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Re: [PSUBS-MAILIST] Distress Buoy
Brent the effect is - if you release the bouy in the stern of sgt.peppers that you lost bouancy first. The lift of the bouy is about 3 liter (6 pound) - the stern goes first heavy. The foam is tight to 48 bars - much more than we need.
We test the system to 40 meters without problems. The trigger system and the reel was first time to flippsy - but the new device works fine. A scuba reel is not common - is to small and light.
The flashlight resistance our 60 meter test. I am not worry if it fails in greater deep. Should this be happen we will purchase a new one and fill this with a clear oil.
We use our boats in lakes - and have a motorhome onshore, with dive-time-tables - distress signal not nessesary there. On open sea we have a supply trawler - and the officer of the watch has allways to look for sub, bouys, divers, zodiacs etc..
A very light electric cable wich can be use for vhf purpose and a antenna on the bouy also would be a great idear. I don't now if soenmthing "lightcable" is available.
regards Carsten
"Brent Hartwig" <brenthartwig@hotmail.com> schrieb:
>
>
> Carsten,
>
> I had a feeling some one had used syntactic foam for distress buoys. I like the ease of using a rope like you did on Sgt. Pepper. I was thinking along the lines of using stainless steel cable for more lifting strength. Of course there are some pretty good ropes out there as well. The problem I have with using cable is it's weigh, which is going to pull hard on the buoys buoyancy, and the more cable I let out the more weight pulling on the buoy. This means if I want to have allot of cable I have the calculate the weight of the cable in fresh water and make the buoys bouyancy strong enough to deal with it. This way if I also need to release the whole role of cable, the buoy can lift it.
>
> So when you speak of a flash light on your buoy, do you mean a strobe light? If so what is the depth rating on that light? I was thinking of using the kind that are commonly attached the life jackets. I like you releasability of your buoy if your to deep. But ideally I would want the bouy to stay attached to the sub so it's easier to find, since the currents and wind can really take a buoy for a ride. Also if you have a EPIRP the moment it hits the surface and can send a signal it will give a GPS position to a satelite so they rescue party can have a starting point.
>
> Regards,
>
> Brent
>
>
>
>
>
> From: MerlinSub@t-online.de
> Reply-To: personal_submersibles@psubs.org
> To: <personal_submersibles@psubs.org>
> Subject: Re: [PSUBS-MAILIST] Distress Buoy
> Date: 04 Feb 2007 21:11 GMT
> >The distress bouy on Sgt Peppers is made from syntatic foam.
> >Has a flashlight on top and is on a 100 meter reel.
> >Rope can be pulled to 250 kg load before break.
> >
> >If the boat catch underwater something - you can put the trigger inside the boat and the bouy will be release and surface. A diver can come down to raise the boat with a lifting back.
> >
> >Its an additional feature which cost nearly nothing. Nemo has also one.
> >If you build a sub acoording to classification rules.. you have to have one.
> >
> >regards Carsten
> >
> >
> >"Brent Hartwig" <brenthartwig@hotmail.com> schrieb:
> > >
> > >
> > > 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 yo!
> > u 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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