We have finished doing the flight log update for the last launch day at Doonside. The primary goal for us was to test the Mk2 staging mechanism with a bigger booster and sustainer.
Details of the new booster and sustainer are also included in the update.
We have also been working on a technique to expel extra foam from the rocket in flight and came across a way to make a simple variable diameter nozzle. The details of the concept and a video of how it works is included in the above update.
There is lots of testing that needs to be done on the nozzle, and different materials to try so it looks like we might need to set up our old test stand again.