The Fenris engine breathes air...

For decades the focus of most research has been on ram air technology. Fenris harnesses the laws of physics to flip that around by actually suctioning air with its own combustion pressures. 


The photos on the left show the exterior and interior of a Fenris motor after testing. The two photos are not of the same surface of the motor. On the top photo, notice the small indication of heat treating is from conductive heat transfer. The small amount of carburization is a remnant of the 0.5 (s) it takes after the fuel rich ignition sequence for the motor to begin ingesting air.  The ignition sequence is used during static testing because it is a safer protocol and prevents explosions from oxidizer enrichment scenarios.


The bottom photo shows interior of the same section opposite the intake face. Heavy coking typical of a rocket motor tested with a carburizing stoichiometric ratio of oxidizer to fuel ratio is present and innocuous.

What is a Fenris Air Breathing Rocket Motor?

How was Fenris created?


Fenris is the result of iterative design utilizing highly powerful Computational Fluid Dynamics (CFD) code. Proof of concept and functions were obtained long before the first test. Fenris Mk2 proved successful during cold flow and subsequent static test firing. The pictures below show initial proof of concept functions simulated by CFD software and a static test fire, after depletion of propellant temperatures peaked at 1,286 (C) or 2,346 (F).

Why is a rocket motor breathing air such a big deal?


For a rocket motor, ingesting air means free oxidizer and free reaction mass. This means more payload can be sent to space and moved on other planets. 

Exterior of intake manifold section after 120 (s) static test fire

Interior of intake manifold section after 120 (s) static test fire




The intake, combustion and exhaust stage of a Fenris rocket engine contains ZERO moving parts. Debris up to the diameter of the intake acts as free reaction mass.  Constructed of ultra-durable super-alloys, currently Inconel, a Fenris engine is built to last, on any planet, in any fluid, liquid or gas.


Ever wonder why rockets aren't incredibly efficient and using all of the air around them for the bulk of their reaction mass? Yeah we did too.  Then we erased that unfortunate part of the past.  Rocket engines don't need to feel inefficient at family gatherings with their jet engine cousins anymore.

Maybe you didn't notice, air breathing rocket motors exist now.  Previously thought impossible, a rocket motor with both ends open.  Yes, one end suctions air with incredible force, the other end expells a mixture of super-heated air and propellant.  

Currently Fenris is patent pending.  Critical details and information will be concealed until a patent is issued.  The Fenris team will be conducting fundraising to scale Fenris to full potential in the near future. Stay tuned for more information.  With or without additional external funding, the Fenris team will continue with R&D and test activities.



FENRIS MK2 COLORIZED WALLPAPERS (left click, right click to download)