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Author Topic: RC Submarine rescue buoy  (Read 1013 times)

Martin (Admin)

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RC Submarine rescue buoy
« on: October 06, 2025, 01:48:45 am »

Long shot......

Anyone remember an article in Model Boats or Marine modelling magazines, about RC Submarine rescue buoy ?
....probably from the 1970's or even earlier?

The idea consist of a cork, tethered to fishing line ( disguised at a hatch, or-the-like ) & held down / glued to a tablet ( Aspirin, etc. )
that slowly dissolve and releases the cork after some time, indicating where the sub went down.

( I'm having an 'discussion' with some wag on Utube,  that think he's just invented it! )
 
 
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Fred Ellis

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Re: RC Submarine rescue buoy
« Reply #1 on: October 06, 2025, 08:57:27 am »
Martin have a word with David Forrest (association of model submariners)
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tonyH

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Re: RC Submarine rescue buoy
« Reply #2 on: October 06, 2025, 11:38:18 am »
If anyone saw Antiques Roadshow yesterday, the timer used in some limpet mines was an aniseed ball %%
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TheLongBuild

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Re: RC Submarine rescue buoy
« Reply #3 on: October 06, 2025, 12:38:52 pm »
Hi Martin, yes I have read that a few times in Model Boats but not sure when !!
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Circlip

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Re: RC Submarine rescue buoy
« Reply #4 on: October 06, 2025, 02:20:54 pm »
And the Aniseed Ball mentioned in an episode of "Foyles War" this weekend.


 Regards  Ian
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dodgy geezer

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Re: RC Submarine rescue buoy
« Reply #5 on: October 06, 2025, 06:09:33 pm »
I recall reading about a sub-sea research project many years ago where the cameras on the frame were fired at semi-random periods by springs which were held up by a cord tied through a Polo mint. Apparently fhey dissolved and released the springs at an ideal rate...
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salmon

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Re: RC Submarine rescue buoy
« Reply #6 on: October 07, 2025, 07:17:39 am »
Recently, a gentleman (sorry forgot his name) posted on another site that he uses water soluble filament (used in FDM 3D printing) to be the timer and Bob Martin did a test and the filament dissolved in 3 hours for him.
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tsenecal

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Re: RC Submarine rescue buoy
« Reply #7 on: October 07, 2025, 03:59:27 pm »
We tested the PVA filament at the latest subregatta.  we tried it twice.  it took a little over 2 hours for it to dissolve in the water at our location.  It was very consistent in the time it took to dissolve, about 10 seconds apart in both tests.
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TheLongBuild

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Re: RC Submarine rescue buoy
« Reply #8 on: October 07, 2025, 04:34:25 pm »
Think this needs a full test on various products like your glue challenge Martin  :-)
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Martin (Admin)

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Re: RC Submarine rescue buoy
« Reply #9 on: October 07, 2025, 06:01:40 pm »
Quote from: salmon on October 07, 2025, 07:17:39 am
Recently, a gentleman (sorry forgot his name) posted on another site that he uses water soluble filament (used in FDM 3D printing) to be the timer and Bob Martin did a test and the filament dissolved in 3 hours for him.

Now He's a character, for a 'professional' model submarine builder, he has an awful Lot of failures!   %)
 
 
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