Prototype shelter testing

The following tests were carried out on the 75cm x 19mm diameter steel shelter:

( it should be noted that the final shelter kit uses the stonger 90cm x 22mm diameter tubular steel)

table comparisons
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Roof frame weight bearing

30Kg weights were hung from individual points on the frame and displacement measured.

The frame flexed considerably (see table1 below) but returned to its original position after the load was removed.

35Kg timber cladding was applied both along and across the frame. All joints performed well under loading.

 When the central square reciprocal frame was supported in a horizontal plane it could support over 100Kg.

Lateral stress tests joints

Lateral stress testing was performed using a mechanical gauge (table 1).

With the frame securely anchored to the ground the frame flexed without failure.

The amount of lateral stress applied was only limited by the guy ropes being pulled out of the ground.

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This diagram indicates the points on the frame that were tested (see table 1).

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Stress test results

These very basic tests indicate the considerable strength of the frame.

Apart from the two ridge pole support hooks only the basic 4 metre lengths of sisal twine were used to lash the joints.

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Water run off

Water was rapidly channelled away when the frame was at its normal 30 degree incline.

Even at lower inclines water accumulation in the top sector was minimal.

Further protype testing on Dartmoor:

The above prototype shelter was field tested on Dartmoor .

This included sleeping overnight in the shelter on an exposed hillside under storm conditions.

The shelter performed very well in adverse conditions.

This video was taken at the time.

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