Showing posts with label jet interceptors. Show all posts
Showing posts with label jet interceptors. Show all posts

Wednesday, December 18, 2013

F - 106


F-106 Delta Dagger

Convair F-106 Delta Dart

First Flight:                          1956, December 26
Type:                                    Single-seat interceptor
Power:
                                             Pratt & Whitney P-17 turbojet engine
                                             11,113kg / 24,500lb after-burning thrust
Armament:
                                             M61A-1 20mm / 0.78 cannon (1)
                                             AIM-4Falcon AAM (4)
                                             AIR-2A Genie air-to-air nuclear missile – 1.5 kiloton warhead
Size:
                Length:                 21.55m / 70ft 8.75in
                Height:                 6.18m / 20ft 3.3in
                Wingspan:           11.67m / 38ft 2.5in
                Wing area:          64.8m2 / 697.8ft2
Weights:
                Empty:                  10,800kg / 23,814lb
                Normal:                16,012kg / 35,500lb
                Max Take-off:      17,350kg / 38,250lb
Performance:
                Max Speed:         2393kph / 1487mph / Mach 2.25 @ 40,000ft w/out tanks
                Ceiling:                 17,680m / 58,000ft - sustained
                Range:                  3138km / 1950 miles – external tanks
                                              1850km / 1150 miles – internal fuel
                Climb:                   9144m / 30,000ft per minute
                                              17,374m / 57,000ft – 4.5 minutes
Production:
                F-106A:                277
                F-106B:                  63 (two-seat)

Indented fuselage over wing aided streamlining

The nuclear weapon that destroyed Hiroshima had the blast equivalent of 14,000 tons of TNT.  A nuclear weapon targeting a city during the Cold War would likely be over 70 times that powerful.  These thermonuclear weapons were measured in megatons, or increments of a blast equaling 1,000,000 tons of TNT.  A one megaton explosion would create a blast of heat that would instantly ignite fabric and paper six miles from the detonation.  The old ‘Duck and Cover’ drills practiced by school kids in the 50s had the benefit of giving people a false sense of hope.  In reality, the few survivors there were of such a blast would likely hope death would relieve them of their misery. 

Genie missile capable of carrying nuclear warhead

When the F-106 was being developed during the 1950s both the Soviet Union and the United States were limited to the use of strategic bombers for delivering their nuclear devastation on an opposing city.  Assessing the Soviet inventory U.S. military planners most feared the Tupolev Tu-95 ‘Bear’.  It was capable of flying long distances at very high altitudes.  Its likely path of attack was over the Arctic Circle from a base somewhere in northeast Siberia.  A network of very large radar installations, known as the DEW Line (Distant Early Warning) was set up to meet this threat.  Likewise a number of jet interceptors were designed during this period with the exclusive purpose of intercepting these Russian bombers before they could reach their North American targets.  Among these aircraft were the F-89 Scorpion, the F-94 Starfire and the F-102 Delta Dagger.  None of them adequately met the requirements of the Air Force’s Air Defense Command.  The United States Air Force wanted an aircraft capable of flying Mach 2, twice the speed of sound, and be able to reliably destroy an enemy bomber even if it were flying well above 50,000 feet. 

Tupolev Tu-95 'Bear' - best Russian strategic bomber

 The initial flights of the prototype F-106 in late 1956 were disappointing.  There naturally was some grumbling about scrapping the program but the plane showed potential.  Its avionics were absolutely revolutionary if only they could make it work.  An aircraft promising a technological leap in aviation is going to take time to properly develop.  No one should really be surprised that the F-106 would not become operational for another three years.  When the F-106 Delta Dart, or simply Six as it was referred to by its pilots, went into service with the Air Force in 1959 it could already go twice the speed of its predecessor the F-102.  The instrumentation featured a Tactical Information Display that graphically summarized the current situation by pointing out where you were, where your target was in relation to you as well as other contemporary information relevant to the pilot’s mission.  The F-106 had infrared target acquisition technology to back up its radar-based, Hughes MA-1 fire control system.  It took Hughes Aircraft years to get this setup right but it was worth the wait.  The cutting-edge avionics were computerized, digitized and data-linked with those manning the powerful radars on the ground.  If you were part of this system put together by ADC (Air Defense Command) you had to feel any enemy bomber formation coming over the Arctic horizon was doomed.  Your feeling of security and well-being was short-lived.

New air intakes for powerful and thirsty jet engine

Within a couple of years both the United States and Soviet Union were bringing on line a new technology that made the Buck Rogers cockpit of the F-106 irrelevant.  There simply was no defensive response to the launch of a nuclear tipped Intercontinental Ballistic Missile.  You make your peace with God and comfortably sit in your favorite easy chair waiting to be vaporized.  Around the time of the Cuban Missile Crisis some entrepreneurial types offered to sell their neighbors bomb shelters for the back yard.  When it wasn’t being used on doomsday it made for a great family rec room.  Such were the unintended benefits of the Cold War. 

F-106 - pilots simply referred to it as Six

The F-106 was an impressive aircraft.  It even displayed remarkable dogfighting characteristics although that never was its designers’ intent.  It remained on duty as this nation’s primary defense against air attack well into the 1970s, shadowing curious Tupolev ‘Bears’ snooping off the coast of Alaska and keeping Soviet aircraft an honest distance from the American east coast while on their way to Cuba.  It was clear the threat of nuclear annihilation now came from giant land-based ballistic missiles and from missiles launched from submerged submarines hidden somewhere in the vast spaces of ocean.  Still, so long as there were bombers capable of flying thousands of miles there would continue to be someone on patrol in a cockpit ready to respond.

America's original seven astronauts pose by F-106

Monday, December 16, 2013

MiG 19


MiG 19 - NATO code name:  Farmer

Mikoyan-Gurevich MiG – 19

First flight:                   1953, September 18
Type:                           single-seat day twin-engine fighter-bomber
Power:                        
                                    Tumansky RD-9B turbojets (2)
                                    2549kg / 5730lb thrust
                                    3300kg / 7275lb afterburning
Armament:
                                    30mm / 1.18in cannon NR-30 (3)
                                                Wing root – 2
                                                Nose - 1
                                    500kg / 1102lb weapons under the wings
Size:
            Length:            12.6m / 41ft 4in
            Height:              3.88m / 12ft 8.75in
Wing:
Wingspan:       9.2m / 30ft 2.25in
Wing Area:      25m2 / 269.11ft2
Aspect Ratio:   3.24
Wing Sweep:   55o
Tailplane:         5m / 16ft 4.75in
Weights:
            Empty:             5760kg / 12,699lb
            Normal:            7545kg / 16,634lb
            Max take-off:   9100kg / 20,062lb
Fuel:
            Internal:            1687kg / 3719lb
            External:          1140kg / 1608lb with 2 drop tanks
Performance:
            Max speed:     1450kph / 901mph
            Cruise speed:  950kph / 590mph
            Ceiling:            17,900m / 58,725ft
            Range:             2200km / 1367 miles with drop tanks
            Climb:              6900m / 22,640ft per minute

MiG 19: split air intake; wing fence for streamlining

When you have several powerful nations crunched up in the small space that is Europe bad things are bound to happen.  It’s been that way for hundreds of years.  Joe Stalin knew something about the dynamics of power between nations.  Stalin was a realist.  There are no friendships among the community of nations.  There are only shared interests and conflicts of interests.  Diplomacy is the preferred means of settling issues of dispute but history has proved the value of a powerful military no matter the approach leaders choose to make.  When another nation wants something you consider to be yours appeals to morality are a poor second to the threat of a strong military presence and the will to use devastating force. 

Armed with 3 30mm cannon; armament on wings

The United States and the Soviet Union had a brief alliance because they shared the need to destroy Nazi Germany.  Once that issue was settled the suppressed conflicts of interest between the two nations quickly re-emerged and the gloves came off.  Both nations soon found themselves in a race to develop weapons of technical superiority over the other.  At the very least neither nation wanted to concede a military advantage to the other, if at all possible.  This was dramatically demonstrated in the rapid deployment new combat aircraft during the early years of the Cold War.

Air-to-Air missiles mounted under wings

Development of the Soviet MiG-19 reflected the urgency that also motivated America’s bringing to operational status jets such as the F-80 Shooting Star and the F7U Cutlass.  Early models were prone to accident because the engineering had not been thoroughly worked out.  You took a big risk piloting a jet on the bleeding edge of technology.  It’s a good reason why patriots of both countries honored these anonymous men in uniform.

F-6 with brakechute:  Chinese version of MiG 19

The first MiG-19s put into service had to be withdrawn because of a series of crashes due to stability problems.  The MiG-19 may have taken on the role of a fighter-bomber but it was clearly meant to be an interceptor.  It was a screaming dart of a jet with two engines equipped with afterburners, an astounding swept-wing of 55 degrees and performance that could best most any contemporary jet in a dogfight.  Is it any wonder this aircraft would quickly dive itself into the ground on the slimmest pretext of pilot error?  It’s clear the tailplane absolutely had to become a single movable piece but other adjustments probably had to do with allowing mere mortals to fly the aircraft without killing themselves.  They could have benefited from the kind of on-board computers we have today that keep inherently unstable jets, like the B-2 bomber, airborne.  

Arab nations among foreign buyers of MiG 19, F-6

The MiG-19 was a killing beast.  Imagine what three 30mm cannon would do to your airframe if you got lit up in the MiG’s crosshairs?  Sure, the cannon range might have been longer and their rate of fire wasn’t blistering but how many rounds this size does it take to shred your means of staying airborne?  May, 1972 over North Vietnam:  7 American F-4 Phantoms are shot down by the Chinese version of the MiG-19.  Of course the American Phantoms knocked 10 of these MiGs out of the sky but the MiG-19 was designed in the 1950s.  It’s obsolete.  What gives?  Here’s something to think about.  The Israeli’s claimed to have shot down several MiG-19s without a single loss of their own during the Six Day War in 1967.  Here’s the difference in results between 1967 and five years later over Vietnam.  Israeli pilots were trained to dogfight.  American pilots were taught to fly jets.  The Phantoms that first appeared over the skies of Hanoi had no guns.  It was all about the technology.  Simply lock your radar on an enemy bogie and fire your missile.  Wrong – we weren't quite in the push-button age of The Jetsons, yet.  Guns still mattered and so did the skill of the pilot in the cockpit.  That was just one of the many painful lessons leaders in the U.S. hopefully learned from their experience in Vietnam.

A-10 exhibits ground support design unlike MiG 19

Let’s sum it up.  The engineers at Mikoyan-Gurevich came up with a damn good fighter – fast, reliable and effective.  It out-performed the F-100 Super Sabre, its American equivalent.  It lacked combat radius so let’s not think of it as a true fighter-bomber.  You need to get somewhere and you also need fuel enough to have time over the target if you’re serious about a ground support mission.  Supersonic speed is of no use if all you want to do is land a bomb accurately on someone’s head.  You want ground-support?  Is there any plane better at what it does than the American A-10 Warthog?  The problem is the Air Force is always looking for reasons to ground this plane forever.  Backing up grunts on the ground isn't sexy enough for the strategically minded big brass.  If you’re serious about wowing the ladies don’t drop a turd in the punchbowl and don’t tell them you fly a Warthog.

F-100 was no match for MiG 19 in dogfight performance

MiG 19 reveals twin-engine configuration

Friday, December 13, 2013

F-102 Delta Dagger


F-102A Delta Dagger

Convair F-102 Delta Dagger / ‘Deuce’

First Flight:                          1953, October 24
Type:                                     Single-seat interceptor
Power:
                                                Pratt & Whitney J57P-23 turbojet
                                                5307kg / 11,700lb thrust
                                                7802kg / 17,200lb afterburning thrust
Armament:
                                                AIM-4C Falcon infra-red homing air-to-air missiles (3)
                                                AIM-26A Nuclear Falcon
                                                Or
                                                AIM-4A semi-active radar homing (3)
                                                AIM-4C Falcon infra-red air-to-air missiles (3)
Weapons System:
                                                Hughes MG-10 fire-control system
                                                Track several targets simultaneously – 50km / 31 miles
                                                Lock-on individual aircraft – 25km / 16 miles
                                                Internal weapons bay holds all armament to reduce drag
Size:
                Wingspan:           11.62m / 38ft 1.5 in
                Length:                 20.84m / 68ft 5in
                Height:                 6.46m / 21ft 2.5in
                Wing Area:          61.45m2 / 661.5ft2
Weights:
                Empty:                  8630kg / 19,050lb
                Load, normal:    12,565kg / 27,700lb
                Max Take-off:   14,288kg / 31,500lb
Performance:
                Max speed:        1328kph / 825mph
                            Cruise:    869kph / 540mph @ 10,670m / 35,000ft
                Ceiling:              16,460m / 54,000ft
                Range:                2173km / 1350 miles – max
                                             1610km / 1000 miles – 2 drop tanks / full armament
                            Fuel:      4107 liters / 1,085 gallons – internal, max
                                           5735 liters / 1,515 gallons – drop tanks, 2
                Climb:                5304m / 17,400ft per minute
Production:                        875 aircraft delivered to the US Air Force

YF-102 pre-production model

The early interceptors used by the US Air Force lacked the necessary speed and climb rate to intercept enemy bombers far from their intended target.  The jets coming off the drawing board following World War II were designed to be fighters, able to maneuver in dogfights, although these first efforts like the F-80, F-84 and F-94 were disappointing in this ability.  They also lacked thrust and swept-wing aerodynamics. 

F-102 shadows Tu-95 Bear

An interceptor doesn’t need dogfighting ability to defeat bombers.  It just needs speed and lots of it.  It also needs to pack a knockout punch that will quickly dispatch a bomber from the sky.  What the Air Force wanted for this role was an airborne weapons system that could fly faster than the speed of sound at level flight.  Using gravity in a dive to break the sound barrier was cheating.  The winning design was for a jet that would eventually come to be known as the F-106 Delta Dart.  It was a very ambitious project and it was soon apparent that development would take too long to meet the current threat posed by Soviet strategic bombers.  The Air Force agreed to produce an interim solution that would become the F-102 Delta Dagger, or ‘Deuce’ as it was called by its pilots. 

Early F-102s fired unguided Mighty Mouse missiles

The F-102 benefitted from a research plane developed by Convair in 1948.  This was the XF-92.  It was specifically designed to test research Germany had done on developing a delta wing jet during World War Two.  The knowledge gained from flying the XF-92 contributed considerably to the design of the F-102.  Still, there were unanticipated problems.  Despite a powerful jet engine the F-102 was not able to attain supersonic speed at level flight – a basic requirement.  The problem was the aircraft wasn’t slippery enough in cutting through the atmosphere.  It had an unexpected problem with drag.  Transonic speed, or going faster than sound, required the fuselage to be redesigned so that it was narrower over the wings and wider on the ends.  This became known as the “area rule” and it resulted in a fuselage that vaguely resembled the shape of a Coke bottle.

All armament was within an internal weapons bay

The exotic fire control system developed by Hughes also delayed the jet’s delivery date.  Besides having an airborne radar system capable of tracking multiple targets simultaneously, it introduced an on-board computer to fighter-sized jets and it provided a datalink system synchronized with the ground-control radar operator.  It was a fine package but it proved to be a difficult birth and when the F-102 finally went into service with the Air Force in 1956 it was three years late. 

XF-92 had a nose air intake

Captured German war designs benefited the XF-92

Better late than never.  The F-102 performed admirably and at its peak it was flown by 26 squadrons of the US Air Defense Command.  It was more than an interim solution.  It was a world-class interceptor in its own right and it made a significant contribution to the history of Cold War aviation.

Tail bulge, or Marilyns, enabled supersonic flight

Thursday, December 12, 2013

F - 94


F-94C Starfire with mid-wing rocket pods

Lockheed F-94C Starfire

First Flight:          1949, April 16 (YF-94)
Type:                     two-seat all-weather interceptor
Power:
                              Pratt & Whitney J48-P-5 turbojet engine
                              License-built version of Rolls-Royce Tay turbojet
                              3969kg / 8750lb afterburning thrust
Armament:
                            69.85mm / 2.75in Mighty Mouse air-to-air rocket projectiles (24) / nose
                            Mid-wing launcher pods with Mighty Mouse unguided rockets (12 + 12)
Size:
                Wingspan:           12.93m / 42ft 5in
                Length:                 13.56m / 44ft 6in
                Height:                 4.55m / 14ft 11in
                Wing Area:          31.4m2 / 338ft2
Weight:
                Empty:                  5761kg / 12,700ft
                Loaded:               8301kg / 18,300lb
                Max. Take-off:    10,977kg / 24,200lb
Performance:
                Max. Speed:      941kph / 585mph
                                            1030kph / 640mph @ sea level
                Cruise Speed:    793kph / 493mph
                Ceiling:               15,665m / 51,400ft
                Range:                 
        1930km / 1200 miles – maximum
        1295km / 805 miles – normal
                Climb:                 2430m / 7980ft per minute
Production:                        853 F-94s (models A, B, C)

F-94 featured in comic strip Terry and the Pirates

The detonation of an atomic bomb by the Soviet Union in 1949 and the fear by American leaders of a Soviet bomber threat pushed the United States into an urgent program to develop an all-weather jet interceptor.   This sense of vulnerability created a rush to convert the T-33 jet trainer into a jet equipped with a first-of-its-kind radar fire control system.  These first versions of the F-94 were considered to be interim solutions at best.  Because the T-33 was a converted F-80 Shooting Star, it passed along the deficiencies of this early jet fighter to the new Air Force interceptor.  Foremost among these problems was the lack of fuel capacity which severely limited the F-94’s range.  While the thrust of the new jet and its armament would be improved over time there was never a remedy for its inherent design weakness that required nearly all of its fuel to be stored in the wing and wingtip tanks.

Unguided Mighty Mouse rockets use shot-gun effect

The introduction of the MiG 15 into the Korean War in late 1951 and its success in downing B-29s was the main reason for introducing the F-94 into that conflict.  Unfortunately the presence of the F-94 had little effect on MiG operations because Air Force policy forbid the plane be used over Communist controlled territory.  This decision was made to prevent the plane’s secret airborne radar technology from falling into enemy hands.  This is an understandable concern but, unfortunately, this revolutionary weapons control system was highly unreliable and very limited in its effectiveness in directing attacks against enemy planes.  Many of the F-94 missions involved using their technology in night operations to intercept hostile aircraft operating over friendly territory.  These consisted largely of preventing obsolete propeller planes from launching ‘Bedcheck Charlie’ nuisance attacks on allied air bases. 

Snap-hinge doors contain Mighty Mouse rockets

The F-94 will be best remembered for contributing to the air defense of the North American continent between 1949 and 1953.  In 1953 development of the aircraft had matured into its final form as the F-94C Starfire.  The aircraft had substantial greater thrust and its armament had been significantly upgraded from four .50 caliber machine guns in the nose to being able to launch a flurry of 24 missiles at its target.  Development had taken two years longer than hoped for primarily due to the difficulty in perfecting the jet’s new fire control system.  One of the difficulties involved launching rockets near the plane’s radome in the nose which had a tendency to cause an engine flameout.  As it turns out the F-94C had limited service as a front line interceptor as it was soon replaced by the F-89 Scorpion and the supersonic F-86D Sabre. 

F-94 deployed drag chute for landing

These initial combat jets were designed under the time constraints of facing imminent threats generated by tensions of the early Cold War.  Pilots on the frontline were Beta testing aircraft often rushed to the field.  Everyone, engineers and pilots alike, was discovering through personal experience what this new jet technology was all about.  If you were a combat pilot over Korea during these years you are eating, drinking and sleeping this stuff or taking on a far greater risk of an early death headed nose first towards the ground.

Click picture for video of rocket firing