SOV-4-9

This is actually the same rocket as in the 2 previous posts but with a 9 mm gardena nozzle. the reason I added this 9 mm nozzle is that I wanted the rocket to have a longer thrust phase and fly slower. I made the nozzle from a soap dispenser cap and a gardena quick connector, the reason that I used this cap is that it has a longer thread so there's enough space to hold the connector and a washer, and it already has a hole in it to put the nozzle through. 

It had been a cold and wet summer but there were a couple of good days at the beginning of the fall so I made some time to launch the rocket again.
After a 10 minute drive and a 5 minute walk we arrived at launch site. I assembled the launcher, prepared the rocket and another 10 minutes later we were ready for the first launch. The plan was to launch the rocket at 100 psi again but (as always) things didn't go as planned. The rocket took off spontaneous at 60 psi leaving the nozzle and his adapters on the launcher. We got the rocket back and reassembled it but the second launch it had the same problem again, we tried a third time again with the same results. Probably the stress from previous launches had made some cracks in the thread of the cap so it couldn't hold the pressure anymore. I had no tools and materials to fix this in the field so we went home a little discouraged by the failed launches. 

Well, at least there's a nice onboard video that shows the kids had fun...