Use valves and tanks from hybrid engine. This saves about $4000 in feed system components. Buying new components, such as 1/8" pressure regulators to ensure flow velocities would allow for correct pressure drops, would be more realistic in industry; however, cost is the top requirement if the engine is to be tested.
Get rid of cooling shell to make manufacturing easier.
- Cooling shell can be kept if connecting flange at bottom of combustion chamber is made a separate piece.
Throat diameter will increase from 0.329 in to 0.4375 due to availability of tools.