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Sturgeon's House


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Posts posted by Beer

  1. On 2/10/2017 at 7:49 AM, Toxn said:

    This thing is 'entertaining' to fly in sim. Sim pilots also know the pain of trying to get a German jet off the runway without lighting an engine on fire, as well as the joy of your engine/s melting because you got yourself low and slow and dared to throttle the engines past 70%.

    Lord knows how many real 262s burned up on the taxiway because the pilot was a bit too rough with the throttle lever...


    Maybe an interesting point here - Czechoslovakia operated 10 Me-262 after the war - seven S-92 (A-1a) and three CS-92 (B-1a). These planes were all built post-war - partially from wartime material, partially from newly produced parts (a lot of those were produced in Czechoslovakia already during the WW2). Four were made of unfinished airframes (LBB production), the rest from planes found on various airfields. Surprisingly they weren't many despite the fact that most of the remaining Me-262 units fought from airfields in Bohemia at the end of war. The planes were partially destroyed by fighting (in Prague Ruzyně mainly), destroyed by Germans themselves before capitulation or lost in combat and accidents. Few well-preserved were taken by Russians (1-2 probably). Overall 18 airframes were gathered (1 from Ruzyně airfield, 13 from Žatec airfield and 4 unfinished from České Budějovice factory). None were airworthy. It's also notable that even when you had 10 A-1a it didn't mean they were same. Actually there were differences in cockpits, hydraulics etc. based on production abilities of the split and decentralized suppliers). 


    The point why I'm posting it is that the engines were somewhat modified post-war but even with that and without sabotages (and proper testing before use in the aircraft) they didn't get to any massive raise of engine life. I don't remember exactly but I think they achieved something like 30 hours (which was still more than Soviet RD-10 I think). A lot of the problems were also with fuel filters which tend to get blocked at slower speeds. 


    If I remember right Bismarck from Military Aviation History channel mentioned that Jumo 004B were actually delivered to the units straight from the production lines without any testing. That greatly contributed to the low reliability of the engines.  


    Czechoslovak planes also had second (backup) hydraulic pump installed. They also flew with only two cannons (no idea why). Anyway while the planes were more reliable than the war production they still suffer from many issues and at least one was destroyed in accident (pilot survived landing in the field at 230 km/h). Two planes are preserved in Prague Kbely museum, one S-92 S.No.4 and one CS-92 S.No.5. 


    As a bonus Czechoslovak manual for Jumo-004B (M-4) engine



    One more thing to the engine reliability problems related to the lack of nickel, chromium and sabotages. This time with DB-605. On 13th August 1944 there was a battle between USAAF and Luftwafe over Czechoslovakia in which Luftwaffe lost 13 fighters (US lost 9 B-17 shot down and 1 B-24 fue to an accident). Out of Luftwaffe looses 5 Bf-109G-14/AS and 4 Fw-190A-8 were shot down by P-51 but another 4 Bf-109G-14/AS crashed due to an engine failure. That is 44% of Messerschmitt looses. None Fw-109A-8 crashed due to an accident in that encounter. 


    The absolute horrible reliability of late war DB-605 was one of the reason why many Bf-109G were rebuilt post war in Czechoslovakia with bomber Jumo 211 engines. These planes called Avia S-199/CS-199 were an absolute shit to fly due to an enormous reaction torque of the propeller but nevertheless they soon fought for Izrael... 

  2. Elta won Slovak tender for new 3D AD radars (medium, short, very-short range). Slovakia will buy six ELM-2084M-MMR, five ELM-2084S-MMR and six ELM-2138M. After Czechia and Hungary it's third Central European country which decided to buy Elta radars (logically all three neighbours can share certain part of service, training and mainteanance). 


  3. 1 hour ago, Kal said:

    Maybe slat armour will end up optimised for 57mm HEAT spam.


    How is it supposed to work? 


    1 hour ago, Kal said:

    Besides slat armour should be cheap to repair.


    That's purely secondary property and hardly a reason to carry it. The reason for slat armor existence is increase of surivability for the cost of extra weight, ridiculous dimensions, worse driving performance and harder accessability of most of the vehicle area. However it works only against very old HEAT grenades and only sometimes. It doesn't work against ATGM and newer RPGs at all (even against pretty old ones like RPG-18). When the vehicle is equipped with APS, which can deal with all those threats much better, there is no reason to diminish its performance by adding the cage. 

  4. 9 hours ago, Kal said:

    Can't shake the feeling that the redback will Look more complete with side slat armour for hull, and rear slat armour for turretfull


    Why to install slat armour on a vehicle with APS? Slat armour severly degrades vehicle mobility and somewhat protects only against very old anti-tank weapons which shall be an easy prey for the APS. 

  5. Some recently uploaded very rare footage from Czech Institute of military history. It's Czechoslovak team from 1937 Zürich Air Show. Four Avia B-534 reached second place in all air racing disciplines behind Germany (Bf-109B) but ahead of other teams (France, Italy, UK, Belgium and maybe some more). One of the pilots was František Peřina who later became the first Czechoslovak fighter ace of WW2 flying as a number two of French squadron leader Jean Accart in the famous CG I/5 "Cigognes". He shot down up to 14 German planes (12 confirmed, 2 probable) before being badly injured over Paris (he managed to escape to GB where he joined Czechoslovak unit in RAF, shot down another German aircraft and became a shooting instructor). 


    At one moment it's possible to see also acrobatic Avia Ba-122 which won the acrobatic contest both in single (František Novák) and group competition (ahead of Italian CR.32 team).   



    Unfortunately not a single B-534, wchich became the last bi-plane aircraft in history to shot down another aircraft (in late 1944 Slovak national uprising), survived to these days however you can see a nice (although not airworthy) replica in Prague Kbely muzeum. There is also one 75% flying replica here in CZ which can be seen from time to time in airshows (it's ultralight plane in fact). The acrobatic Ba-122 is preserved in Kbely muzeum in its original state. 

  6. When You posted this vehicle... do you know guys this thing? It's firefighting tank SPOT-55 based on T-55 chassis and produced by VOP-25 factory (now only VOP) in Czechoslovakia since 1991 (and Czechia after 1993 split). This tank has been in active use in basically every major fire in our country (forest fires, ammo dump accidents, chemical and ammo plant accidents etc.). It's big advantage is that it's optionally manned and can be operated remotely up to 1500 meters from the operator. Unfotunately I don't know how many were built but at least two are also in Saxony, Germany. 


    Technical data and many photos here (use google translate).



  7. Regarding the turn rate/climb rate question... I tried to find some info about bi-planes becase before WW2 those were generally rated to have high-climb rate combined with great turning abilities. I found following numbers (without guarantee): Fiat CR.32 (1934) 9,2 m/s; Gloster Gladiator (1937) 11,5 m/s; Fiat CR.42 (1938) 11,7 m/s; Grumman F-3F (1936) 14 m/s; Polikarpov I-15 (1934) 14,3 m/s; Polikarpov I-153 (1939) 15 m/s; Avia B-534-IV (1937) 15 m/s; Avia B-634 (1936) 16 m/s (not produced aerodynamically cleaned version but still with fixed gear). 

  8. On 8/9/2019 at 9:33 AM, TokyoMorose said:


    I know I am late here, but the loon wouldn't happen to be Ernst Kniepkamp would it? I know with the half-tracks and Panzer III he was directly the guy responsible for those elements - and the Tiger I work at Henschel was also his pet project of the time.


    And wait, I have Forcyk's book.... and yep it is Kneipkamp. Head of all tank projects at the Wehrmacht, and had been the chief army engineer even before the Nazi takeover when it was the "Military Automotive Department". Even the tiny Kettenkrad has the interleaved wheels, and yep the patent on that is "E. Kneipkamp".


    Sorry for being late to the party but I found it interesting that the to my knowledge not a single serial vehicle, prototype or concept coming from ČKD (BMM) or Škoda during the war had interleaved wheels (not even any paper project). In the end only one of those designed during the war made it to serial production - the Pz.38(t) n.A. chassis used on Panzerjäger 38(t) Hetzer (albeit the design was somewhat affected by the deliberate effort of ČKD chief designer Aleksey Surin to sabotage it, especially the early vehicles). It's notable that the companies had German management installed to oversee any development, yet they still insisted on not to use the interleaved wheels. In light of what you wrote it is also possible that Pz.38(t) n.A. lost to Pz.II Ausf.L Luchs for this reason because otherwise it was arguably the better machine for its task.   

  9. Another batch of trips from last fall. 


    Labe (Elbe river) near Terezín fortress (and WW2 concentration camp) after heavy rains. On the horizont on the left side there's Házmburk castle



    Jince town with military training grounds in the forests behind as seen from Plešivec hill. Brdy highland, central Bohemia.



    Křivoklát highland near Beroun, south-west of Prague. 



    Morning mist loosing the fight with the sun over the Labe (Elbe) river near Děčín city. Buková hora mountain with TV tower is visible on the horizont. 



    View from Blansko castle ruins near Ústí nad Labem city towards Krušné hory mountain ridge which creates a natural border with Germany.



    České středohoří mountains.



  10. On the 3D model it looks like something of 20 mm calibre or so, definitely not 35 or 40 mm. For the larger calibre IMHO the ammo capacity is a big and real problem. TBH I don't think it's a good idea at all to place a medium calibre coax on a tank. 

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