Wednesday 14 February 2018

Supersonic Hun



Historical Background
In early 1949, with the wealth of captured German aerodynamics data, North American Aviation began researching for sustained Mach 1 flight. In January 1951 while its subsonic F-86 fighters were clashing successfully with the MiG-15 over Korea, North American Aviation handed an unsolicited proposal to the USAF for a supersonic day fighter named Sabre 45 because of its 45° wing sweep and being an evolution of the Sabre. The aircraft would be powered by a Pratt & Whitney J57 turbojet which provided the best performance among the early jet engines. In July 1951, the mock-up was inspected and after over a hundred modifications were made, it was accepted as the F-100 on 30 November 1951. In January 1952, the USAF ordered 23 prototypes (YF-100) followed by 23 F-100A models in February and another 250 in August.

Like the F-86, the F-100 has a nose-mounted air intake although thinner and more oval than the original Sabre. The wing of course has more sweep angle than the F-86 and it was also thinner. Decision was also made to move the ailerons inboard, allowing the Super Sabre to have a better rate of roll. Internal armament consists of four Pontiac M39E 20-mm cannons while external ordnance can range from unguided rockets to tactical nuclear weapons. The pre-production YF-100A first flew on 25 May 1953, seven month ahead of schedule, while the first production F-100A was first flown on 9 October of the same year. Test pilots however noted lack of stability at high speeds leading to inertia coupling. Although officially entering service on 17 September 1954 with the 479th Fighter Wing, the USAF declared that it was not ready for large-scale deployment due to deficiencies in the design. By November 1954, there were six major accidents including one on 12 October 1954 which killed North American's chief test pilot, George Welch.

The accidents forced the USAF to ground the entire fleet until February 1955. Because of the still existing problems, the A model was taken out of service beginning in 1958 with the last aircraft leaving active service in 1961. During that time another 47 'A' models were lost to attrition. The F-100A's place was taken by the 'C' model, which was built to satisfy Tactical Air Command's need for a fighter-bomber. The F-100C has longer wings to improve roll but otherwise similar to the F-100A and having all its problems. The inertia coupling was partially solved when the fleet was fitted with yaw and pitch dampers. To allow carriage of weapons and extra fuel, six hardpoints were made available underneath the wings. However not all F-100Cs can carry conventional munitions and like the A model, it suffered from attrition, losing 85 by the time the variant was retired in 1970.

The final single-seat version, the F-100D, became a dedicated ground attack machine with secondary air-to-air fighter capability. Key features of this variant include autopilot, in-flight refueling, ECM equipment and Sidewinder capability. To further address the dangerous flight characteristics, the wing span was extended by 66 cm and the tail area increased by 27%. 65 of the D model were modified to fire the AGM-12 Bullpup missile. As a type, the F-100 received numerous modification programmes during its service life. Many were concerned with the structure, electronics and to improve ease of maintenance. One of them was the replacement of the afterburner can with the one from retired F-102 Delta Daggers.

The F-100 saw combat service during the United States' involvement in Vietnam. Six Super Sabres were deployed to Don Muang air base in Thailand on 16 April 1961, acting as the vanguard for the type's involvement in the conflict until withdrawn in 1971. The Super Sabres mainly acted as fighter-bombers giving close support to ground troops and anti-MiG escort while two-seat F-100F model acted as Forward Air Controllers and performing the first anti-radar, Wild Weasel missions. By the end of their deployment on 31 July 1971, Super Sabres have logged 360,283 combat sorties : just four wings of F-100s have clocked a larger number of combat sorties than their WW2 predecessor, the P-51. Despite being used as escort fighters flying into North Vietnam early in the war, the F-100s recorded no MiG kills, save for one 'probable' on 4 April 1965.  No F-100s were shot down by enemy fighters but 242 were lost through other causes (186 by AA, seven from sapper attcks and 45 in operational incidents).

The F-100 was also used by Turkey, France, Denmark and Taiwan. The last-named received ex-USAF F-100As which were retrofitted with D model vertical tails. A number was lost during reconnaissance missions over China. The Super Sabres of the Armee de l'Air was used during the Algerian War of Independence.

The Kit
The Tamiya kit was released in 2001 following the original Italeri release in 1998. It was originally thought to be a straight re-release of the earlier, 1980s-vintage ESCI kit. Close inspection revealed that while the Italeri kit may indeed a re-release, there are some difference between it and the earlier ESCI kit. as follows:
1. An extra, non-existent frame on the canopy
2. Shorter (275- US gallon) fuel tanks
3. More detailed landing gear parts
4. Raised details for the instrument panel
5. Better-detailed ejection seat(s)
6. External ordnance

The kit engineering is fairly simple but it featured nicely engraved panel lines. Two types of exhaust nozzles were included - standard and the F-102 type. However the air intake is fairly shallow and ended at the cockpit. The decal sheet feature markings for three aircraft - each from USAF, Armee de l'Air and the Danish Air Force.

Construction
As nearly always with aircraft model kits, construction started at the cockpit. Also, as usual I painted the parts while still on the sprue - Gunze Aqueous H317 for the majority of the cockpit and seat, Tamiya XF-1 for the instrument and side panels and  the sidewalls white for the switches and dials. While having more details than the original ESCI kit, they were quite pitiful compared to other kits in the scale. Before joining the fuselage halves together, a ballast of 20 grams was placed at the nose (I just crammed plasticine in the nose halves until it feels 'right'). The wing parts were assembled; no problems here really, but the wing fences were a bit loose in their slots. As the intake trunking was non-existent, the 'bulkhead' was painted black before the intake was cemented to the fuselage. The intake-fuselage joint was not smooth and I had to sand the area for a seamless joint. Another area with bad fit was the lower tray on the fuselage (with two troughs for the two of the cannons) - I still wonder why do they have to make that area separate. As the canopy is a one-piece affair and a couple of decals go on both the canopy and the fuselage, it was attached and masked off. However, like the lower tray mentioned above, the canopy-fuselage fit was not great.

Painting and Decalling
I decided to finish the kit as a Hun from the 353rd TFS, 354th TFW (based at Myrtle Beach, Florida) 1958. Tamiya's instructions have you paint the interior compartment silver but I am of the opinion that they were actually painted US Interior Green. So I made a mix of 2 parts XF-5 Flat Green to one part XF-3 Flat Yellow paint the interior accordingly. The unpainted rear fuselage (on the real aircraft) was painted a mix of Gunze 8 Silver and 61 Burnt Iron while the exhaust was painted straight Burnt Iron. After masking, the rest of the fuselage was painted Tamiya TS-30 Silver Leaf (although with hindsightI think TS-17 Gloss Aluminium would be more appropriate). Afterwards the decals were applied. No problems here as Italeri's in-house decal are pretty good. Inside faces of landing gear bay covers and the airbrake were painted Gunze Silver 8. Tamiya Weathering master 'Soot' was used on the exposed metal area of the fuselage to simulate heat weathering (maybe other shades or colours were more appropriate but that's what I have in my arsenal).The decals were the treated to the usual decal solution application.

Finishing
I forgot to mention that I tried to remove that extra frame on the canopy. While it was removed without a hitch, the clean-up process went awry in the sense that I could not get the canopy clear again - not sure why but I guess my sandpaper were not fine enough (just down to 1500 grit only). Anyway, lesson learnt - try find finer grade of sandpaper and more importantly, do on scrap plastic before committing yourself. As usual, the landing gears were added first to allow the model to stand on its 'feet'. As for 'things under the wings', I decided to substitute the M117 bomb and rocket pods with a pair of AGM-12 Bullpup and a pair of Mk 81 bombs. Both are from Hasegawa weapons sets. The Bullpup has raised mould parting lines while the bombs have a pair of ejector pin marks, all of which needed cleaning up. Flat clear was sprayed onto the bombs while the Bullpups received a semi-gloss coat. Although many photos show USAF Super Sabres have their speed brakes raised while on the ground, I have them lowered for added visual interest. Some paint touch-ups were needed after removing the masks.There was no locating hole on the wing surface for the refuelling probe so I have to cut off the locating tab and just use Mark I Eyeball to place the aforementioned probe.

Conclusion
Although rather old, the Tamiya/Italeri/ESCI F-100 kit is still a good model. The glitches in the kit are rather minor and any reasonably competent modeler can sort them out (and count me out for that). Coupled with a rather low price (I got mine for RM36.00 which I think is half the price of of Hrumpeter's Hun) it was indeed a bargain.

Sunday 4 February 2018

турбинный таик!



Historical Background
The T-80 series of Soviet and its successor states' MBTs can trace its origins to turbine-powered tanks proposals designed by one A. Ch. Starostienko for Leningrad Kirovsky Zavod (LKZ) in 1949. The tanks were never built because of very poor quality turbine engines of the time. In 1955, two prototypes were built at the same plant utilising 1,000 hp turbine engines by a team led by one G.A. Oglobin. Two years later, a team led by Josef Kotin constructed two prototypes of Obyekt 278 heavy tank, which were hybrids of the IS-7 and T-10 tanks, powered the GTD-1 turbine engine. Although weighing 53 tons and armed with a 130mm gun, the tank can reach a top speed of 57 km/h. It's range was poor however, due to high fuel consumption. The project was not resumed, not because of economic considerations, but also because of the death of Stalin in 1953 precluded any further work on heavy tanks.

In 1963, the Malyshev Factory in Kharkov, designed a variant of the T-64 tank dubbed the T-64T, powered by 700-hp GTD-3TL turbine engine and was tested until 1965. At the same time, the Uralvagonzavod factory created Obyekt 167T tank, powered by an upgraded (801 hp) GTD-3T turbine. In 1969, another team from LKZ, led by Nikolai Popov, designed a turbine-powered tank designated Obyekt 219 SP1, using the new GTD-1000T multi-fuel gas turbine developed at KB-3 of the LKZ since 1968. It was later renamed T-64T. The increased weight and dynamic characteristics of the more powerful engine than previously used required a complete redesign of the drivetrain and tracks. This resulted in Obyekt 219 SP2 with larger road wheels and return rollers while the road wheels was increased to six (from five previously). The turret was modified to use the same compartment, the 2A46 125mm gun and the autoloader as the T-64A tank. In 1976, Obyekt 219 SP2 was accepted for service as the T-80.

The T-80 has a similar layout with the T-64 with the driver at the front centre of the low, highly sloped hull. The two-man turret has the commander located to the right and the gunner to the left. Apart from welded steel RHA and laminate armour, the sides and the lower hull of the T-80 were protected by rubber flaps and skirts against infantry anti-tank weapons. Power from the engine was transmitted through a manual transmission system with five forward and one reverse gears. The hydropneumatic suspension of the T-64 was replaced with the conventional torsion bar system. The 125mm 2A46 gun was similar to the one arming the T-64 and was loaded using the Korzina automatic loader. While reliable, the system took between 7.1 to 19.5 seconds to load, depending on the initial position of the ammunition carousel.

In 1978, the improved T-80B was introduced. This model featured a new turret, laser rangefinder, fire-control system and a new autoloader. This allowed the B model to fire 9M112 Kobra (NATO AT-8 Songster) anti-tank missiles (and later supplanted by the 9M119 Refleks / AT-11 Sniper missile). In 1980, a new SG-1000 engine rated at 1,100 hp was fitted. In 1982, the B variant received a new gun and in 1985, fittings for explosive reactive armour (ERA) blocks were received. In the same year, Kontakt-1 ERA blocks were fitted to the T-80B, resulting in the T-80BV. The smoke grenade launchers were relocated to the sides of the turret to make way for the ERA bricks. On the front of the turret, the ERA blocks are joined to form a shallow chevron. ERA is also fitted to the front roof of the turret to protect against top-attack weapons such as the Swedish RBS-56 BILL and the BGM-71F version of the TOW missile. While giving additional protection against HEAT rounds, the Kontakt-1 ERA was not effective against APDS and APFSDS rounds. Further development resulted in the T-80U series. Ukraine pursued further development of the T-80, resulting in the diesel-powered T-80UD and the T-84.

Between 1986 through 1987, 2,256 T-80/T-80B/T-80BV were stationed in East Germany and by the time of the break-up of the Soviet Union in 1991, 4,839 T-80s of all variants were operated by the Soviet Army. Their high speed and powerful armament led concerns in the NATO, leading towards the increase of the development of attack helicopters and anti-tank guided weapons. However, instead of leading the Soviet drive to the Bay of Biscay, they were first deployed during the political and economic turmoil in Russia in the early 1990s. They were first deployed in August 1991 during the attempted coup by hard-line communists and their allied military commanders against Mikhail Gorbachev. T-80UDs of the 4th Guards Kantemirovskaya Tank Division drove onto the streets of Moscow but the crews' refusal to fire on the crowds and the parliament resulted in the failure of the coup. In 1993, during the Russian constitutional crisis, T-80UDs of the same Division was called upon by president Boris Yeltsin. Six tanks of the 12th Guards Tank Regiment took positions on the bridge opposite the Moscow White House and fired on it.

The true test for the T-80 only came during the First Chechen War. However, they were used in the effort to capture Grozny, a task unsuitable for MBTs and suffered accordingly. The tank crews were inexperienced, whereas the Chechens were mostly veterans of the Soviet war in Afghanistan. The T-80s used in the campaign were either baseline T-80B models without ERA blocks or having their ERA blocks empty. Furthermore RPG shots were aimed at the weakest part of the armour. Some tanks suffered catastrophic explosions when the ready rounds in the vertical carousel exploded after contacting the molten jet stream from a HEAT warhead. The T-80 performed so poorly, in that General-Lieutenant A. Galkin, the Head of Armour Directorate, convinced the Ministry of Defence never to procure gas-turbine tanks. In all 225 tanks were destroyed. But the Russians learnt the lesson and the T-80s only gave support to infantry from a safe distance during the Second Chechen War. Nevertheless, the high operating cost of the T-80 precluded its use in subsequent conflicts.

Unlike the T-64, the T-80 was exported to a number of countries, including South Korea (as payment for Soviet-era debt), Egypt, Cyprus, Pakistan and Yemen.  

The Kit
As part of Trumpeter's wave of Soviet/Russian AFV kits, the T-80BV was released together with the baseline T-80B in 2013. The parts were laid across 27 plastic sprues (including 1 clear), two PE frets, the turret shell, the lower hull, a length of braided copper wire plus a decal sheet. No turned metal barrel was included. The parts look well-moulded and based on my experience with the T-64, should have a good fit. Unlike the T-64 however, Trumpeter provided certain parts in plastic as an alternative to PE parts. The turret frontal ERA blocks, a scourge on the already less accurate Dragon kit of the 1990s are of multi-part assembly. While more involved, they should be of better placement. There are a few errors in the instructions and instead of adding an errata sheet, Trumpeter sticked on the revised instuctions where approrpiate. Decals provide markings for four vehicles, all without description:

1. 410, Green (probably during the Soviet era);
2. 41, Green, Tan, Black (current, usually seen during parades)
3. 703, Green, Sand, Grey (probably during the withdrawal of the former GSFG)
4. 210, Green, Black, Grey (current)

Construction
As usual, construction started at the lower hull. The first step is concerned with wheel assembly but I skipped them and go straight for the lower hull. At a first glance, the lower hull featured a lot of detailing and as work commenced it sure involved quite a lot of work: the shock absorber alone consists of five plastic and one brass PE parts, and there are six of them. To save time, I used plastic alternatives instead of PE parts where applicable. Small details on the entrenching blade were left off as they would be hidden by the dust flap. And talking about the latter, Trumpeter provided them in plastic and vinyl. Also, the return rollers were not cleaned up as they would also be hidden behind the RPG skirting. The suspension arms, although having positive alignment tab, were quite loose and I managed NOT to line up the wheels properly. As per my usual style, the lower hull and the wheels were painted at this time (with the wheels still on the sprue). The paint were touched-up after the wheels had come off the sprue. Also, only the outside wheels have their seam lines cleaned up.

Work on the upper hull started by drilling 28 holes into the front glacis plate. This was followed by adding small details onto the plate and once done, the ERA blocks. The holes drilled to fit most of the blocks were symmetrical so you have to make sure the orientation of the blocks before cementing them (I got the main block (part M15), the other way round initially). The completed upper hull was then cemented to the lower hull pan. The engine deck was next. Nothing unusual here except that the mesh for the air intakes were of separate panels, creating extra work. Before proceeding any further, the tracks were assembled and painted. The guide teeth were separate so I add them to the link before joining them together. Again, I got lazy and left the upper run of the track altogether. The fenders were then assembled. Trumpeter provided an option for the mud flaps - styrene or vinyl. I chose the former as the vinyl alternative in my example were deformed. The ERA blocks for the side skirts were of the 'minimal', rather than the 'full option' variety.  


Work on the turret can now commence. As with the T-64, the turret shell was completed first, together with the barrel for the co-axial machinegun. The right-hand side ERA bricks were tackled first. These consist of five pairs of blocks with separate bottoms (presumably to avoid sink marks) with a PE part in between so that the bricks be propped up at the proper angle. They are marked I to V and I found it easier if one worked backwards i.e. V to I. Because of my sloppy handling the wedges aren't really straight. The left-hand ERA wedges were less tedious as most of the were moulded as one and as most would be hidden and just for structural integrity, only the outermost and the middle PE spacers were put in place. The rest of the left cheek ERA bricks are still separate however but they went on easier. The barrel is a two-piece affair with hard-to clean seam lines. Also, like the T-64, there are two mantlet covers, this time I use the raised one. The boxes mounted on the snorkel were placed at roughly 45-degree angle as many photos show them in this position or fully horizontal and not vertical as in the kit instructions. Certain other items were left aside at this time to facilitate painting.

Painting and Decalling
To simplify things and also as a throwback to the Cold War days, my T-80BV was painted green overall. The Trumpeter instructions once again mislabelled 'Light Green' as 'XF-20' (which was Medium Grey). For the green, I used Vallejo Air 71.017 4BO Green. The tracks were painted Vallejo Anthracite Grey and washed with Tamiya XF-72 JGSDF Brown. The RPG skirting was painted Tamiya XF-85 Rubber Grey. Although many photos show the unditching log being painted the same colour as the vehicle, I painted it using wood-y colours using XF-55 Deck Tan as base and afterwards, XF-64 was drybrushed onto it. The mantlet cover and the spent case container were painted XF-49 Khaki. Decaling was very simple as there were only five pieces. Each of the split two-digit number on the right-hand side of the turret shared a single carrier film so it's best to cut the film to avoid it bridging the gap between the ERA bricks on which they are located.

Finishing
I started by adding the dust skirt on the lower front hull. Like the mud flaps, Trumpeter provided two types of the skirt and this time I chose the vinyl alternative. The braided copper wire was then cut to recommended length but then I realised that 110mm was too long - it was too late as the wire has already been superglued to the cable ends. The unditching log was then secured to its place, followed by the external fuel tanks.The rest of 'things around the turret' were then added and the joint scar retouched. The commander's cupola is a mini-kit and was assembled and painted separately with the basic cupola and the NSVT mount being cemented together before the rest of the assembly. One comment here: the commander's sight is solid plastic and I have to use gloss blue/black to simulate glass. The model was then given the usual wash treatment. The whole of the model was then given a thin coat of XF-57 Buff (double coating for the lower extremities). Afterwards a rather thin application of Vallejo Thick Mud was applied to the running gear and lower hull and was then washed with AK Interactive Earth Wash, finishing the build.

Conclusion
I had the old Dragon T-80BV (marketed as T-80 with ERA) years ago and comparing the experience of building the two kits, it goes without much dliberaration that the newer Trumpeter kit was hands down the winner. Sure, there is no such thing as a perfect kit but I have a way much better experience in building this kit. The only 'downside' (if one decides to call it) was the mass of parts needed to assemble (although not as bad as some other companies' or even Trumpeter's other kits), besides I cheated! One particular thing though - the suspension arm should be absolutely be made having a proper fit as it was quite tough to line them up straight and level. A bit more caution should also be exercised when assembling the right-hand side turret ERA blocks as they might not be symmetrical at the end of assembly. Otherwise the kit is very nice.