We have finished making our FTC rocket and we have made a new launcher for 22mm nozzles. The FTC rocket is a little different to most tube rockets because it has a 1litre bottle added to the top for extra capacity. This bottle also helps the rocket to backglide/backslide (descends backwards) so the rocket won't need a parachute! It will only carry an altimeter because the camera is too heavy and we want to reduce as much weight as possible.
We had a problem with one of our spliced pairs, It exploded!!! The reason why it exploded is because when we sanded the bottles for the glue to be strong, it also decreased the thickness of the bottles and makes them a lot weaker. We will have to make some more when we have collected enough bottles and next time we won't make the wall thickness too thin!!!