fergie_mac66
Active member
Hmm have seen some toughened glass chopping boards about 14 * 8
speccing glass for panel in bottom of hull
- Thread starter dylanwinter
- Start date
misterg
Active member
The right stuff to use would be toughened glass, but for what you want to do (assumed shallow draft & a walk home acceptable), you could get away with plain old glass. Fish tank guidelines would be as good as anything for figuring out what would be OK:
Table
(detailed calcs here )
If you decide to go with the laminated glass then beef up the thickness a bit, because it isn't as strong as plain glass (tougher: yes, but stronger: no - solid glass is ~4x stronger than the same thickness of laminated glass).
Presumably you will need a shade over the camera to prevent reflections, so why not build the window into the bottom of a watertight 'centre board case' sort of thing - even if the window breaks, the boat doesn't flood.
Andy
Table
(detailed calcs here )
If you decide to go with the laminated glass then beef up the thickness a bit, because it isn't as strong as plain glass (tougher: yes, but stronger: no - solid glass is ~4x stronger than the same thickness of laminated glass).
Presumably you will need a shade over the camera to prevent reflections, so why not build the window into the bottom of a watertight 'centre board case' sort of thing - even if the window breaks, the boat doesn't flood.
Andy
dylanwinter
Active member
all confused again
wells water is pretty clear
so visibilty should be great
http://www.keepturningleft.co.uk/kt...ktl-239-film-three-groundings-and-an-apology/
now - scratched or shatter
not sure what to do
6,mm the same as the ply would be good
Dylan
wells water is pretty clear
so visibilty should be great
http://www.keepturningleft.co.uk/kt...ktl-239-film-three-groundings-and-an-apology/
now - scratched or shatter
not sure what to do
6,mm the same as the ply would be good
Dylan
Rigger Mortice
N/A
Greenheart
Well-known member
Double-glaze it!
How about fitting a top-quality, 'permanent' piece of toughened glass, recessed into the hull 8mm, allowing a sacrificial piece of less special glass to be screwed in beneath it? If the outer is cracked, it needn't be costly to replace...and there'd be no chance of the boat being swamped.
How about fitting a top-quality, 'permanent' piece of toughened glass, recessed into the hull 8mm, allowing a sacrificial piece of less special glass to be screwed in beneath it? If the outer is cracked, it needn't be costly to replace...and there'd be no chance of the boat being swamped.
Rigger Mortice
N/A
Good idea. If there's space he could even build it up a bit higher and do away with the need for any glass at all.
Mind, Dylan would probably step into it and fall through the bottom of his punt!
dylanwinter
Active member
silly punt still confused
nope still confused chaps
D
Good idea. If there's space he could even build it up a bit higher and do away with the need for any glass at all.
Mind, Dylan would probably step into it and fall through the bottom of his punt!
nope still confused chaps
D
fergie_mac66
Active member
How about fitting a top-quality, 'permanent' piece of toughened glass, recessed into the hull 8mm, allowing a sacrificial piece of less special glass to be screwed in beneath it? If the outer is cracked, it needn't be costly to replace...and there'd be no chance of the boat being swamped.
That would be the eco way keep the heat in or out.
May want an anti mist/condensation surface Or a heater to defrost in the icy weather!
Greenheart
Well-known member
Or, he could make it much bigger, and do away with the need for the punt!
A sort of...glass-bottomed tea-chest. Climb in and paddle away. Make a will, first.
Conachair
Guest
Polycarbinate worked for me.
Rigger Mortice
N/A
I'm not sure if you are joshing us there Dylan.
But if you are not, MisterG was suggesting a kind of centre board box...instead of being just an inch or so wide, it would be, say, 8" wide. A bit like an outboard well.
Greenheart
Well-known member
Surely the glassless 'centreboard-type' box was a joke...because without the glass, no image will be flat enough to photograph?
A square hole in the bottom of the boat won't make for slick performance, either!
A square hole in the bottom of the boat won't make for slick performance, either!
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Rigger Mortice
N/A
It wasn't intended as a joke but you may well have a point
. I was thinking of those kids toys which are used for looking underwater but I think it would need a black-out cloth like the old fashioned photographers. At least it would be cheap?
Norman_E
Well-known member
Polycarbinate worked for me.
Conachair is right, don't even think about glass, use a sheet of clear polycarbonate. You could use acrylic (perspex) but polycarbonate is much tougher.
Rigger Mortice
N/A
No good for what Dylan is after. He's already said
Presumably he wants to film through it. Plastic, in the bottom of a small boat will get scratched in no time at all. Other than that, it would be fine.
exfinnsailor
New member
Do what the professionals do. Put the camera on the end of a pole and then put it over the side . What are you going to film underwater anyway. Its not the clearest of mediums or are you thinking of relocating to the Med
. What are you going to film underwater anyway. Its not the clearest of mediums or are you thinking of relocating to the Med 
clyst
Well-known member
Whatever "glass" you decide on you will need "tube" around it or you will see nothing . I was involved in the build of a glass bottom tripping boat back on the early 90s
The "tube" will be higher than the waterline so will make your boat unsinkable should it break .
The "tube" will be higher than the waterline so will make your boat unsinkable should it break .
dylanwinter
Active member
wells very clear
the water in wells is crystal clear at times
as the flood comes back it is wonderful
bit siltier on th ebb
as for a camera over the side
never know what you are filming
being able to see the bottom will add to the pleasure
now thinking about bandit glass
the local glazier should be able to cut me a bit to size
octagonal hole maybe
ps - back with laminated now
http://www.glassandglazingmiltonkeynes.co.uk/sp/Laminated_Safety_Glass.htm
http://www.glassandglazingmiltonkeynes.co.uk/sp/Toughened_Safety_Glass.htm
I think I prefer the way it fails
Do what the professionals do. Put the camera on the end of a pole and then put it over the side
the water in wells is crystal clear at times
as the flood comes back it is wonderful
bit siltier on th ebb
as for a camera over the side
never know what you are filming
being able to see the bottom will add to the pleasure
now thinking about bandit glass
the local glazier should be able to cut me a bit to size
octagonal hole maybe
ps - back with laminated now
http://www.glassandglazingmiltonkeynes.co.uk/sp/Laminated_Safety_Glass.htm
http://www.glassandglazingmiltonkeynes.co.uk/sp/Toughened_Safety_Glass.htm
I think I prefer the way it fails
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Greenheart
Well-known member
Clyst - "Tube"? What tube?
I'm guessing you mean something to exclude the much stronger unshaded daylight in the boat?
I still like my idea of seabed-facing LEDs that won't blind the viewer on deck. Mesmerising to sit around, with a drink after sunset...
I'm guessing you mean something to exclude the much stronger unshaded daylight in the boat?
I still like my idea of seabed-facing LEDs that won't blind the viewer on deck. Mesmerising to sit around, with a drink after sunset...
Applescruffs
Member
What-a-bout the old trick of the 'bottomless' bucket over the side of the punt? ....you could angle it anywhere you wanted without compromising the integrity of the hull.......but isn't the Xacti waterproof anyway??.....put it on a stick and dunk it !! or am I missing the point ;¬)