Part machined by Justin S. and completed on November 16th, 2019. This part is a segment of the Hermes 3 Nozzle Assembly.
CAD Design and Drawing
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Manufacturing Procedures
Most of the operations regarding this part will be turned on a lathe. It is recommended that a four-jaw chuck is used due to the size of the starting stock. Use a dial indicator to center the part on the new chuck. Start by turning a piece of stock aluminum 6061 into a cylinder matching the outermost dimensions of the boat-tail (6.3 in. diameter, 2.4 in. length). Then use the center drill to clear a hole in the center of the stock to begin the boring process.
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The outer chamfer on the boat-tail was arbitrarily chosen to be 7 degrees. if this angle is increased, more material can be removed and the part can be made lighter. this would shift the center of mass of the rocket up slightly and make the rocket more stable since this is the aft-most part. Increasing the chamfer angle to 15 degrees will also reduce base drag on the part.