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Overview

This nozzle was turned to accommodate the OW-152-4G #1 hotfire. 

Design and Manufacture

Charlie G turned this nozzle from 5.0 in stock in the AeroAstro machine shop. Due to his crappy caliper skills, the throat was turned to 1.4 in diameter.

PDF
name6in-1255_333 nozzle_rev3.PDF

Post Fire Review

The nozzle cracked badly. Pictures below.

Attempting to remove the nozzle insert from the phenolic liner caused a structural failure around the axial plane of the graphite. Thermal damage is visible as discoloration through the graphite. The o-ring at this location is in particularly bad shape. The phenolic had clearly ablated on the interior of the liner.

The nozzle was then deliberately pulled apart along a large radial crack.

 

The remains of this nozzle were discarded 1-25-2018.