Posts Tagged ‘launch cage’


Barbed Gardena Style Fitting + Wire Cage Development

Barbed Gardena Style Fitting
The barbed Gardena style female quick connect  fitting we ordered arrived  today. This fitting has a  longer barbed connector that ensures the hose can be clamped tighter to the fitting so the hose doesnt  blow off under high pressure.  This one is made by Neta but is the same style as the Gardena ones and accepts a 9mm male nozzle. Thanks to the friendly staff at Dural Irrigation Supplies for going through the product brochures to find it and ordering it in specially :)

Barbed Tail Gardena style connector

You can see from this pic that the area available to clamp the hose to the fitting is much longer than a standard fitting.

Close up of barbed connector

We did a simple replacement of the existing fitting on the launcher and installed  this new female quick connect fitting  to the high pressure hose.

New connector attached to the launcher

Wire Cage Development
Members of the  Water Rocket Forum are currently in the process of writing a set of  rules for  speed and distance world records for water rocket cars. We are gladly taking part in this process to ensure people who participate do it in a safe and consistent manner. One of the items that will go into the rules is having a cage around the pressure bottles on the car to contain any fragments /  connectors in the case of a pressure vessel rupture and explosion.

The cage will need to ensure no piece bigger than 10mm x 10mm can get out of the cage. We have found a galvanised welded mesh product which is used for aviaries and chicken coops that has a mesh size of 6.5mm x 6.5mm. This will provide a sturdy cage which only requires 1 wrap of mesh. Typical chicken wire has a twisted hexagon  of 12.5mm mesh size which would require two wraps to meet the mesh size specifications in the rules.

Mouse and Snake Mesh - 6.5mm x 6.5mm

This closup pic shows the mesh size better – tape measure is in cm

Closeup of Mesh

We will make a couple of cages, one for the rocket car and one to do hydrostatic tests in. We will feel a bit safer doing burst tests now if the bottles are in the cage. We will just need to try to contain the noise of the explosion with a wrapping of carpet or something around the cage  :)

Once the rules are established and agreed we should be ready to  submit a record entry pretty soon there after with the current car :)

Posted by on November 5th, 2010 2 Comments