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Gunship

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Gunship from Larry Niven and Jerry Pournelle's novel Footfall. See my related post Michael for additional detail.

Image featured on Winchell Chung’s Atomic Rockets site, Michael Nuclear Pulse Propulsion Battleship Scroll down at the link.

Featured on Realistic Spaceship Illustrations Blog, Link: here

“They take one of the main guns off a Navy ship. Wrap a spaceship around it. Not a lot of ship, just enough to steer it. Add an automatic loader and nuclear weapons for shells. Steer it with TV.” —from Footfall, pg. 354

In the novel these Gunships are referred to as “Stovepipe’s.” I was far less concerned with designing to match that narrative description than I was with designing the most compact spacecraft possible capable of the mission described. Michaels construction (including all its auxiliary spacecraft and subsystems) takes place in secret under wartime conditions, perhaps the moniker is derived from a code name picked randomly (that’s how the 1958 Project Orion was named), or perhaps dockworkers handling the vehicle sections, packed in featureless cylindrical shipping containers strapped to pallets, named the craft, and it stuck. See Aldo Spadoni’s commentary on character-delivered descriptions on my Michael post.    

I built my Gunship around the 5"/54 caliber Mark 45 gun.

Nuclear Round

The nuclear round fired by the Gunship would be something akin to the UCLR1 Swift, a 622 mm long, 127 mm diameter nuclear shell, weighing in at 43.5 kg.

In 1958 a fusion warhead was developed and tested. At its test it yielded only 190 tons; it failed to achieve fusion and only the initial fission explosion worked correctly. There are unconfirmed reports that work on similar concepts continued into the 1970s and resulted in a one-kiloton warhead design for 5-inch (127 mm) naval gun rounds, these, however, were never deployed as operational weapons. See paragraph 9 (not counting the bulleted list) under United States Nuclear Artillery.

Gunship Crew & Crew Module  

The text of the novel is unclear on the number of crew manning the Gunships, but my opinion is no more than 2 would be required, and dialogue in the novel tends to back this up. The loading mechanism is automated, so only targeting and piloting skills are involved. Considering urgency involved in readying Michael, I doubt an entirely new capsule, man-rated for spaceflight, would be considered. Michaels designers would fall back on tried and tested designs and modify them as required. In this case a stripped down Gemini spacecraft and its Equipment Module fits the bill nicely. The life support system matches the mission requirements. Leave off the heat shield (these are one-way missions), and reaction control system—the capsule never operates separate from the Gunship rig. Mount targeting and firing controls for the gun. Probably a single hatch rather than Gemini’s double hatch, and internal flat-screen displays rather than viewports—looking on this battle with naked eyes would leave the astronaut seared, radiation burned, and blinded.

Propulsion
 
“The exhausts of the gunboats were bright and yellow: solid fuel rockets.” —from Footfall, pg. 454

Eight SRBs akin to the GEM-40 allow options: they could be fired in pairs, allowing four separate burns, or two burns of 4, or a single burn of all eight – needs depending. The SRBs are strapped around a ten foot diameter 40 foot long core containing ample tank stowage for hypergolic reaction control propellants, pressurization gas, and nitrogen for clearing the breech and gun barrel. The reaction control system is used to aim the gun; propellant expenditure would be prodigious.

1UCRL - University of California Radiation Laboratory
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Crystalegg's avatar

I see that you are selling prints of this. Just curious, if this is a 3D model, could you render an STL of the David and it's complement of vehicles for sale? This would be a great 3D print.

Crystalegg's avatar

I see that you are selling prints of this. Just curious, if this is a 3D model, could you render an STL of the David and it's complement of vehicles for sale? This would be a great 3D print.

Sinperium's avatar

Ah, SO cool.

And a great nod to classic science fiction (double bonus!)


I've had a fictional gun used I dreamed up as a teenager I call an "orbital hypercannon" which takes the multi-charge chamber design of of the WWII Nazi V3 "Vergeltungswaffen" concept (later refined and improved by Gerald Bull) and scale it up to use nuclear charges along the barrel length to continuously accelerate the projectile.


The barrel extends five kilometers kilometers and superconductive magnets powered by the fusion detonations add additional acceleration to the sabot round as it is driven down the barrel by oxygen-hydrogen propellant ignited by the nuclear blasts.


I'm hoping to come up with a story one day where I can use the thing and even have some mockups of a 3D model partly done.

Chrontius's avatar

I've actually read a fanfiction that used something similar in a Mass Effect AU in which the Protheans didn't give us any Eezo, just one hell of a warning.


https://www.fanfiction.net/s/9271192/1/Transcendent-Humanity


You'll find the relevant bits in chapter 14. Search term is "archer"

Sinperium's avatar

Hmmm. Using this weapon to propel a micro-singularity would be pretty cool.

We're going to need bigger bombs.

: )

I actually got motivated to go back and look at my model. I had stopped after designing a breech and loading mechanism to allow for on-the-fly builds of customizable munitions. So I'm taking a stab at finishing it up.


Again, your models are perfect.

Chrontius's avatar

I'm thrilled to renew your motivation!

Is this an orbital weapon? This would definitely make whole nations put up there hands and surrender!Lil' Cherry Chocolate Mousse Cake 
I remember reading that book back in the '80's and it is still one of my favorites! Too bad that novel never made it to the big screen.Dalek Gas Attack 
William-Black's avatar
No, this is a Gunship from Larry Niven and Jerry Pournelle's novel Footfall. These were small spacecraft, just enough ship wrapped around the gun and autoloader to provide life support for a two man crew. Read the description above then, to see the battleship that carried them, see my related post Michael for additional detail.
I assume pilots were given cyanide pills, should the gunship survive all the way until all 8 rockets are dead? Or did they just have easily-disengageable CO2 scrubbers, so the final inhales won't carry any usable oxygen? Or just a quick-to-remove helmets (or no helmets at all) and a quick way to vent the capsule free of air?
pyrodice's avatar

Their cyanide capsules were a megaton apiece. They'd never even feel it.

Chrontius's avatar

Haven't read the book, but I suspect that they'd already be inbound on the enemy with a magazine full of atomic hellfire.


If you can't launch them all, well… smoke 'em if ya got em!

William-Black's avatar
The design is from Larry Niven and Jerry Pournelle's novel Footfall. So, no need to assume, about cyanide pills or anything else, just read the novel.
I have read it... but it was long ago. I think refreshing my memory about it won't hurt.

By the way, great work! Now I can't help but picture "Stovepipes" like this when reading the battle scenes.
guny666's avatar
how biggest is the blast from one of the shells
Chrontius's avatar

Well, five-inch artillery shells IRL were tested by the US, and 105mm nukes theorized, for use in the Abrams, but never fielded. Little Feller 1 and 2 had yields of 18 and 22 tons respectively from a Davy Crockett nuclear bazooka.

Tube-type artillery had better ranges, and therefore much larger yields. Initially tested at 15 kilotons, smaller devices and larger devices were tested -- the most notable, in my opinion, was the M422 with a yield of up to 40 kilotons, and the XM-785 with a two kiloton yield… but that was also a neutron bomb. Its coupling efficiency to nearby targets was something like ten times better than conventional explosions, so at close ranges, it hit like twenty kilotons, and at long ranges, didn't create collateral damage (the __real__ reason for neutron bombs' compellingness; they generally killed instantly, or not at all, maiming few between the dead zone and the fine zone. That target coupling efficiency could cover up for a __much__ smaller blast yield!)

William-Black's avatar
See paragraph six in the text above. Under the big bold text: Nuclear Round

Words in a row, they are not just a decorative feature. They contain information, and links to even more information.
Chrontius's avatar

Well, five-inch artillery shells IRL were tested by the US, and 105mm nukes theorized, for use in the Abrams, but never fielded. Little Feller 1 and 2 had yields of 18 and 22 tons respectively from a Davy Crockett nuclear bazooka.


Tube-type artillery had better ranges, and therefore much larger yields. Initially tested at 15 kilotons, smaller devices and larger devices were tested -- the most notable, in my opinion, was the M422 with a yield of up to 40 kilotons, and the XM-785 with a two kiloton yield… but that was also a neutron bomb. Its coupling efficiency to nearby targets was something like ten times better than conventional explosions, so at close ranges, it hit like twenty kilotons, and at long ranges, didn't create collateral damage (the __real__ reason for neutron bombs' compellingness; they generally killed instantly, or not at all, maiming (relatively) few between the dead zone and the fine zone. (These ARE nukes I'm talking about…) That target coupling efficiency could cover up for a __much__ smaller blast yield!)

A shame that book never became a movie, great work!Wings of Fire NightWing Icon Emote 
What is gun barrel caliber or MM?
William-Black's avatar
See paragraphs 6 and 7 in the caption text.
Rojixus's avatar
To hell with space-fighters, I want this!
megadolon013's avatar
   Love this design.  Was this based on the 1960's era?
William-Black's avatar
No, the Gunship is based on this description “They take one of the main guns off a Navy ship. Wrap a spaceship around it. Not a lot of ship, just enough to steer it. Add an automatic loader and nuclear weapons for shells. Steer it with TV.” from the novel Footfall  by Larry Niven & Jerry Pournelle.

The novel came out in 1985. The story takes place in the (then) far flung future year 1995. So all of the technology I've selected is technology which existed before, or was contemporary at, the time of the story setting.

Footfall is arguably one of the best alien invasion novels ever written. If you haven't read the novel I highly recommend it, it's a great read.

This spacecraft is one of 14 Gunships which, along with 4 Space Shuttles, are mounted to a larger carrier spacecraft, the nuclear pulse propulsion battleship Michael. See my related post Michael for additional detail on the carrier spacecraft.

All of the rationale behind the design, the circumstances of its construction, why particular choices might be made, is described in the text right below the picture.  
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