Batch rocket
Here’s a picture of the batch rocket including:
·
The two halves of the main burn chamber assembled
·
The riser cast as two halves
·
The front steel frame
This design has a P-channel on top but in this photo the steel tube is not in place because I need to
cut the riser slightly to allow the tube to enter the rocket chamber.
To get a feel of the parts of this assembly:
Here’s one half of the burn chamber cast using a refractory (HWI versaflow45 plus):
I don’t have a photo of the cast assembly but here’s a few photos of me getting the plug parts of the
mould out of the cast. This takes care. You must avoid putting a tensile load on the weaker thin parts
of the cast.
The main burn chamber part of the mould was made from a wooden base frame with a piece of
polystyrene on top, then all wrapped in plastic sheet and taped up with masking tape.
Removing the polystyrene
Removing the polystyrene
Removing the polystyrene
Removing the wooden piece that provides the hole for the gap between the main chamber and the
riser. This was also wrapped in plastic and taped up.
Removing the wooden piece that provides the hole for the P-channel to enter.
Removing the wooden piece that becomes the riser and the collar that shapes the riser cast so that
each riser piece interlocks with the piece below as stackable pieces. This half cylinder shape was
made by sequentially cutting a wooden block on a table saw at gradually decreasing angles, then
planing the edges to make the plug less angular.