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Self-bondage by candle light, various time-release designs and safety
28 Feb 2010, 02:54
Post: #11
RE: SB by candle light
I have vague idea for a candle release that should be fail-safe except for the fire hazard:

You need a metal rod with a ring where you can attach the key.
You also need a pipe of an inside diameter that will be large enough to slide the rod in and out easily at room temperature. With the exception of ice, matter expands when heated. So when you heat the rod while it is inside the pipe, it will get stuck. But it will eventually heat the pipe as well and that is the iffy part of my idea: The pipe must not expand as much as the rod. Of course, the pipe must not melt at candle heat either. Copper expands more than steal or iron when heated, so a copper rod and an iron pipe should work (and not melt).

İmage
(click to enlarge)

Now there are two big questions: At what distance will the candle be too far away to heat the rod enough? How to prevent the victim from extinguishing the candle?

A much easier way to keep a key out of reach is to heat it directly (provided it won't melt then) or keep it in a hot box. But these methods must fail because there will always be a way to either extinguish the candle or move the key or the box out of the heat of the candle.

The last idea is a bit tricky: It uses air pressure to exand some sort of balloon which then pushes against the key to hold it in place (for example in a box). Gases expand much more than metals, and so accuracy is not so important for the design of the mechanism. Though it might be difficult to find a suitable balloon.

Of course these ideas seem a bit childish or complicated at first sight, but there might be some potential. I would always prefer ice cubes (except outdoors in cold places) but sometimes there aren't ice cubes and the ideas should work with ANY candle. All these ideas have one advantage over the standard candle release: If the candle goes out, all methods will release you. The rod-pipe device might not be working properly under extreme temperature conditions.

One additional off-topic question: When you heat a metal ring, the inside diameter will get larger. What happens to the inside diameter of inflatable water wings when you inflate them (or heat the air inside)?
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02 Mar 2010, 00:01
Post: #12
RE: SB by candle light
Hi Strappado

Really great to see the thought someone puts into their sessions - your theory is ok, but I wonder if in practise it would work as you think?

There is a risk (let us ignore the fire risk - not for me, but it's a free world!) when heating something that it will not just expand, but also distort. Copper is very maluable, so can easily distort when hot - you risk being stuck for good if this happened!

Also your candle selection needs to be very careful, it can't really be 'any candle' - some burn for hours, which could heat the copper to a very high temprature (100's degrees C!!) this means your assembly will get very hot and could cause terrible problems. Too small a candle and the copper will not get hot enough to expand tight into the outer pipe.

If I am to be honest, why not try something safer - ice is the best (of course!) but low voltage electronics can be useful (there are possibilities in this: http://cgi.ebay.co.uk/ws/eBayISAPI.dll?V...K:MEWAX:IT)

Whatever you choose, please play safe

MJ
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02 Mar 2010, 23:20
Post: #13
RE: SB by candle light
My device would indeed require a lot of research before implementation. Generally, metal has good heat conducting properties and the heating will be distributed everywhere as well as passed on to the surrounding air. This and the amount of matter in relation to its surface might set a maximum temperature for heating by candle-light (I am not a physicist, so I can't provide a formula). Copper melts at around 1000 °C, which is probably long after relaxing, which could cause distortion. The melting point of iron is considerably higher but so is the heat conduction. If you ever tried to boil water over a candle, you know that it takes forever and therefore I think a rather big device should work. Furthermore, copper and iron come in different qualities. A pot that distorts at around 200°C when forgotten on the oven had a lot of tension inside the material due to the production process. Of course uneven heat distribution plays a role here too but I think a sturdy pipe with high wall thickness and a heavy rod will not pop into odd shapes when heated and cooled down again.

Anyway, I mainly had fun playing with the idea of reversing the candle method to something that releases you when the candle fails. And I like the idea that unlike the normal candle method or the ice method, release consists of two steps: Once the candle has burnt down, you have to wait until the metal has cooled down and you can't even tell when that is until the rod finally falls - unless you are a physicist using your stopwatch to verify your calculated predictions Big Grin
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31 Mar 2010, 08:16
Post: #14
RE: SB by candle light
*Runs some magic numbers...*

Hmm... Annoying... As good an idea as Strappado's is, it's difficult to implement.
Doing some research to linear expansion of solid materials (I'm going to save you the details), copper and steel have different coefficients, but to give you an idea, heating copper pipe with adiameter of 9 mm to 100C, gives it an expansion of 0.015mm.... That's not a lot.. And then the Steel that also expands... (Granted, not as much but still..)
You'd need two pipes that barely fit into eachother to begin with.
Don't worry about melting the copper though, its melting point lies around 1084C...
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20 Jul 2010, 19:08
Post: #15
RE: SB by candle light
Although I really do not like the idea of fire involved in a release method, the SB by candlelight has an interesting appeal to me. As such I have been giving some thought to how a candle release could be done with a reasonable margin of safety.

My main issues with a candle release is what if the candle goes out? and second the candle starting an unintended fire.

Essentially there are two properties that can be worked with, light and heat. My initial thoughts on this is to combine the candle with an electromagnet release. By using either a phototransister for light, or a thermister for heat it might be possible to create a circuit for controlling the electromagnet that when no more light or heat are detected the electo magnet would be turned off and allow the keys to drop.

This idea seems fairly fail-safe. If the candle goes out, then the light or heat will go away and the circuit will disable the electromagnet, and if the controlling circuit loses power the electro magnet would also be turned off. In either case the keys will be dropped.

Since there is no stress on the candle at all, it should be possible to place it in a location or setting that would make the chance for an accidental fire minimal.

Just a thought, I do not know how feasible this idea actually is. But it does seem better to me than burning strings and hot metal rods. eheh
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20 Jul 2010, 19:38
Post: #16
RE: SB by candle light
Using an electronic circuit to check the state of the candle one more time proves the whole method as utterly unreliable, dangerous and useless.

Case closed ;-)
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20 Jul 2010, 19:50
Post: #17
RE: SB by candle light
The circuit itself would require to be on for the electromagnet to be on. So if the circuit lost power then so would the electromagnet. Basic idea is that the circuit would turn a relay on when it detected the heat/light and therefore provide power to the electromagnet. If the heat or light went away the triggering voltage would no longer exist and the relay would go back to its rest state, cutting power to the electromagnet and turning it off. If the controlling circuit lost power, same result, the relay would return to its rest state and the electromagnet loses its power. Power to the electromagnet fail and keys are dropped anyways. so in all cases all points of failure result in the electromagnet losing power and dropping the keys.

This was mostly just a thought exercise, and certainly seemed a better idea than relying on the heating coefficients of different metals.

Personally, I do not like the idea of fire involved in a release anyways, so again, just a thought experiment on the idea of a candle release, I personally would not try it.
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24 Jul 2010, 09:00
Post: #18
RE: SB by candle light
Still (just my 2 cents as an electronics / SB fan) I have to agree with Like Ra,

In my opinion, we're starting to go about this the wrong way. I think that selfbondage has both many aspects of satisfaction and fun, as it has facets of logistics planning and safety.
Where you should aim to have your selfbondage experience as much fun as possible (live your fantasy) your release mechanism should be both straightforward and safe to use. (Personally I'd be pretty annoyed if I'd be bound helplessly and a candle topples over onto a pile of notes after a wire that got burned in half sweeps against it.

Even the release mechanisms that have you crawl, reach, fondle, drink, curse or otherwise add to the experience should have a backup.


I'm not saying it's impossible for example to use a light sensor, but think of the following situation:
You place a light sensor in front of your window to have a night of bondage and be released by the sun. (How poetic.. And I might consider it. ^_^ ) But it rains that day.. Oops? Or, if you made your sensor more sensitive, a truck parks in front of your window and blocks the sun. (do'h) Or, extreeeeemely annoying: A full moon produces enough light to release. (Grrrrr... )

If anything, when you're using an electronic circuit that has a default action to open (for example during a power outage) Place at least one backup I thought of: A wallclock timer. You can get these in any hardwareshop. It's the same ones you use to periodically switch lights on and off.
You set the timer for several hours after the main release mechanism is supposed to release you. So if that fails, you both have the fear that your release mechanism failed, the agony (fun?) of several hours more bondage fun and get out safe. Smile

Bottom line (again, my 2 cents..) :
- Candles are always a stupid™ thing!
- If you're going to use unreliable sensor mechanisms, ALSO use something in the circuit that overrides everything in a safe way.

Bottom bottom line (I can't stress this enough I think...)
- PLAY SAFE!!!

Question by the way:
How much interest would there be for an offer / shop for (release) devices and mechanisms? (Just wondering really...)
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24 Jul 2010, 11:44
Post: #19
RE: SB by candle light
(24 Jul 2010 09:00 )Daemon Wrote:  Still (just my 2 cents as an electronics / SB fan) I have to agree with Like Ra,

In my opinion, we're starting to go about this the wrong way. I think that selfbondage has both many aspects of satisfaction and fun, as it has facets of logistics planning and safety.
Where you should aim to have your selfbondage experience as much fun as possible (live your fantasy) your release mechanism should be both straightforward and safe to use...

...
Bottom line (again, my 2 cents..) :
- Candles are always a stupid™ thing!
- If you're going to use unreliable sensor mechanisms, ALSO use something in the circuit that overrides everything in a safe way.

Bottom bottom line (I can't stress this enough I think...)
- PLAY SAFE!!!

100% agree with DaemonSmile

I would also ask the obvious (to me at least) question of why over complicate the release? If you're planning to use both a candle and electronics, why not junk the risky candle completely and play safe® with the electronics? And always, always, have a back-up fail-safe – better unsatisfied than truly stuck (and worse….)

Fantasy release mechanisms are absolutely fine – but they should stay as that in stories and not become a real life nightmare. I really enjoy reading SB stories with the most complex and, frankly, ludicrously dangerous release mechanisms (A random chance of staying bound forever in a deserted house is NOT my idea of fun! Using a cat/dog to eventually bring the release key to you? Not in my world – the daft buggers are more likely to curl up and sleep for the next 20hrs, they might eventually come when they get hungry and you are starting to smell a bit off!), but they are just erotic tales and their purpose is to stimulate my SB drive, not necessarily my SB sessions.

I’m not criticising anyone – just offering my opinion.

Isn’t it ironic that I enjoy the freedom to place myself in bondage?Big Grin

As Daemon says – Play safe

MJ
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24 Jul 2010, 13:00
Post: #20
RE: SB by candle light
Yes guys, I absolutely agree with you, but Susanr's point is a "shifted" into the "theoretical" direction:

(20 Jul 2010 19:50 )susanr Wrote:  Personally, I do not like the idea of fire involved in a release anyways, so again, just a thought experiment on the idea of a candle release, I personally would not try it.

"Thought experiment" are the keywords.

Speaking of various weird release mechanisms. As I said I stopped making any more ice-locks, despite I have more ideas. I was in a DIY shop with a handful of various details, tubes, pipes, screws, etc, when I was struck with one thought:"Hm, what for?". Why inventing a bike with square wheels, when there's already one with round ones and working most of the time?

I like thought experiments very much, I like proving them working or not (theoretically ;-), I can even draw sketches and drafts, but I won't make it or use it.

Saying that, if I have time I will probably draw and publish my ice-lock designs ;-)
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