Re: Launch tube question
Posted: Sun May 24, 2009 7:57 am
Hello from Germany,
it ist great that the discussion goes around the world
From our (German roketrys) point of view, uses a waterrocket the thrust from the water to fly.
That means the compressed air inside the rocket presses the water through the nozzle and thats the 'thrust'. But the 'world record' from USA does not really use this princip.
We don't know the measurements of your rocket and launchtube diameter, but it seems that your rockets use not that 'waterrocket-princip'.
If the outer-diameter of the launch tube and the inner diameter of the rocket are nearly the same, than you have a zylinder! And that is not a waterrocket ;)
Our launchtubes are 15mm thick and the rockets are at minimum normally around 60mm thick.
Only the nozzles have a diameter of 15mm (or 9mm or 22mm).
So there is the feeling of a rocket when it starts. (Water comes out... )
To the point of the 'complicated' rules of launchtubes:
The use of a launchtube is a good thing, as someone mentioned it, it gives stability in the first phase of the flight. So we allowed a launchtube. But to prevent such 'zylinder-rockets' the maximum diameter is limited to 15mm. Because some people use cable tie launchers and they have a short launchtube of 22mm there a this special rules.
But the rules are not fix, so there might be some changes in next time ;)
I hope some questions are solved, if not ask
Greetings
Scorpion_XIII
it ist great that the discussion goes around the world
From our (German roketrys) point of view, uses a waterrocket the thrust from the water to fly.
That means the compressed air inside the rocket presses the water through the nozzle and thats the 'thrust'. But the 'world record' from USA does not really use this princip.
We don't know the measurements of your rocket and launchtube diameter, but it seems that your rockets use not that 'waterrocket-princip'.
If the outer-diameter of the launch tube and the inner diameter of the rocket are nearly the same, than you have a zylinder! And that is not a waterrocket ;)
Our launchtubes are 15mm thick and the rockets are at minimum normally around 60mm thick.
Only the nozzles have a diameter of 15mm (or 9mm or 22mm).
So there is the feeling of a rocket when it starts. (Water comes out... )
To the point of the 'complicated' rules of launchtubes:
The use of a launchtube is a good thing, as someone mentioned it, it gives stability in the first phase of the flight. So we allowed a launchtube. But to prevent such 'zylinder-rockets' the maximum diameter is limited to 15mm. Because some people use cable tie launchers and they have a short launchtube of 22mm there a this special rules.
But the rules are not fix, so there might be some changes in next time ;)
I hope some questions are solved, if not ask
Greetings
Scorpion_XIII