Doug

The P60, Ram 500 could use the same pipe size that was developed for the MW54. The P70 will probably need a larger size pipe as for the KJ66 in the article. The MW54 pipe would be a bit small. The way to find out is to run it and measure the thrust and the temperature. If the thrust gain is low and the temperature goes up then it needs to be a larger size. The distance from the exhaust to the bellmouth was not that critical and is now usually set at 30mm. The divergent section only needs to be a short section and not too steeply divergent. It proved important that there was a straight section after the divergent section.

All I can say is that it works, use a digital fishing scale to measure the static thrust with a 'normal' parallel sided pipe, fit a divergent type pipe of the right size and you should be able to prove to yourself that you are gaining about 5% thrust.

I did the intial tests and then asked Tom Wilkinson to replicate them independently and publish the results.

John