Øystein ,
As soon as I got this model done I was thinking about just the thing your talking about. If I only had rope attached to the buoy and had to cut the rope, then your right it could tip over and stay on it's side. I was intending this buoy to be attached with cable to the sub, and in that case the cable would weigh down the center of the buoy and keep it up right. But I may need to release this buoy, and even in that case the weight of the cable would likely keep it up right. How ever I do think I will design another one with some sort of weight down a foot or more, like your talking about, and see what you think of that model. Keep in mind these buoys are going to be attached to the top of one sub so having an easy shape on the bottom of the buoy that will fit the shape of the top of your sub will be better.
Regards,
Brent
From: "Øystein Skarholm" <skarholm@gmail.com>
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Distress Buoy
Date: Sun, 4 Feb 2007 14:40:49 +0100
>Nice buoy, but I do not think that shape is very fit for purpose. If
>there is short crested waves at the surface this buoy will tripp to
>its side. I would go for a little longer rod with a weight in one
>end,
>and the strobe and marking in the other. Then 1/3 from the bottom
>you
>mount the floater. The floater can easily be made from the same foam
>they use as buyonce for ROV¨s.
>
>
>
>
>
>
>On 2/4/07, Brent Hartwig <brenthartwig@hotmail.com> wrote:
>>
>>Has any one seen or heard of a distress buoy made out of syntactic
>>foam? I
>>would think it would be a logical choice of material. I would
>>guess that
>>the Navy uses this type of buoy but I haven't seen any data to that
>>effect.
>>I was thinking of making a rectangular shaped buoy for stability,
>>cover it
>>with fiberglass, then paint that orange or the like. With good
>>stability
>>you can then add a three or four foot fiberglass or carbon fiber
>>rod in the
>>middle with a flag and strobe light attached at the top. Perhaps a
>>VHF
>>antenna could also be mounted on this buoy. Of course a EPIRB with
>>GPS
>>could be added, but you would have to check the depth rating on the
>>EPIRB
>>first and if it can't handle the depth you plan to go then perhaps
>>a very
>>small pressure hull to protect it could be constructed. A alarm
>>noise maker
>>might be able to be put on this buoy as well.
>>If you use a strong enough cable to hold onto the buoy, then
>>perhaps if your
>>not to entangled with some thing, and you have an attachment point
>>on the
>>buoy to the cable, someone could winch you up to the surface with
>>out having
>>to dive down to the sub, which might be to deep for your local
>>divers. You
>>could tell the rescuers on the surface if your entangled or not
>>with the VHF
>>antenna. You could also tell them any thing else they may need to
>>know.
>> Just some brain storming, so please speak your mind, since I'm
>>likely
>>missing a thing of two.
>>
>>Here is a couple pictures of a basic 3D model of a distress buoy I
>>worked up
>>last night of what I'm thinking might work.
>>
>>http://www.frappr.com/?a=viewphoto&id=2384531&pid=3936744
>>
>>http://www.frappr.com/?a=viewphoto&id=2384531&pid=3936746
>>
>>Nice decal work on the Alvin Jr. submersible Joe. Now you
>>have one
>>more tool to put in your toolbox of skills.
>>Regards,
>>Brent
>>
>>
>>
>>
>> ________________________________
>>
>>From: "Joseph Perkel" <joeperkel@hotmail.com>
>>Reply-To: personal_submersibles@psubs.org
>>To: personal_submersibles@psubs.org
>>Subject: Re: [PSUBS-MAILIST] Viewport
>>Date: Sun, 04 Feb 2007 04:26:26 +0000
>> >Carsten,
>> >
>> >If I recall correctly, DSRV (or another sub) uses remote viewing
>> >(cameras) as well. I think this is a very fine choice for
>>Euronaut
>> >for the reasons you state. It should be quite a spectacular
>> >Navigation station when done.
>> >
>> >I will be using a minimum of two myself with a common 6" lCD
>>screen,
>> >one camera on the bow with a slight down angle, and one in the
>>sail
>> >facing aft for surface use as I will be dispensing with the aft
>> >viewport completely. That space will be occupied with a distress
>> >buoy.
>> >
>> >Joe
>> >
>> >>From: MerlinSub@t-online.de
>> >>Reply-To: personal_submersibles@psubs.org
>> >>To: <personal_submersibles@psubs.org>
>> >>Subject: Re: [PSUBS-MAILIST] Viewport
>> >>Date: 03 Feb 2007 09:39 GMT
>> >>
>> >>Two viewports in the bow endcap are calculate to about 12.000
>>USD
>> >>including the stainless steel frameholder without installation .
>> >>And because of the divetanks the distance to an object in front
>>is
>> >>around 4 meters = 13 feet to the viewer. Viewport are useless as
>> >>higher underwaterspeed than 1 knots or so. And the euronaut can
>>not
>> >>drive so slow that you can navigate to viewports.
>> >>Thats the reason that I decide to get with a video system.
>> >>
>> >>I go with videocameras and big monitors. Like the bridge on
>> >>Startrek Enterprice.
>> >>One videocamera is abt.100 USD and they are close to the bow. I
>> >>will have at least 6. One in the bow. 3 in the mast to generate
>> >>panoramic view. One looks to the propeller and one is in the
>>diver
>> >>compartment. We can switch the four monitors in the bridge as we
>> >>like. On a bigger Psub sonars ar more common for navigation. So
>>the
>> >>sub will get one forward looking sonar and one side scan sonar -
>> >>and one echosounder of course.
>> >>
>> >>A 180° dome with 570 mm diameter and safe for 200 m operating
>>deep
>> >>is availabel via Emile or me and will cost something around
>> >>1000-1200 euro.
>> >>Base material is 40 mm strong and minimum tickness on the
>>highest
>> >>point
>> >>is about 15 mm. Comes without classification. You can have them
>> >>with certificate also but than add just a zero to the price
>> >>figures. Other dome diameters are possible but more expensive
>> >>because we have to make another tool.
>> >>
>> >>best regrads Carsten
>> >>
>> >>"Øystein Skarholm" <skarholm@gmail.com> schrieb:
>> >> > Thank you very much Carsten, John and Andy. How come you,
>> >>Carsten,
>> >> > choose to have no viewports at all on the Euronaut?
>> >> > Are there any web sides where I can go and have a look at
>> >>viewports?
>> >> > Maybe with info about price as well. I think there is a lot
>>of
>> >> > considering to be done.
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> > On 2/2/07, MerlinSub@t-online.de <MerlinSub@t-online.de>
>>wrote:
>> >> > > Di = 27 inch or 686 mm (clear view) for 300 meter
>> >> > >
>> >> > > s/d1 = 0,21 and 10°
>> >> > > so s = Tickness = 0,21 x 686 = 144 mm or about 6 ich strong
>> >>acrylic.
>> >> > >
>> >> > > Outside Diameter of glas should be between 1,25-1,5 of Di
>> >> > > = 34 - 40 inch.
>> >> > >
>> >> > > Calculate to Germaninscher Lloyds rules.
>> >> > >
>> >> > > Dome will be better.. 0,034 x 27 = about 1 inch thickness.
>> >> > >
>> >> > > Best regards Carsten
>> >> > >
>> >> > > "Øystein Skarholm" <skarholm@gmail.com> schrieb:
>> >> > > > Does anybody know if flat view ports can go as deep as
>>250m
>> >>- 300meter.
>> >> > > > The view port size is off course critical here. I am
>> >>thinking of a
>> >> > > > view port size approximately 27 inch.
>> >> > > > Where can I find material properties for strength
>> >>calculation on acryl ?
>> >> > > >
>> >> > > > What is the best material for view ports anyway.
>> >> > > > Hope somebody knows the answer or where to find the
>>answer.
>> >> > > >
>> >> > > > Thanks
>> >> > > >
>> >> > > > --
>> >> > > > Vennlig hilsen
>> >> > > > Øystein Skarholm
>> >> > > >
>> >> > > >
>> >> > > >
>> >> > > >
>> >> > > >
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>> >> > --
>> >> > Vennlig hilsen
>> >> > Øystein Skarholm
>> >> >
>> >> >
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>
>
>--
>Vennlig hilsen
>Øystein Skarholm
>
>
>
>
>************************************************************************
>************************************************************************
>************************************************************************
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