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 in due to availability of tools.

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