Steve Jackson Games - Site Navigation
Home General Info Follow Us Search Illuminator Store Forums What's New Other Games Ogre GURPS Munchkin Our Games: Home

Go Back   Steve Jackson Games Forums > Roleplaying > GURPS

Reply
 
Thread Tools Display Modes
Old 07-14-2010, 04:57 PM   #1
copeab
 
copeab's Avatar
 
Join Date: Mar 2005
Location: near Houston
Default [WWII] Christie M-1932 flying tank (USA)

Christie M-1932 flying tank
Copyright 2010 by Brandon Cope

J. Walter Christie was an eccentric American tank designer of the inter-war period. In addition to rather fanciful concepts, he also tended to have short attention spans for designs, rapidly moving on to new ideas before fully developing an existing one. His most famous invention was a simple and reliable suspension system, made famous on the Soviet T-34. His most bizarre invention was the M-1932 flying tank.

The basic idea was laudable: a way to break static trench warfare by delivering armored forces behind the enemy's front lines. The M-1932 was a turretless tracked vehicle equipped with jettisonable wings and propeller – once the tank had flown deep within enemy territory, landed and shed it's wings, it was envisioned it would zip around rear areas at 70 mph, disrupting the enemy's ability to fight. It was even postulated that such a machine would end warfare! Like most of Christie's designs, it was 'convertible' and could run on tracks or the large road wheels alone.

Only a wingless prototype was built, with only half the speeds hoped for. Christie abandoned the design in his typical manner and moved on to other projects. The design below is based on the extremely optimistic article in Modern Mechanics magazine (July 1932). The only significant change is the addition of a third crewman. In a Cliffhangers or mad science WWII campaign, the M-1932 would fit in well.

The M-1932 has a crew of three: commander, driver and gunner. The M-1932 uses 33.6 gallons of aviation per hour at routine usage in flight, 15.8 gph on the ground.

Subassemblies: Medium Tank chassis +3, Light FB Wings with biplane option +4, tracks +3.
Powertrain: 746-kW aerial HP gas engine w/ 350-kW tracked drive train, 746-kw prop and 60 gallons fuel in standard fuel tank [body]; 16,000-kWs batteries.
Occupancy: 3 CS* Cargo: 5

Armor
Body: F: 4/75, RLB 4/40, TU 4/20
Tracks: 4/35
Wings: 2/2C

Weaponry
75mm Short TG [Body:F] (64).
Ground LMG/M-1919A4 [Body:F] (1,000).

Statistics
Size: 20’7’12’
Payload: 0.39 tons
Lwt: 7.22 tons
Volume: 88
Maint.: 37 hours
Price: $29,500
HT: 10
HP: 375 [Body], 135 [Each Track], 125 [each wing]

gSpeed: 36
gAccel: 6
gDecel: 20
gMR: 0.25
gSR: 6
GP: Very low (4/5)

aSpeed: 125
aAccel: 3
aDecel: 12
aMR: 3
aSR: 1
Stall: 54

Design Notes
Chassis cost, weight and HP were divided by four and wing numbers divided by two to represent the light design. Chassis cost was not multiplied by 10 as is normal for an aircraft chassis, since it really wasn't any better streamlined than any other Christie tank.

The M-1932 theoretically could run at 100 mph on the road wheels with the tracks removed. The removable wing assembly weighs 0.7 tons; it is included under loaded weight but not Payload. An alternate main armament could be a 37mm Medium TG with 180 rounds. Earlier in the decade, it would be armed with something more similar in performance to a 76.2mm Very Short Howitzer or 37mm Infantry Gun.

The prototype could only manage 36 mph on tracks and 50 mph off, too slow to allow takeoff. Given the quality of tracks and tracked transmissions at the time, a sustained speed of 70 mph is perhaps more unrealistic than flying (and a crew in such a vehicle would be beaten to a bloody pulp going at top speed across country).
__________________
A generous and sadistic GM,
Brandon Cope

GURPS 3e stuff: http://copeab.tripod.com

Last edited by copeab; 08-06-2010 at 04:37 PM. Reason: added wing HP
copeab is offline   Reply With Quote
Old 07-19-2010, 02:07 PM   #2
Phaelen Bleux
World Traveler in Training
 
Phaelen Bleux's Avatar
 
Join Date: Apr 2005
Location: Chicago, IL
Default Re: [WWII] Christie M-1932 flying tank (USA)

Quote:
Originally Posted by copeab View Post

The M-1932 theoretically could run at 100 mph on the road wheels with the tracks removed.
Is this the design gSpeed or a historical engineering theoretical?

Also, there are no HPs listed for the wings, just in case someone wants to shoot it down.
__________________
"People demand freedom of speech as a compensation for the freedom of thought which they seldom use." -- Kierkegaard

http://aerodrome.hamish.tripod.com
Phaelen Bleux is offline   Reply With Quote
Old 07-19-2010, 03:11 PM   #3
copeab
 
copeab's Avatar
 
Join Date: Mar 2005
Location: near Houston
Default Re: [WWII] Christie M-1932 flying tank (USA)

Quote:
Originally Posted by Phaelen Bleux View Post
Is this the design gSpeed or a historical engineering theoretical?
Excessive optimism by Christie.

Quote:
Also, there are no HPs listed for the wings, just in case someone wants to shoot it down.
Added. (125 each)
__________________
A generous and sadistic GM,
Brandon Cope

GURPS 3e stuff: http://copeab.tripod.com
copeab is offline   Reply With Quote
Reply

Tags
flying tank, j. walter christie, usa, wwii

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Fnords are Off
[IMG] code is Off
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 03:43 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2017, vBulletin Solutions, Inc.