Feb 042018
 

John D. Clark’s “Ignition!” is  basically *the* book to read if you want a readable history of modern rocket propellants. The problem has been that it has been *long* out of print and the only ways you could read it were:

  1. Interlibrary loan of a tattered copy
  2. Online purchase of a *minimum* of a $200 copy
  3. Crappy free downloadable PDF.

Fortunately, Rutgers University is going to re-release printed (and electronic) versions in May. And it’s available on Amazon for pre-order, which is awesome because if you buy it through a link in this blog post, I’ll get a small fraction of a pittance and thus “Ignition!” will help feed some cats. It’ll be available in paperback, hardback and Kindle. I’m’a get me the paperback.

 

 Posted by at 8:37 pm
Jan 312018
 

A fanciful late 1950’s Martin Company illustration of a space station. This rendering features a large parabolic solar reflector to concentrate sunlight onto a boiler to run a turbogenerator for electricity, a hockey-puck shaped habitation section (you might think it was meant to rotate, but there are windows in the floor *and* a group of astronauts seemingly standing on the side of the thing, somehow not getting flung off), some standard 1950’s gee-whiz rocketships and something at far right that I can only describe as “a thing.” Maybe it’s meant to represent the radiator for the solar generators working fluid, but if so, it seems a terrible design. Maybe it’s the death ray.

 Posted by at 5:04 am
Jan 232018
 

Currently winging their way from Ukraine to yours truly are two vintage brochures on the Antonov 225. These were picked up on ebay, purchases made possible by patrons of the APR Patreon. These brochures will in due course end up on the APR Patreon catalog, to be voted for as possible monthly rewards for the patrons.

If you’re interested in helping to preserve this sort of aerospace artifact, and also interested in getting high-rez scans of them, consider signing on to the APR Patreon.

 

 Posted by at 6:40 pm
Jan 152018
 

A 1966 Aerojet concept for a space probe with a nuclear reactor and ion engines. Note the largish thermal radiator “wings;” such things are usually left off spacecraft in science fiction, but they are a vital part of any nuclear spacecraft. Nukes, after all, are simply heat sources; in order to get useful electrical power out of them, the heat must be used to boil a working fluid which runs a turbogenerator; and the hot gas then needs to be condensed back to a liquid by radiating the heat way to space. And thermal radiation is a terribly slow and weak process, necessitating large radiators. Electricity can also be created with thermionic systems, which generate electricity across a thermal differential… hot on one side, cold on the other. But unless the cold side it attached to some radiators, the cold side will soon be just as hot as the hot side, and then… no thermal differential, no power generation.

Note also that even with a substantial powerplant and the sizable bank of ion engines, acceleration is going to be creakingly slow. Thus you can get away with spindly structures. The reactor itself is the tiny little tin can-looking thing, top and centerline; the U-shaped structure around it is a radiation shield protecting the electronics, structure and radiators from the radiation spat out by the reactor.

 Posted by at 1:39 am
Jan 022018
 

This piece of art depicts the McDonnell-Douglas “Drawbridge” orbiter in orbit delivering a satellite. Note that the wing are deployed, even though they would be folded up during entry. The geometry of the craft was such that in order to get the cargo bay door open and payloads safely in and out, the wing needed to fold down out of the way.

This points out one of the reasons why you don’t often see a whole lot of “cool” stuff in aerospace… everything has tradeoffs. And needing the wings to constantly go up and down is a bit of a headache. When it comes to spacecraft, mass is a primary priority; the mechanisms needed to deploy the wings weight a lot… never mind the mechanisms needed to retract the wing again. As an example, the real space shuttle orbiter had no landing gear retraction system. And why should it? The landing gear is hardly something the Orbiter would ever need to retract. That could be done by the ground crew without adding weight and complexity to the craft itself.

Note that the Orbiter and the payload here seem to have not NASA markings, but Red Cross markings. I suspect that a number of variants of this piece of art would have been produced with several different markings (NASA and Pan Am being the obvious ones), but why exactly Red Cross? Dunno.

Also note that this might not be an actual “Drawbridge” design, as no extension mechanism for the wing s in evidence. This might be an oversight on the part of the artist; it might be that this was a fixed-wing design. Given the RCS thrusters on the wingtips, this is most likely *not* a Drawbridge.

I’ve uploaded the high-rez version of this artwork (11.2 megabyte 6271×4763 pixel JPG) to the APR Extras Dropbox folder for 2018-01, available to all APR Patrons at the $4 level and above. If you are interested in accessing this and other aerospace historical goodies, consider signing up for the APR Patreon.

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 Posted by at 2:59 pm
Dec 312017
 

While poking around one of my old computers I found the partially finished 3D CAD model of the Martin “Aldebaran” I made some years ago for my NPP book. I’ll use the model to create diagrams for the book, in hopes that someday I’ll finish the damn thing, but I’m curious if there might be interest in physical models of the thing. Let me know. I might take a stab at this with Shapeways or some such.

 Posted by at 1:13 pm