Airgun World - - Points Of You -

Hav­ing been in­volved in avi­a­tion crash test­ing for many years, I was in­ter­ested to read Dave Barham’s ar­ti­cle on the safe trans­porta­tion of air cylin­ders. As Dave points out, the most vul­ner­a­ble is the valve and we should en­deav­our to pro­tect it, no mat­ter how we trans­port our cylin­ders.

My main in­ter­est is the pro­tec­tion of the ve­hi­cle oc­cu­pants from what be­comes an un­guided mis­sile ap­proach­ing from the be­hind in the event of a crash. It is im­pos­si­ble to cover ev­ery sit­u­a­tion, so let’s imag­ine we have a 5-litre, 20lb cylin­der, un­re­strained, in a car trav­el­ling at 30mph, which hits a solid ob­ject like a wall. Even with crum­ple zones the im­pact is likely to pro­duce a de­cel­er­a­tion of some­thing like 15g. At some point, the cylin­der now ef­fec­tively weighs 300lbs (20x15) and if not in con­tact with the seat back, will con­tinue to travel at 30mph un­til it comes into con­tact with some­thing solid, which could be the back of your head!

If, as in Dave’s last pho­to­graph the cylin­der is placed end on to the seat back, it presents a fairly small sur­face area to the seat back and could eas­ily punch it’s way

Through, but if it is placed par­al­lel to the seat back it has a larger con­tact area which, as the seat back de­forms, might be enough to re­tain it in the boot. In ei­ther case, hav­ing the cylin­der in con­tact with the seat back will re­duce the pos­si­bil­ity of it ac­cel­er­at­ing for­ward as the ve­hi­cle slows down.

I am sure there are some air­gun­ners who are in­volved with au­to­mo­tive crash test­ing and are more knowl­edge­able on the sub­ject of un­re­strained ob­jects in cars.

I only wish to point out the po­ten­tial dan­ger in which we could un­wit­tingly be plac­ing our­selves. Great mag­a­zine. TONY WOOD­WARD

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