Tim
(PADI IDC Staff Instructor and former Dive Manager, KBR Lembeh Straits)
Nikon D500, Nikkors 105mm and 8-15mm, Tokina 10-17mm,  Subal housing

http://www.timsimages.uk
Latest images: http://www.shutterst...lery_id=1940957


#5 Architeuthis

Architeuthis

    Wolf Eel

  • Member
  • PipPip
  • 179 posts
  • Gender:Male
  • Location:Austria
  • Interests:Diving / Photograpy / Video / Gardening / Cooking / Handcraft

Posted 15 March 2019 - 12:22 AM

I use floats that are used by professional fishermen to balance their nets to compensate buyoancy of my rig. I widen the opening to 25mm with drilling machine and then they fit without any problems over the 1" arms. Cheap, very stable and do not suck in water, even when cut - at least as good as the Stix floats I would say (but you need to tinker a little around). I use the types below, but there are more models available, some rated even for several hundreds of meters (company in Germany, but I assume every nation at the sea has manufacturers of net floats):

 

https://engelnetze.c...mm-14mm-bohrung

https://engelnetze.c...mm-14mm-bohrung

 

38cd39fd62bb429fb698bf93c592036f.jpg

 

Wolfgang


Edited by Architeuthis, 15 March 2019 - 12:26 AM.


#6 aviator8

aviator8

    Sea Nettle

  • Member
  • Pip
  • 14 posts

Posted 15 March 2019 - 08:24 AM

I use floats that are used by professional fishermen to balance their nets to compensate buyoancy of my rig. I widen the opening to 25mm with drilling machine and then they fit without any problems over the 1" arms. Cheap, very stable and do not suck in water, even when cut - at least as good as the Stix floats I would say (but you need to tinker a little around). I use the types below, but there are more models available, some rated even for several hundreds of meters (company in Germany, but I assume every nation at the sea has manufacturers of net floats):

 

https://engelnetze.c...mm-14mm-bohrung

https://engelnetze.c...mm-14mm-bohrung

 

attachicon.gif38cd39fd62bb429fb698bf93c592036f.jpg

 

Wolfgang

nice, how do you like that kraken light?


Have a look at Stix floats which push on to conventional, ULCS-type arms. Not as cheap as DIY but not a ridiculous price and slightly more "elegant" than Divinycell.

 

https://fotografit.e...for-arms-jumbo/

saw these, but 50 Euro for a few pieces seem excessive.  Im cheap :)


One of the do-it-yourself things I've had some good luck with is Divinycell: https://www.aircraft...inycellfoam.php

 

It's easy to cut and shape with simple wood tools, doesn't compress at recreational diving depths, and a sheet of it 26" x 15" x 3/4" is only $18US.

 

It is 3 lbs/cuft compared with water at 62 lbs/cuft means you don't need much to add buoyancy.  It takes around 29 cuin to add a pound of buoyancy, and the above sheet has 26x15x0.75 = 292.5 cuin or enough for a total of 10 lbs of buoyancy (if my arithmetic is OK :B):).

 

Tom

I will check this out.  thanks


Weigh your housing in water first and work how much buoyancy you need, you can get foam based arm but they do compress at depth a little,   Just use a luggage scale and hang it from a cord in a tub making sure its fully submerged.  Once you have the weight you can work out options for buoyancy.  Given the small size of the housing you may only need one arm.

not sure my luggage scale would be precise enough for this.  I will try though once I get my tray and arms in the mail.



#7 Architeuthis

Architeuthis

    Wolf Eel

  • Member
  • PipPip
  • 179 posts
  • Gender:Male
  • Location:Austria
  • Interests:Diving / Photograpy / Video / Gardening / Cooking / Handcraft

Posted 15 March 2019 - 09:13 AM

nice, how do you like that kraken light?

 

It is a WeeFine 2300 (I think Kraken is called Weefine in Europe) and it is very good:

 

* Flash "off" function, so no interefence with photos, but good for focusing

* in addition three intensities of red - I am excited about red since red does not irritate most creatures. Also for nightdives - often I dive just with red (feels like in a dark chamber of the old days) and you do not scare away the creatures (most do'nt even notice the flash)

* regarding the white light, the lamp is already a full diving lamp with very good intensity

* At a pinch the 2300 lumen can be used even for video

 

=> Note, however, that this lights are now vailable also in the 3000 and 6000 lumen versions (I do not know how size and features are in comparison, but I think 2x 6000 lumen would already be quite good video lights).

 

Wolfgang



#8 aviator8

aviator8

    Sea Nettle

  • Member
  • Pip
  • 14 posts

Posted 15 March 2019 - 10:18 AM

 

It is a WeeFine 2300 (I think Kraken is called Weefine in Europe) and it is very good:

 

* Flash "off" function, so no interefence with photos, but good for focusing

* in addition three intensities of red - I am excited about red since red does not irritate most creatures. Also for nightdives - often I dive just with red (feels like in a dark chamber of the old days) and you do not scare away the creatures (most do'nt even notice the flash)

* regarding the white light, the lamp is already a full diving lamp with very good intensity

* At a pinch the 2300 lumen can be used even for video

 

=> Note, however, that this lights are now vailable also in the 3000 and 6000 lumen versions (I do not know how size and features are in comparison, but I think 2x 6000 lumen would already be quite good video lights).

 

Wolfgang

the weefine kraken lights do look nice.  I am wanting to do some video with a kraken housing and a samsung phone.  I thought i could get away with a coupe 1000 lumen video lights on arms but I am coming to realize I will need something close to a couple 6K lumen lights to be useful.  Kraken is a bit out of my budget for lights that strong.  I am evaluating the scubalamp lights either V6K or V4K.



#9 aviator8

aviator8

    Sea Nettle

  • Member
  • Pip
  • 14 posts

Posted 15 March 2019 - 10:23 AM

One of the do-it-yourself things I've had some good luck with is Divinycell: https://www.aircraft...inycellfoam.php

 

It's easy to cut and shape with simple wood tools, doesn't compress at recreational diving depths, and a sheet of it 26" x 15" x 3/4" is only $18US.

 

It is 3 lbs/cuft compared with water at 62 lbs/cuft means you don't need much to add buoyancy.  It takes around 29 cuin to add a pound of buoyancy, and the above sheet has 26x15x0.75 = 292.5 cuin or enough for a total of 10 lbs of buoyancy (if my arithmetic is OK :B):).

 

Tom

do you have any pictures of how you added this to your rig?



#10 ChrisRoss

ChrisRoss

    Manta Ray

  • Member
  • PipPipPip
  • 429 posts
  • Gender:Male
  • Location:Sydney Australia

Posted 15 March 2019 - 04:44 PM

You don't need to be that precise when weighimg,  I generally aim to get the rig slightly negative, you definitely don't want it to be positive, which makes control difficult.



#11 wydeangle

wydeangle

    Sting Ray

  • Member
  • PipPipPip
  • 220 posts

Posted 16 March 2019 - 04:43 AM

aviator8,

 

Here's the only one I could find quickly: post-18574-1315658108.jpg

 

I also just cut a small rectangular piece for my tripod and zip-tied it to the underside.

 

Tom



#12 aviator8

aviator8

    Sea Nettle

  • Member
  • Pip
  • 14 posts

Posted 16 March 2019 - 12:30 PM

aviator8,

 

Here's the only one I could find quickly: post-18574-1315658108.jpg

 

I also just cut a small rectangular piece for my tripod and zip-tied it to the underside.

 

Tom

Thanks



#13 Architeuthis

Architeuthis

    Wolf Eel

  • Member
  • PipPip
  • 179 posts
  • Gender:Male
  • Location:Austria
  • Interests:Diving / Photograpy / Video / Gardening / Cooking / Handcraft

Posted 17 March 2019 - 08:56 AM

Here a little follow up to the Weefine/Kraken 2300 red LED light (I am just editing photos of my last trip to the Red Sea in February). These photos are only possible when using the red LED at night - these crustacea a quickly scared away when using white - you see two bright dots (the eyes) that disappear quickly. With red light I could observe the animal as long as I want - the flash does not bother it:

 

Shrimp_1.jpg

Shrimp2_1.jpg

 

Wolfgang


Edited by Architeuthis, 17 March 2019 - 11:37 AM.


#14 Kraken de Mabini

Kraken de Mabini

    Eagle Ray

  • Member
  • PipPipPip
  • 306 posts
  • Gender:Male
  • Location:Greater Los Angeles, California
  • Interests:UW photography, travel, carpentry, biology, medicine, physics, design & build UW custom gizmos

Posted 18 March 2019 - 08:06 AM

Divinycell foam can be cut to shape with a razor or sharp knife.  Several pieces can be glued together with plumber's PVC cement.

Then it can be painted with spray paint.  Fast and easy to work with, lasts and lasts, very forgiving for travel and rough conditions.

The professional fishing floats also seem to be a bargain, and good looking.



#15 aviator8

aviator8

    Sea Nettle

  • Member
  • Pip
  • 14 posts

Posted 18 March 2019 - 08:30 AM

Divinycell foam can be cut to shape with a razor or sharp knife.  Several pieces can be glued together with plumber's PVC cement.

Then it can be painted with spray paint.  Fast and easy to work with, lasts and lasts, very forgiving for travel and rough conditions.

The professional fishing floats also seem to be a bargain, and good looking.

I went with the floats.  They should arrive this week so i'll have to play with them to see how this works.