Good news. Wilson's School in conjunction with WASA is supporting the PARS Chimera Project.
We are going to be using the D-T labs to make up the re-loads for the Chimera B0 motor. We have a variety of plastics, including Polypropylene, Acetal, ABS, UHMWPE (Ultra High Molecular Weight Polyethylene) and others. The re-loads will be about 8 inches long for the 38mm hybrid.
Plastics were obtained from Direct Plastics Online.
Thursday, 19 March 2009
Tuesday, 17 March 2009
Gradually, we are starting to assemble the parts required for the B0 motor. Today, Nitrile O-Rings turned up from RS Components. They can withstand temperature to 135C. Viton would be better to 200C, but we cannot yet find a source for them in the right size.
Also from RS Components, we purchased some spare 3/16 olives for the pressure fitting.
eBay was our next port of call. We needed a Gas Jet - not easy to find. It permits the release of the Nitros (venting) just before the motor is ignited. We could not find a Gas Jet from a commercial boiler, but found they are also sold by model shops for small model engines, e.g. Mamod. The only issue may be that being a model Gas Jet, the hole is incredibly small. We could not get a .3mm drill bit into the hole. The hole might be as small as .1mm. How to find out? That's the next challenge. The hole must be large enough to permit proper venting.
Saturday, 14 March 2009
We were told a great tip from Peter Barber when we visited last weekend. To cut the De Laval nozzle shape in the graphite rod, a simple way is to create the right angle shape out of a spade drill bit. Grind this down to make up, approx say, 35 degrees. When it is spinning in a lathe, it will neatly cut a perfect nozzle shape into the graphite. Today I ordered a set of spade bits from eBay. Good price.
All about De Laval nozzles here