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Poslao: 02 Dec 2017 21:19
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- nebkv
- Legendarni građanin
- Pridružio: 30 Mar 2007
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E tako se to radi 
Uvek se odusevim kada vidim eksponate muzeja u Pivki
I podmornicu su uvrstili u postavku,a mi,gde je nasa...
Ma i ne zasluzujemo bolje 
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Poslao: 17 Feb 2018 13:03
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- Skywhaler
- Legendarni građanin
- vampire and philosopher, po©smt, rhd©t
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... са линка који је дао Саша92БГ:Citat:... Razvoj bi verovatno tekao brže da USAF nije prvobitno tražiol da novi lovac mora imati brzinu od najmanje 521 čvora (938 km/h), borbeni radijus dejstva 738 nautičkih milja (oko 1330 km) i naoružanje koje bi se sastojalo od osam teških mitraljeza kalibra 0,50 inča (12,7 mm) ili šest teških mitraljeza kalibra 0,60 inča (14.6 mm)...Искрено, овде сам био затечен, пошто ништа нисам знао о авионском наоружању тог калибра, па сам мало чепркао по нету. Изгледа да су аутори погрешно пренели или погрешно рачунали, пошто није у питању калибар 14,6 већ 15,2mm:Citat:... From 'Flying Guns of World War 2: Development of Aircraft Guns, Ammunition and Installations 1933-45' by Emmanuel Gustin:
"The Americans constantly searched for higher muzzle velocities in their HMGs, producing experimental weapons mainly based on the Hispano (T18 series) or MG 151 (T17 series) cannon. The T18s were adapted to 15 mm or .60" calibre, but the conversion turned out to involve too much work so they were dropped. The T17 was developed to accept the US Army's experimental .60" anti-tank cartridge (15.2x114) in a project which started in 1942 and continued until 1946, achieving orders for up to 5,000 weapons and production of about 300, none of which saw service. The T17E3 weighed 61 kg and achieved only 600 rpm; the T17E5 reduced the weight to 58 kg and speeded up the mechanism to 700-750 rpm. There was also a Johnson short-recoil design chambered for both the 20x110 HS 404 round and the necked-down 12.7x120 high velocity version (.50" HV), but this was equally unsuccessful.
The ammunition used by these weapons was impressively powerful for the calibre. The .50" HV achieved over 1,220 m/s with a 46 g bullet, the .60" anti-tank cartridge fired a 76 g bullet at 1,100 m/s, and a necked-down .50" version (12.7x114) propelled a 43 g bullet at 1,200 m/s, or 32 g at 1,340."
As a matter of interest, the .60 cartridge was also used in some postwar designs, namely the Vulcan rotary and the revolver cannon which became the M39, but it was rejected in favour of a necked-out version of the cartridge - the 20x102 - which is still in use today in the M61 Vulcan and various other guns... https://www.warbirdsforum.com/topic/462-what-ever-happened-to-the-60-cal/
https://www.amazon.com/Flying-Guns-World-War-II/dp/1840372273
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Poslao: 17 Feb 2018 13:52
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^
Danko je u uvodnom postu takođe naveo 14.6mm. Ustvari, kad se malo bolje pogleda, izgleda da je na tom linku samo prepisan prvi post ove teme 
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Poslao: 17 Feb 2018 16:09
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Pitanje je da li je taj kalibar tačno 0.60 ili približno?
14.6mm je oko 0.575".
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Poslao: 17 Feb 2018 16:52
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- Skywhaler
- Legendarni građanin
- vampire and philosopher, po©smt, rhd©t
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Napisano: 17 Feb 2018 16:51
... питање је на месту, али нигде не видим да се помиње тих 14.6... ево и једног текста са интернета који пише да је базиран на тексту из часописа Guns Review (April 1994) у којем је дато поређење калибара...
За ову нашу дискусију значајан је следећи део, уз илустрацију:Citat:... Based on the US .60" T17 and the Soviet 14.5mm ATR...
In 1939 the US Army issued a requirement for an anti-tank rifle capable of penetrating 1¼" (32mm) of armour at 500 yards (460m). This produced the massive .60" cartridge (15.2x114). The rifle never saw service, neither did the T17 aircraft machine gun (developed from captured Luftwaffe MG151) which was intended to use it. Different designs of .60" machine guns (including revolver and rotary versions) were experimented with but without success... http://www.quarryhs.co.uk/MilRel.htm
... углавном, свуда се јасно наводе цифре 0.60, односно 15,2 (или 15,24)...
Dopuna: 17 Feb 2018 16:52
... то ће нама на крају Данко лепо елаборирати у својој књизи... 
Интересантно је да се ни Руси нису усрећили са својим калибром 15,5. Из истог текста:Citat:... The 15.5x106 was FN's second effort (after the 15x115 shown above) to make a KPV competitor in the BRG-15, appropriately by necking out the KPV's case, While it seemed to work well enough, it never found any customers and the gun effectively bankrupted the company. Not surprising, really; anyone wanting a gun in that class could have bought the KPV for a lot less cash...
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