The design objective was a propulsion system which is both *very* cheap to manufacture and avoids the vibration of a pulse jet.
While suitable small turbines are now widely available, they are not cheap. For the unstated application the pulse jet is more suitable.
Finding the references...
"Usually a Mach number of at least 0.2 is required for any operation at all..."
from "Jet Propulsion", Hesse & Mumford, 2nd ed. p. 28
Ramjets were extensively used in early cruise missiles which were launched by rockets. The efficiency and thrust at M < 1 are horrible as shown in the attached...
FWIW I've just looked at some "related" threads suggested by the forum program. Gad!
I've been reading texts by Hesse and Mumford, Coates and some others for a couple of weeks. While jet propulsion and design is a new topic for me, I have a 5000+ volume technical library and the education to...
Does anyone know of prior work on the use of an electric fan to supply input air to a ramjet until the air speed is sufficient (~0.2 M) for normal operation?
It's obviously possible, but might not be practical. The objective being the simplicity of a pulse jet without the vibration issues.
@boneh3ad: Thanks for the spot on summary.
@FactChecker: Going to a library would cost more than buying several books :-(
@Klystron: I've downloaded a fair bit of the NACA publications already and will collect the rest in time.
My most recent text is:
"Fundamentals of Aerodynamics"
John...
"High Mach number" is < 1.0 for subsonic. This is how it was described in the half dozen or so aerodynamics books I have. I'm not an aerodynamicist, but I am a research scientist, so I "go with the flow" when I wander into something I know very little about beyond basics physics.
Every wing...
Summary:: I'm looking for recommendations of recent aerodynamics monographs which treat high Mach number subsonic (pre-transsonic) flight thoroughly.
I'm looking for recommendations of recent aerodynamics monographs which treat high Mach number subsonic (pre-transsonic) flight thoroughly. I...
I think it fair to note that Richard King dismisses Connelly as a "mere votech teacher" based on his father having met Connelly. But Connelly's book is the canonical reference and well worth the price. Richard King has lots of experience rebuilding machines and teaching classes on scraping...
My MS was in igneous petrology with the intent of going into mining, but when I graduated in 1982 all the mines in North America were closed other than coal and I *think* Sudbury. So I went into reflection seismology and had a lot of fun. I'd love to be able to work, but at present prices no...
Schuller and Rossbach don't treat the taper case. Three lobe, tilting pad, RaIeigh step and herringbone variations are the main topics. I'm really amazed that it's as hard to find the information as it has turned out to be. I've now spent close to 8 hours looking through books in my library...
Thanks! I'll start with Harnoy. What is the distinction between the two books by Ping Huang? Is it worth getting both or is there a lot of duplication?
I have no objection to duplication, but I prefer that the repetition is written by different authors. Everyone bungles an explanation from...
I wish I had confidence that the cylinder case applied to an arbitrary surface of revolution. I've got at least 10 treatments of a cylinder.
In the case of a lathe spindle, even a simple cone gets complicated because the combined axial and radial loading is in general not normal to the bearing...
Can you provide a more specific reference? You've simply suggested I do what I have already done for hours. I was rather hoping a human being could do better than a machine.
I am looking for a book which covers hydrodynamic bearings which must support both axial and radial loads. Despite having 10 ft of books on machine design, not one treats anything other than pure axial and pure radial bearing designs.
Application is a lathe spindle, so this has been studied to...