Ramjet Engine

A. General
The ram pressure obtained during supersonic flight becomes compressed air that can be fully used by the jet engine.
There are two ways to burn this supersonic compressed air.
　(A) An engine that decelerates compressed air to subsonic speed and burns it with "jet fuel" ... Ramjet
　(B) An engine that burns compressed air with "hydrogen" while maintaining supersonic speed ... Scramjet
The efficient flight speed differs depending on the difference in the combustion method.
　(A) Ramjet ・ ・ ・ Mach 3～5
　(B) Scramjet ・ ・ ・ Mach 5～15
Neither can take off on their own and requires an external propulsion device such as a rocket engine.
Further, since it does not have a rotating device, there are some rectangular cross section engines.
　(A) Ramjet currently has practical examples in missiles.
　(B) Scramjet is still in the research and development stage because there are many difficult problems to solve such as combustion technology in hypersonic flow and heat resistant materials.
The new engine may be developed in combination with the turbojet engine for the futuristic supersonic airliner currently being researched and developed. (Turbo-Ramjet Engine)

　CHAPTER Ⅰ Ramjet Engine (RJE-01) model

　CHAPTER Ⅱ Scramjet Engine (RJE-02) model

B. Assembly Manual (PDF format, total 8 pages)
　The detail assembly manual including "Parts-List", "After printing treatment" and "Assembly procedure" are prepared based on "Standard Skill (Filing, Drilling, Tapping and painting)".

C. Purchase Parts Information;
　- Screws
M1.4x3.5L required. Quantity can be adjusted by your experience.

D. STL file
　　Total STL files are 13+9=22 items including the stand and tools.
　　“ws” of last 2 digits of file name means “With Support” special designed.

E. Total Net Print Time: Approx. 39+21=60 HR
　- (Estimated as case of PLA, 0.4mm Nozzle, 0.2mm Layer Height, 40% infill and No raft and support)
　　Note: When at actual print, each parameter may be adjusted by your experience.

F. Printing settings
　　Raft, Support, Layer Height, Infill: Depending on your experience.
　　My models were printed by "idbox" using with 0.4 nozzle, 1.75 PLA.

I do hope your success!!