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Avionics / Re: Orange Tartan navigation system
« Last post by JFC Fuller on Yesterday at 02:03:20 pm »
I just found a fascinating research paper whilst randomly googling the UK Skybolt/Vulcan integration effort and have attached it here. the interesting section for me as is as follows:

In 1956, the UK aircraft company A.V.Roe (“Avro”), based at Woodford, south of Manchester, was awarded the contract for developing an airborne astronavigation equipment to be capable of installation in British V-bombers (Valiant, Victor, Vulcan) - notably the Avro Vulcan, last of the line. This was to enable the aircaft to carry and launch the US air-launched ICBM (intercontinental ballistic missile) named Skybolt, then under development, but to be purchased for British use. I was recruited by Avro for the small research facility they were setting up for this secret purpose in Chertsey, Surrey, starting there in mid-1957.

The Skybolt guidance system was to be by inertial navigation, ‘astro-crutched’ by signals from within the carrying aircraft up to the moment of the missile’s release. Those signals were to be derived from the astronavigation system we were to design. The aircraft/weapon system was to be able to operate in ‘daylight’ at launch heights of 18,000-35,000 ft altitude, so sky brightness and brightness gradient were going to be important factors, in that the 2 stars needed had to be searched for and located faster than the drift rate of the aircraft’s inertial platform enlarged their patches of uncertainty on the sky, during the interval between precise-data input, just before takeoff from the ground, and attaining operating altitude. Thereafter, positional accuracy was to be maintained for a potentially long period of stand-off, pending any instruction to fire the missile.  Spatially, the third dimension was the flight altitude, independently known.

The two principal design responsibilities of the Chertsey establishment were (a) a telescope small enough to be alt-azimuth mounted on a small existing gyro-stabilized inertial platform, with star-search, detection and any other related facilities, (b) a navigation computer and related mathematics for instructing the telescope where to look and search for the pair of navigation stars selected as suitable at that moment from a prescribed list.

The source is here:
Modelling Forum / Re: Your 3D printing
« Last post by Bill S on March 19, 2018, 06:12:33 pm »

Waaaaaaaaaaaaaaaaaay late to the party. Did you ever get a bidder for the Vought AI-0505K?

Propulsion / Re: RD-701 tripropellant rocket engine
« Last post by Archibald on March 19, 2018, 10:26:51 am »
Great scot, that document is very interesting !
User Artwork / Re: 6th generation fighter concepts
« Last post by pedrospe on March 18, 2018, 07:49:51 am »
Hi everyone,i been working on this one for a while now,it is based on Rodrigo Avella J-50 and the Northrop Switch blade concept;


Yes, this is one M-20 variants.
Alternative History and Future Speculation / Re: Fictional Warships - Novels
« Last post by Graham1973 on March 18, 2018, 12:16:06 am »
An unexpected find...

Alex Lukeman, White Jade, 2011

United States

USS George Washington Carver (SSBN-???)
Ohio Class Submarine
Details as per the real ships
Note: Explicitly identified by the author as an Ohio Class Submarine. Name clashes with USS George Washington Carver (SSBN-656) a Benjamin Franklin Class Submarine in service 1966 - 1993. Another Ohio Class Submarine of this name appears in the technothriller 'Cold Sea Rising' (1985) by Richard Moran. The submarine in that novel had been modified to enhance underwater stealth. There is nothing in the current novel to indicate that the submarine is anything other than a 'stock' member of the Ohio Class.

USS Ronald Regan (CVN-76)
Nimitz Class Aircraft Carrier
Real ship, details as in service.

USS Tennessee (SSBN-734)
Ohio Class Submarine
Real ship, details as in service.

China (People's Republic)

Two Type 094 Class Submarines
Details as per the real ships.

Plot summary: A murder in California alerts the United States Government to the existence of a cabal in the Peoples Liberation Army with plans that could have catastrophic global consequences if they are enacted.

Notes: This is your basic Clive Cussler style adventure technothriller, making use of fringe archaeological ideas about the Minoans to drive the plotline, though in this case the bad guys are not searching for a supernatural source of globe dominating power, but one entirely within the bounds of reality. There is no specific dating information provided so the 'Day After Tomorrow' rule applies (e.g. a few years into the future relative to the publication date.).
Alternative History and Future Speculation / Re: Fictional Warships - Novels
« Last post by Graham1973 on March 16, 2018, 08:12:13 pm »
Jamie Campbell (Pseud.), The Terrible Aspect: A 1,370 ton short story of the sea, 2016

United Kingdom

HMS Leicester
York Class Cruiser
Details as per the real ships

HMS Exemplar
E Class Destroyer
Details as per the real ships

Plot summary: It is April/May of 1940, a British destroyer is sent to Norway as the campaign there winds down to pick up some Norwegian scientists before the Quislings or the Germans get their hands on them.

Note: As with the previous story, the author includes an afterward discussing their inspirations and providing additional details on the fictional warships appearing in it. This is also the sequel to 'The Mean Season' which I covered in the previous post and to date the last published story in the series. The authors biography on Amazon states that the authors name is a pseudonym.
Alternative History and Future Speculation / Re: Fictional Warships - Novels
« Last post by Graham1973 on March 16, 2018, 05:13:21 am »
Jamie Campbell (Pseud.), The Mean Season: A 5,150 ton short story of the sea, 2016

United Kingdom

HMS Cheltenham
C/Carlisle Class Cruiser
Details as per the real ships.
Not modified as an AA Cruiser.
Has been fitted with Radar (Type 79C (Fictional)) by December of 1939.
Speed: 27 knots (Current Max, design speed is 29 knots.)
Note: No specifics are given on the radars performance. It's simply stated that it's a prototype not suitable for mass production.


Cruiser, class not specified
Main Battery: 9 x 5.9 inch guns (Triple turrets A, X & Y)
Secondary battery/AA armament not specified.
Torpedoes: 9 x 20inch (500mm) Torpedo Tubes
Displacement: 6400 tons
Speed: 31.5 knots (Max)
Note: This is a fictional Wiemar-era design constructed between the Emden and the Konigsberg/Leipzig Class. The author states compromises have been made to the armor and range to fit in the weapons.

Two Destroyers, class not specified
Note: Author refers to these as 'Z-Boats'. The details given could fit either the Type 1934/34A or Type 1936 class.

Plot summary: It is December of 1939. An aging RN Cruiser has been dispatched on a critical test of a new system.

Note: The author finishes the short story with a long note in which they give the details of the fictional ships they created, which is rather nice. They also do not appear to have been aware of the Konigsberg Class as a separate entity from the Leipzig Class, even though they link to the Wikipedia page on the Leipzig Class in their end notes.
User Artwork / Re: Motocar's Cutaway drawings
« Last post by Motocar on March 15, 2018, 09:54:04 pm »
Blueprint "Copter-Jet" by Motocar
User Artwork / Re: Motocar's Cutaway drawings
« Last post by Motocar on March 15, 2018, 09:51:56 pm »
GI Joe beat you to it ;)

That's right, it's based on a GI Joe, but recreated in a more viable or feasible version proposed by R.T.P. to which I gave form, the Joe is unviable and too small to be real, there are many inconsistencies. The important thing is that at least he likes me and his comment is always welcome. regards  ;) :D
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