HOME MADE HELIOGRAPH - COULD BE VITAL TO YOUR SURVIVAL
By Juri Keyter and Kim Pratley
A first aid kit is an essential part and a legal requirement on any aircraft but there are a few other pieces of equipment that may be crucial to your survival depending on the type of flying you do. Items such as life rafts and jackets may be important on flights over water. Food and drinking water may be a vital part of survival if you have an emergency and land miles away from civilization. We see it on TV and often hear stories about this and the first question is always:
HOME MADE HELIOGRAPH
A heliograph in the aviation context is a very simple and rather effective device for attracting the attention of a search aircraft. I recommend that you always have one on board. It is essentially just a mirror to reflect sunlight. The search aircraft crew can observe these flashes from a surprisingly far distance.
Here's what you need. An old CD, a piece of string, a tongue depressor (wide ice-cream stick), a permanent marker and a paper punch.
So why the strings and sticks; Why not just a mirror? It's all to do with aiming.
At some stage, most of us would have fooled around at school shining sunlight off our wristwatch dial into a victim's eyes on the other side of the class. The task was easy because you would tilt the watch face and track the reflection over the floor and wall until it was in the victim's eyes or sometimes even highlighting some tempting bit of the class sweetheart's body much to the delight of a disparate bunch of unsavoury characters at the back of the class; probably destined to become pilots!
The problem with an aircraft in the air is that you can't track the light reflection over the floor and wall to aim it.
The string and stick is all about aiming the mirror. It simply interposes a target between you and the aircraft to line things up.
Oh yes, if you are planning for a crash, it's also important not to have a breakable mirror.
So, why not make yourself a simple heliograph and arrange with friends or family to use it one Saturday afternoon whilst you fly past at various distances to gauge its effectiveness.
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