Testing Procedures

If the engine was completed then thorough testing would have taken place. Because the engine is designed to run on a range of temperature differences with adjustments in stroke and phase angle possible it would have been a laborious and exhaustive process to test every conceivable combination of temperature difference, stroke and phase. To adjust each parameter it would be necessary to de-pressurise the engine, dismantle it, make the necessary adjustments, put it back together and pressurise it again ready for testing. The following tests are proposed as a compromise between thorough testing and time spent.

1) Test engine at maximum temperature difference (90°C hot water, ambient cooling water)

A) Test with phase angle at 90° and at maximum stroke length, then at a reduced stroke

And see which produces greatest output.

B) Using the best result from (1.a) test with phase angle at 70° and 110° and observe

Which angle (including the originally used 90°) produces the greatest output.

2) Test engine at minimum temperature difference

A) Starting with temperature difference of 20°C and using the minimum stroke length

And optimal phase angle from (1.b), continue slowly increasing temperature of heated water until engine runs under its own power. Use this temperature as the minimum, and observe power output from this configuration.

B) Test with phase angle at optimum value from (1.b) and at minimum temperature

Found in (2.a), set stroke to halfway between maximum and minimum and observe the power output, then repeat for maximum stroke.

C) Using the best result for stroke length from (2.a) and (2.b), test with phase angle at

90°, 70° and 110° and observe which angle produces the greatest output (90° will already have been determined).

This process should give clear indications as to the effects of varying phase angle and stroke length at different temperatures.

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