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Modelling Forum / Re: 3D printing
« Last post by Richard N on Yesterday at 10:04:45 pm »
3D printed parts are useful for prototypes or small part runs, but have nowhere near the surface finish or quick production cycles of injection molded parts. 

The surface finish of injection parts can be smooth as glass with fine panel lines and rivet detail while printed parts are covered with grow or printing lines and have to be hand or chemical finished to get a surface that is smooth but nowhere near the quality of an injection part.

Injection part cycle times are measured in seconds to minutes where the mold closes and is injected with molten plastic, cooled with water run through passages in the mold, and finally ejected from the mold.  Printed parts take from hours to days.  3D printing is okay for a single part or prototype, but impractical for most production.

Printed parts for production are practical for small runs of large parts where the run is too small to be worth investing in molds or tooling that would be feasible  for a larger number of parts.

Airfix has nothing to fear from 3D printers.
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Richard P. Henrick, The Phoenix Odyssey, 1986

United States

USS Phoenix (SSBN-???)
Ohio Class Submarine
Details as per the real ships
Armament: 24 Trident C-4 Missiles. Only 23 of the missiles are fitted with warheads. One carries a MILSTAR compatible communications satellite. 4 x 21 inch torpedo tubes (fwd), Mk 48 Torpedoes, Harpoon & Mk 70 Mobile Submarine Simulator (MoSS)
Note: The name not only clashes with that of USS Phoenix (SSN-702) a Los Angeles Class Submarine decommissioned in 1998, it does not fit the naming scheme used for Ohio Class Submarines (US States), even if the author explicitly identifies it as such.

The reason that one missile is fitted with a comsat is part of the submarines current operating procedure. In the event of a prolonged period of silence following an alert (Without a positive fire order being received.) the submarine is to deploy the satellite and if no communication is received within a specified time period the remaining missiles are to be fired at their targets.

USS Orca (SSN-???)
Sturgeon Class Submarine
Details as per the real ships.
Sunk: 1971
Note: Features in a characters backstory. Author explicitly identifies this submarine as a member of the Sturgeon Class.

Delta Base
A "...fully equipped , submarine refitting station." Constructed in secret inside a hollowed out seamount in the Vava'u District of Tonga.
Nuclear powered.
No other details provided

Unnamed
2 x Spruance Class Destroyers
Details as per the real ships.

Russia

Minsk
Kiev (Pr.1143) Class Aircraft Carrier
Real ship, details as in service.

Azov
Kara (Project 1134B) Class Cruiser
Real ship, details as in service.

Boris Chilikin
Boris Chilikin (Pr. 1559V) Fleet Oiler
Real ship, details as in service
Note: Armament is modified. Given in novel as 2 x 100mm guns, 1 x AK-630 30mm gatling gun & 1 x SS-N-2 Launcher (Currently carrying a SS-NX-12 missile.). In real life the armament was 2 x AK-725 57mm & 2 x AK-630 30mm gatling guns.

The missile being carried by the Boris Chilikin is a prototype intercontinental cruise missile, not a prototype of the missile that was historically given the designation. Few specifics are given beyond the fact that the weapon is nuclear armed, fitted with a TERCOM guidance system based on pre-programmed way-points and has a range capable of reaching Seattle from a point in the East Siberian sea. Some clues as to dimensions can be worked out based on the fact that a launcher designed for the SS-N-2 Styx missile is being used for the test launch.

Magadan
Alfa (Pr.705) Class Submarine
Details as per the real ships

Unnamed
2 x Udaloy (Pr.1155) Class Destroyers
Details as per the real ships save that the SA-N-9 AAMs have been replaced with a fictional ABM capable missile designated SA-N-10. The actual SA-N-10 is a derivative of the Igla man portable SAM missile.

Plot summary: It is the day after tomorrow, the Soviet Union prepares to launch Operation: Lenin, a massive naval exercise designed to show once and for all that the Soviet's rule the waves. One key component of this is the launching of a prototype cruise missile, when the missile goes astray it causes a major crisis and in the confusion contact with one submarine is lost. Now the race is on to contact her before she launches.

Notes (Spoilers): Richard P. Henrick (b. 1949) is an author of submarine based fiction for cheap mass market paperbacks active in the 1980s and 1990s who shot to prominence with the making of the film 'Crimson Tide' (1995) for which the author contributed a novelization of his own script. Interestingly the plotline of 'The Phoenix Odyssey' feels like the 'prototype' for the film with the key conflict being between the Phoenix's captain and a US Navy Geologist the submarine is transporting that certain events are the result of natural causes and not the outbreak of WWIII. This may have resulted from the author taking inspiration from an incident during the Cuban Missile Crisis in which the crew of a Russian submarine clashed over whether or not to fire a nuclear torpedo at an American warship.

As to dating when this one is set, the author gives no specifics, most likely it's supposed to be set a few years downstream of the publication date. However in one scene he has the USS Phoenix receive a message using an Extremely Low Frequency radio system, this was something the US Navy set up in the early/mid 1980s. But, the version the author mentions 'Austere ELF', was not what was constructed in the 1980s, but a more capable system proposed in the late 1970s, which raises some interesting questions about just when the story was written.

As with a lot of technothriller type novels written in this time period (Late 70s to mid 90s) the novel has a 'future of the past' quality about it. Other novels exhibiting this 'future of the past' quality are 'Thirty-Four East' (1974), 'The Hastings Conspiracy' (1980) (Both by Alfred Coppel) & 'North Star Crusade' (1976) (William Katz) and 'End Game', 2011 (Matthew Glass), along with what is probably the most well known 'alternative history' sequence, 'Raise the Titanic' (1976), 'Vixen 03' (1978), 'Night Probe' (1981) & 'Deep Six' (1984) (All by Clive Cussler) which are set in an alternative 1980s (The novels are set between 1987 ('Raise the Titanic') & 1989 ('Deep Six').) with many differences from what actually happened, most notably Canada being absorbed by the United States (Something Cussler quietly dropped in later novels.).
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If the Army is truly committed to NGCV Class III a large caliber  (152mm or 155mm) Direct Fire/Indirect fire 40ton vehicle then there will need to be a new 20ton base vehicle (The most important vehicle and replacement for the M1 in the Army's future is a NGCV Class III IMHO.) It would only make sense that a baseline vehicle be used for the Optionally Manned Fighting Vehicle (OPMFV).

 If the Army can not pay for a new design which can house a 9 person exoskeleton equipped squad plus yet to evolve squad small UGVs (certainly not yet close to evolved and need to be DoD development based not the COTS toys) then they should just look at an extended hull, enhanced turret Bradley mounting armed VTOL UAVs (also needing a DoD development as current COTS is crap) until they are ready for new vehicle. A new propulsion strategy will cost more as well and is also is not on any "on market" vehicle.

A half measure "on the market" OPMFV would be cheaper than a new baseline vehicle and it would also obsolete before it enters service.  Overall that is a more expensive strategy than just waiting to afford a decent vehicle. No 'on the market vehicle" is "Next Generation". That is a joke.

 
https://ndiastorage.blob.core.usgovcloudapi.net/ndia/2018/science/Singleton.pdf
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Designation Systems / Re: SNCASE / Sud-Est Aviation designation (SE)
« Last post by hesham on October 16, 2018, 08:07:47 am »
Some Corrections from The Aviation Historian 25,

SE-1020  was a maritime-patrol version equipped with gun-turrets
SE-1030 & SE-1035  were a stratosphere transport variants,with wider fuselage
SE-1040  was a version powered by four Rolls-Royce Dart turboprop engine
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that's right my dear Jemiba.
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I wonder how small the engines would need to be ...

Reminds me of this design, with two really small engines :#

https://www.secretprojects.co.uk/forum/index.php/topic,5943.msg48832.html#msg48832
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Give me a few days and I will copy the original article from The Aeroplane
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It definitely needs wheel pants to reduce the number of rocks thrown into propellers.
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Theoretical and Speculative Projects / Re: Grey Detachable Twin-Hull Flying Boat
« Last post by hesham on October 15, 2018, 05:03:00 am »
OK.
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