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Found 8 results

  1. Preface: The main purpose of this post is not to strictly improve the missile performance itself, but to correct values in the AIM-7 missile Lua code that are not accurate to the publicly available information. Any improvement to the performance of the missile should be seen as a side effect and not the intended purpose. This post seeks to compare several public sources on the AIM-7's Hercules MK-58 rocket motor to what is actually modeled in game, and contrast them accordingly. Tests were done using a modified AIM-7F utilizing the "corrected" values to showcase the differences to the vanilla missile. Only the AIM-7F was used for testing as the kinematics between each variant carrying the MK-58 rocket motor are practically negligible. The Tacview files will be provided in this post. The ED AIM-7 vs Public Data: 1. Rocket Motor Burn Time According to ED's missile code (Fig. 1), the AIM-7 has a booster stage burn time of 3.7 seconds, and a sustainer burn time of 10.8 seconds for a total run time of 14.5 seconds not including the 0.2 second delay for the boost ignition and 0.2 second delay for the sustainer ignition. However, according to the "Raytheon AIM-7F Standard Missile Characteristics" data sheet (Fig.2), "AD-A-142508" (Fig.3) and "Gallery of USAF Weapons, 2010 Almanac" (Fig. 4) the stated burn time for the boost stage is 4.5 seconds and the sustainer stage is 11 seconds for a total run time of 15.5 seconds. This is one full second, not including ignition delays, of difference between the ED code and public information. This may be a negligible difference, but there is a conversation about edge cases where the one extra second may matter. Figure 1: Default Eagle Dynamics AIM-7 MK-58 motor code Figure 2: Raytheon AIM-7F Standard Missile Characteristics Engine Ratings Figure 3: AD-A-142508 AIM-7F data sheet Figure 4: Gallery of USAF Weapons, 2010 Almanac AIM-7 data sheet 2. Boost and Sustain Fuel Mass and Mass Ratios Looking at the ED code (Fig.5) boost stage for the MK-58 has a fuel mass of 38.48kg (84.83lbs), and the sustainer stage has 21.82kg (48.10lbs) of propellent for a total mass of 60.3kg (132.9lbs). The sustainer-to-booster propellent mass ratio is approximately 63/37. However, comparing this to the Raytheon propellent masses (Fig. 6) the boost phase contains 52.0lbs (23.6kgs) of propellent and the sustainer fuel mass is 83.0lbs (37.6kg) for a total of 135.0lbs (61.2kgs). The sustainer-to-booster propellent mass ratio with this information is approximately 39/61. The actual masses of propellent in each stage are practically the same with only an error of 7.5%(smaller mass) and 2.3%(larger mass), but reversed in ratio. According to a Canadian study of the Mk-58 Mod 5 rocket motor, there are no listed measurements for the individual propellent masses except for a total fuel mass of 61kg (134lbs). However, the stated sustainer-to-booster propellent mass ratio is 70/30 (Fig. 7) which leads to a booster fuel mass of roughly 18.3kg (40.3lbs), and a sustainer fuel mass of roughly 42.7kg (94.1lbs). Neglecting that the Mod 5 version of the motor may have slightly different masses for each stage, the point stands that the ED MK-58 is coded to have a complete reversal of the publicly available data on the propellent mass and mass ratios for each stage. This will lead to noticeable differences in the performance of each stage as we will see in the test portion of this post. Figure 5: ED AIM-7 fuel mass code Figure 6: Raytheon AIM-7 SMC Fuel data Figure 7: Canadian MK-58 study 3. Boost and Sustain Specific Impulse Values As stated in the ED AIM-7 code (Fig. 8.), the specific impulse for the boost phase of the MK-58 motor is 247 seconds, and 209 seconds for the sustainer phase. Using the ED values, and a gravity value of 9.8 m/s2, we get a boost phase thrust of approximately 25.174kN (5659lbf), and a sustainer phase thrust of approximately 4.138kN (930lbf). Now, according to both the Raytheon AIM-7 SMC (Fig. 2) and the AD-A-142508 (Fig. 3), the stated thrust of the boost phase is 5750lbf (25.577kN), and 1018lbf (4.528kN) for the sustainer. Note that the ED values are underperforming, but can be considered negligible as there is only an error of about 1.6% and 8.6% and motor performance varies with many factors. Using the ED values for both thrust and fuel mass, but correcting the fuel ratios and burn time for each stage, we get a boost phase specific impulse of 530 seconds and sustainer phase of 121 seconds. This is quite a dramatic difference in performance between the actual ED missile and this theoretical "corrected" motor with the boost phase being over twice as efficient, but the sustainer being nearly half as efficient. Now, this may seem as though the performance of the missile may also dramatically improve, but, as we will see in the tests, this is not the case. This is a minimum however as the ED missile uses a lower thrust and fuel mass compared to the public data, so there may be performance left on the table. If we use only public data to formulate the specific impulse of each stage then we get a boost phase of 498 seconds and a sustainer phase of 135 seconds. We will see how this version of the missile compares to the ED one as will. Figure 8: ED AIM-7 specific impulse code In-Game AIM-7F Tests: Test Parameters: Game Version: 2.9.1.48335 Map: Marianas Weather, Date, Time: Mission Editor defaults Launch Platform: F-15C Launch Altitude: ~40,000ft Launch Speed: ~1.5 IMN Target Platform: MiG-19P Target Altitude: ~40,000ft Target Speed: ~1.2 IMN Test 1: Control: Test 2: Corrected Burn Times: Test 3: Corrected Burn Time, ED Fuel Mass, Corrected Ratio: Test 4: Corrected Burn Time, ED Fuel Mass, Corrected Ratio, and Specific Impulse: Test 5: AIM-7F Public Data Only: Conclusions: First, comparing the control missile to the missile from Test 2, we see that the change in burn time yields practically zero difference in peak energy states. However, it can be said that the extra time in the boost phase and overall longer burn time will help in edge cases where a slightly longer burn time would result in better terminal energy. Looking at Test 3, we see that the acceleration observed at each stage is dramatically different where the majority of the acceleration of the missile is felt during the sustain phase rather than the boost phase, and the overall acceleration of the missile is much smoother reminiscent of the AIM-54's motor. Yet, again, the missile does not yield any noticeable improvement to peak energy state, but it can be said that this could perhaps drastically improve the performance of the AIM-7MH and P missiles as the loft maneuver is less than optimal which depletes the effectiveness of the MK-58's boost stage. This is just speculation though. Next, we see that in Test 4 we finally yield some peak energy improvements however small. It is worth noting that the energy graph has now returned to shape of the vanilla missile with the boost phase taking the brunt of the acceleration leg work. Although the gains are small, this would still result in a better missile with the extended burn time and slightly higher peak energy state, however marginal. Finally, we arrive at Test 5 using only public data. This missile yields the best peak energy state gaining as much energy over Test 4 as Test 4 gains over Test 1. Again, the energy graph is practically a replica of the vanilla one in terms of shape. Although the specific impulse of the boost phase is lower than that of Test 4 the sustainer is higher, and this results in the higher energy state as Test 5 would have higher actual thrust values compared to the ED numbers. It is important to note that Test 4 and 5, where the sustainer specific impulses are lower than the vanilla, would indicate that overall performance may be worse against a maneuvering target, but, again, this is just speculation since the test was done against a cooperative target. Overall, ED has done a fair job at replicating the AIM-7's MK-58 motor performance using "incorrect" fuel ratios and specific impulses, but it is unfortunate that it has been done with "incorrect" information. I believe that the closer we can get to real values (as long as they are public, of course) the better the simulation will be. References: 1. Raytheon AIM-7F Standard Missile Characteristics: http://aviationarchives.blogspot.com/2016/08/raytheon-aim-7f-standard-missile.html 2. Gallery of USAF Weapons, 2010 Almanac: https://www.airandspaceforces.com/PDF/MagazineArchive/Magazine Documents/2010/May 2010/0510weapons.pdf 3. AD-A-142508: https://apps.dtic.mil/sti/pdfs/ADA142508.pdf 4. Canadian MK-58 Mod 5 study: https://apps.dtic.mil/sti/pdfs/ADA596430.pdf AIM-7F Corrected Burntime.acmi AIM-7F Vanilla.acmi AIM-7F Public Data Only.acmi AIM-7F Corrected Burntime+Fuel Mass+Impulse.acmi AIM-7F Corrected Burntime+Fuel Mass.acmi
  2. [Potential] Issue: When flying with AIM-7 sparrow loaded and selected as the current weapon, and HARM on board, the CAGE/UNCAGE button no longer toggles the NORM/LOFT mode of the AIM-7 Sparrow while in A/A mode, unless the HARM is manually set to PB via HARM DISPLAY. Wondering if this may be related to HARM OVERRIDE. Reason being, HARM OVERRIDE is unboxed (allowing HARM take-over) when in A/A mode and it cannot be re-boxed. Returning to the DDI menu and selecting HARM DISPLAY, and then changing the HARM to PB mode (thereby not leaving A/A mode) returns function of the CAGE/UNCAGE button to toggle Sparrow NORM/LOFT. Conditions: Aim-7 Sparrow as current weapon A/A Master Mode HARM loaded on any pylon HARM set either SP or TOO mode via HARM DISPLAY (remain in A/A mode) Supporting Files: Track attached Mission file attached FA18C_Sparrow_LOFT_Toggle_Bug.miz Hornet_Sparrow_LOFT_Toggle_HARM.trk
  3. WELCOME TO TIGER MEET 2021 Mission Start time: 15:30 Location; Sirya 1980 TIGER MEET is a dynamic capture bases online campaign PVP. SRS radio-SRS will connect automatically when entering a slot LOTAC is available two slots per side Multiplayer Server: ==2RGT==|Tiger Meet 80S|PvP|Syria|Cold War|Persistent Discord : https://discord.gg/zBzfMckyDX Site: https://vsroberst.wixsite.com/2rgt SERVER IP: 87.19.168.37:10308 HELLO EVERYONE, this sirver it's same mission of Dinamyc TIGER MEET MODERN. The importat difference, it's change limit of weapons 80s era so there are only weapons used in the same age. Another we addon 2 FARP aveable for MI-24P RED SHAYRAT BLUE NAQOURA DETAILS AS FOLLOW: EACH PILOT HAS 4 LIVES FOR SERVER SESSION. SERVER SESSION TIME IS 4 HOURS. EVERY 4 HOURS THE MISSION PROGRESS WILL BE SAVED AND THE SERVER WILL RESTART AND ALL LIVES WILL BE RESTORED. DURING A SESSION IF YOU EJECT IT IS POSSIBLE TO RECOVER YOUR LIFE THROUGH THE RESCUE HELICOPTERS. (CSAR). IF YOU LOST ALL YOUR LIVES YOU CAN CONTINUE FLY WITH F5 (BLUE ) AND MIG21 (RED) AND HELICOPTERS. INFINITE LIVES WITH THESE MODELS. TO WIN YOU HAVE TO CONQUER ALL ENEMY BASES, FARP AND DESTROY ALL ENEMY DEFENSES. (see below details for red and blue bases/farp) AT MISSION START THERE ARE 4 AIRPORTS AND 1 FARP PER FACTION: RED AIRPORTS (DAMASCO, AIR COLLEGE, HAIFA, RAMAT DAVID) AND 1 FARP (ON BS28 BERBURY) BLUE AIRPORTS (BEIRUT, RENE, PALMYRA, AL QUASAYR) AND 1 FARP (ON BU39 AIR DEFENCE) THERE ARE 3 NEUTRAL AIRPORT ( ON YB47 KIRIAT SHAMONA, ON BT25 RAYAK, ON CT05 NASIRYAH) AND 3 NEUTRAL FARP (ON BS31 WESTERN GARYAH, ON YB30 BEITH SHEAN, ON CU51 DESERT FARP) THERE IS THE POSSIBLITY TO CONQUER THEM FOR STRATEGIC SUPPORT. WITH HELICOPTERS YOU CAN BRING THERE TROOPS TO TAKE THE BASE. ONCE CONQUERED YOU CAN BUILD CRATES FOR DEFENCES AND FOBS TO TAKE TROOPS HELICOPTERS HAVE THE POSSIBILITY OF CTLD (FOR TRANSPORT TROOPS / BUILD CRATES) IN EVERY FACTION BASE AND EVERY NEUTRAL CONQUERED AIRPORT/FARP. THE MIX WILL ALREADY HAVE ONE AWACS PER FACTION FLYING WITH THE POSSIBLILITY TO REQUEST 2 MORE WHEN NECESSARY (FROM COM MENU) ALSO YOU CAN REQUEST TAKER FOR AIR REFUEL (FROM COM MENU) ALL DETAILS HERE AND IN THE BRIEFING PAGE. DETAILS :RED-BLUE ------------------------------------------- ------------------------------------------- AIRPORT RED AT START: -DAMASCO -RAMAT DAVID -AIR COLLEGE -HAIFA FARP RED AT START: -ON BS28 (BERBURY) AWACS 245.00 EWR 124.00 TANKER 28X 263.00 ARCO-TEXACO-SHELL CARRIER GROUP TCN 5X : -CVN 75 ICLS 1 BRC 110° -CVN 74 ICLS 2 BRC 110° -LHA1 ICLS 3 BRC 110° AIRPORT BLU AT START -BEIRUT -RENE -PALMYRA -AL QUASAYR FARP BLU AT START -ON BU39 (AIR DEFENCE) AWACS : 251.00 EWR 258.00 TANKER: 26X TCN 235.00 ARCO-TEXACO-SHELL CARRIER GROUP TCN 7X : -CVN 73 ICLS 1 BRC 110° -CVN 74 ICLS 2 BRC 110° -LHA1 ICLS 3 BRC 110° FARP NEUTRAL -ON BS31 (WESTERN GARYAH) -ON YB30 (BEITH SHEAN) -ON CU51 (DESERT FARP) AIRPORT NEUTRAL -ON YB47 (KIRIAT SHAMONA) -ON BT25 (RAYAK) -ON CT05 (NASIRYAH) ------------------------------------------- AIRCRAFT AVAILABLE RED: AIRCRAFT AVAILABLE BLUE: -F.14a IRAN -F.14A USA -F.16 GREECE -F.16 USA -MIG.21 RUSSIAN -F.5 ITALIA -MIRAGE.2000 FRANCE -VIGGEN SWEDEN -JF.17 PAKISTAN -F.18 SWITZERLAND -A10C USAF AGGRESSOR -A10C-USA -HARRIER ROYAL NAVY -HARRIER ITALY ELICOPTER RED ELICOPTER BLUE -UH.1H FRANCE -UH.1H USA -KA.50 RUSSIAN -KA.50 GEORGIAN -MI.8 IRAN -MI.8 GERMANY ---------------------------------------------- SITUATION RED: RED FACTION HAVE 4 AIRPORTS (DAMASCO, AIR COLLEGE, HAIFA, RAMAT DAVID) AND 1 FARP (ON BS28 BERBURY) OUR OBJECTIVE IS TO DEFEND OUR SITES AND ATTACK RED SIDE ON THEIR AIRDROMES/FARP. ALL AIRBASES ARE DEFENDED FROM SAM SITES THERE IS ONE AWACS IN FLIGHT AND WE CAN CALL ANOTHER TWO SHIP AND GCI CAN MOVE IT THERE IS NO TANKER IN FLIGHT BUT YOU CAN CALL THREE SHIP AND GCI CAN MOVE IT NAVAL BATTLE GROUP consists 1 CARRIER CVN73 (BEHIND CARRIER THERE ARE TWO SHIP 1NM - 2NM, ON LEFT CIRCUIT THERE IS A ONE TRANSPORT AT 1NM) 1 CARRIER CVN74 1 CARRIER TRAWA 1 SUBMARINE 1 TRANSPORT 3 DESTROYER 2 FRIGATE -KA.50 RUSSIAN -MI.8 IRAN -------------------------------------------- SITUATION BLUE: BLUE FACTION HAVE 4 AIRPORTS (BEIRUT, RENE, PALMYRA, AL QUASAYR) AND 1 FARP (ON BU39 AIR DEFENCE) OUR OBJECTIVE IS TO DEFEND OUR SITES AND ATTACK RED SIDE ON THEIR AIRDROMES/FARP. ALL AIRBASES ARE DEFENDED FROM SAM SITES THERE IS ONE AWACS IN FLIGHT AND WE CAN CALL ANOTHER TWO SHIP AND GCI CAN MOVE IT THERE IS NO TANKER IN FLIGHT BUT YOU CAN CALL THREE SHIP AND GCI CAN MOVE IT NAVAL BATTLE GROUP consists 1 CARRIER CVN73 (BEHIND CARRIER THERE ARE TWO SHIP 1NM - 2NM, ON LEFT CIRCUIT THERE IS A ONE TRANSPORT AT 1NM) 1 CARRIER CVN74 1 CARRIER TRAWA 1 SUBMARINE 1 TRANSPORT 3 ARLEIGH BURKE 2 PERRY -KA.50 GEORGIAN -MI.8 GERMANY
  4. I know there's already a thread talking about this Tomcast episode, but I'm not here to talk about the AIM-54 Phoenix. I had one specific thing come to my attention when watching the video and it was a short question from Bio to Wahoo about whether or not the AWG-9 had a TTI counter yet. This question came when Wahoo was talking about an AIM-7F shoot against a TALOS cruise missile in 1979. Wahoo said they did not have TTIs just yet(or that he was unsure), but BIO did. The question is asked at at almost 51:00 exactly (video linked starts at 50:48). So, I'm wondering if we can get, or ever will get, a TTI counter for the AIM-7 Sparrow. I know the AIM-54 already has one, but I don't see as to why the Sparrow wouldn't have one given that the Phoenix still gets one when fired in semi-active. I know it's a bit of anecdotal evidence, but I don't really have a better source other than two legitimate F-14 RIOs talking about it.
  5. FLOOD mode button missing when AIM-7 fired on L&S designated target -> automatic STT lock. FLOOD mode cant be selected on DDI. FLOOD mode button only able to select if AIM-7 fired on STT target. Second part of bug: - In many ocasions, FLOOD mode not guiding missile after selected on DDI or if second AIM-7 fired when radar already in FLOOD mode from previous AIM-7 launch. AIM-7_FLOOD_BUG.trk
  6. AI aircraft are still refusing to utilize BVR missiles for me as of 5-20-2022. Set up a Mig-29S and F/A-18C to test the new BVR AI; they fail to employ AIM-120C, AIM-120B, AIM-7, R-77, and R-27R(tested them all). Instead, they close to the merge and then use their AIM-9X or R-73 missiles. Track file is attached, thanks in advance. 5-20-2022_2147.trk
  7. Would be great if someone can make this happen even with current avionics and symbology in current Viper, Yeah i know it is far from reality but still can be used in coldwar scenarios with sparrow limitation
  8. Hello all! The AIM-7 Sparrow (Airbourne Interception Missile) is a radar guided air to air missile, it used alongside the famous AIM-9 sidewinder and also infuenced aerial combat quite alot. it was the forefront of todays BVR combat. In the begining and a brief explaination of how the AIM-7 works unlike the AIM-9 sidewinder, the AIM-7 uses radiowaves to guide to its target, im going to explain how its done: The Sparrow Evolution and Performance Thanks to MacedonianSukhoi for the image. -------------------------------------------------------------------------------------------------------------------------- AIM-7A - Sparrow I The history of the Sparrow missile dates back to 1947, when the U.S. Navy contracted Sperry to develop a beam-riding guidance system for a standard 12.7 cm (5 in) HVAR (High Velocity Aerial Rocket). The original designation for this missile project was KAS-1, but this was changed to AAM-2 in September 1947 and to AAM-N-2 in early 1948. The 5" diameter soon proved to be too small, so Douglas developed a new airframe of 20.3 cm (8 in) diameter. The first unpowered flight tests of XAAM-N-2 prototypes occurred in 1948. Development was difficult, however, and the first successful air-to-air interception was only done in December 1952. The AAM-N-2 Sparrow I entered service in 1956 with F3H-2M Demon and F7U-3M Cutlass fighters. Because of the inherent disadvantages of beam-riding guidance, like poor low-level performance, only 2000 Sparrow I missiles were produced, and it was withdrawn from service after only a few years. Another drawback of the AAM-N-2 was that the guidance beam was slaved to an optical sight in the aircraft, which necessitated visual identification of the target, making the Sparrow I a short-range VFR missile only. Performance AIM-7A Length: 3.74 m (147.3 in) Finspan: 0.94 m (37 in) Diameter: 20.3cm (8 in) Weight: 143 kg (315 lb) Speed: Mach 2.5 Propulsion: Aerojet 1.8KS7800 solid rocket Thrust: 7100lbs (3220kg) for 2.04sec Guidance duration: N/A Warhead: 20 kg (45 lb) EX25 Mod.0 warhead with 4.2kg (9.25lbs) of H.6 Detonation distance: 7.6m (25ft) Guidance type: Beam Riding Maneuvering capability: N/A Max Launch velocity: Mach 1.3 -------------------------------------------------------------------------------------------------------------------------- AIM-7B - Sparrow II Because of the above noted principal problems of the AAM-N-2, new guidance methods were searched almost from the beginning. As early as 1950, Douglas studied the possibility of equipping the Sparrow with a active radar-homing seeker. By 1955 Douglas proposed going ahead with development, intending it to be the primary weapon for the F5D Skylancer interceptor. It was later selected, with some controversy, to be the primary weapon for the Canadian Avro Arrow supersonic interceptor, along with the new Astra fire-control system. For Canadian use and as a second source for US missiles, Canadair was selected to build the missiles in Quebec. The small size of the missile forebody and the K-band AN/APQ-64-radar limited performance, and it was never able to work in testing. After considerable development and test firings in the U.S. and Canada, Douglas abandoned development in 1956. Canadair continued development until the Arrow was cancelled in 1959. Performance AIM-7B Length: 3.65 m (144 in) Finspan: 1.02 m (40 in) Diameter: 20.3cm (8 in) Weight: 190 kg (420 lb) Speed: Mach 2,67 Propulsion: Aerojet 1.8KS7800 solid rocket Thrust: 8000lbs (3628kg) for 1.84sec Guidance duration: N/A Warhead: 20 kg (45 lb) Detonation distance: 7.6m (25ft) Guidance type: Active Radar Homing (ARH) (active) Seeker range: 12km (6NM) Aerodynamic Range (50kft alt): 28km Maneuvering capability: 20g Max Launch velocity: Mach 1.3 -------------------------------------------------------------------------------------------------------------------------- AIM-7C - Sparrow III After the failure of the Sparrow II program other ways of guidance where considered. The development of the modern sparrow started in 1955 by raytheon. The Sparrow III and all subsequent versions of Sparrow used semi-active radar homing. After tests with YAAM-N-6 R&D missiles, production of the tactical AAM-N-6 began in January 1958, and it entered service in August 1958. The missile had an Aerojet solid-fueled rocket motor, and a 30 kg (65 lb) MK 38 continuous-rod warhead. Performance AIM-7C Length: 3.66 m (144 in) Finspan: 1.02 m (40 in) Diameter: 20.3cm (8 in) Weight: 172 kg (380 lb) Speed: Mach 4 Propulsion: Aerojet 1.8KS7800 solid rocket Thrust: 7100lbs (3220kg) for 2.04sec Guidance duration: 75 sec Warhead: 30 kg (65 lb) MK 38 continuous rod with 9kg (20lbs) of PBXN-4 Detonation distance: 7.6m (25ft) Guidance type: Semi Active Radar Homing (SARH) Seeker range (200W radar output): 12 km (6.5 NM) Aerodynamic Range (40kft alt): 18 km (10 NM) Maneuvering capability: 16g Max Launch velocity: Mach 1.3 -------------------------------------------------------------------------------------------------------------------------- AIM-7D Sparrow III The AAM-N-6a (AIM-7D) was similar to the -6, but used a new Thiokol liquid-fuel rocket engine for improved performance. It also included changes to the guidance electronics to make it effective at higher closing speeds. The -6a was also selected to arm the Air Force's F-110A Spectre (F-4 Phantom) fighters in 1962, known to them as the AIM-101. It entered production in 1959, with 7500 being built. Performance AIM-7D Length: 3.66 m (144 in) Finspan: 1.02 m (40 in) Diameter: 20.3 cm (8 in) Weight: 197 kg (435 lb) Speed: Mach 4 Propulsion: Thiokol MK 6 MOD 3 (LR44-RM-2) liquid-propellant rocket motor Thrust: N/A Guidance duration: 75 sec Warhead: 30 kg (65 lb) MK 38 continuous rod with 9kg (20lbs) of PBXN-4 Detonation distance: 7.6m (25ft) Guidance type: Semi Active Radar Homing (SARH) Seeker range (200W radar output): 15 km (8.3 NM) Aerodynamic Range (40kft alt): 44 km (24 NM) Maneuvering capability: 15g Max Launch velocity: Mach 2.2 -------------------------------------------------------------------------------------------------------------------------- AIM-7E Sparrow III In 1963, production switched to the AIM-7E version. It used a new propulsion system, a solid-fueled rocket by Rocketdyne (either a MK 38 or later a MK 52). The new motor again significantly increased range and performance of the missile. Effective range of course depended greatly on firing parameters like launch speed and relative velocity of the target. In head-on attacks under optimal conditions, it could be as high as 35 km (20 nm), while in stern attacks, maximum effective range was more around 5.5 km (3 nm). About 7500 AIM-7D and 25000 AIM-7E missiles were built, and the Sparrow was used heavily in Vietnam by the USAF and the U.S. Navy. The first combat kill was scored on 7 June 1965, when USN F-4B Phantoms shot down 2 MiG-17s. However, the initial combat results were very disappointing. The potentially long range of the AIM-7 could not be used, because unreliable IFF capabilities of the time effectively required visual identification of all targets. Coupled with the high minimum range of the missile of 1500 m (5000 ft) and poor performance against manoeuvering and/or low-flying targets, this led to a kill probability of less than 10%. Therefore, the improved AIM-7E-2 was introduced in 1969 as a "dogfight missile". It had a shorter minimum range, clipped wings for higher manoeuverability, and improved autopilot and fuzing. The AIM-7E-3 had further improved fuzing and higher reliability, and the AIM-7E-4 was specially adapted for use with high-power fighter radars (like the F-14's AN/AWG-9). Despite all problems, more than 50 aircraft were shot down by Sparrow missiles during the Vietnam air war. Performance AIM-7E Length: 3.66 m (144 in) Finspan: 1.02 m (40 in) Diameter: 20.3cm (8 in) Weight: 197 kg (435 lb) Speed: Mach 4 Propulsion: Rocketdyne MK 38/MK 52 solid rocket Thrust: 7600lbs (3447kg) for 2.9 seconds Guidance duration: 75 sec Warhead: 30 kg (65 lb) MK 38 continuous rod with 9kg (20lbs) of PBXN-4 Detonation distance: 9.1m (30ft) Guidance type: Semi Active Radar Homing (SARH) Seeker range (200W radar output): 25 km (13.5 NM) Aerodynamic Range (40kft alt): 50 km (27 NM) Maneuvering capability: 25g Max Launch velocity: Mach 2.2 -------------------------------------------------------------------------------------------------------------------------- AIM-7F Sparrow In January 1972, Raytheon began development of the vastly improved AIM-7F. It featured a new dual-thrust (boost/sustain) rocket motor (usually a Hercules MK 58, but sometimes an Aerojet MK 65), which greatly increased the missile's range. The AIM-7F also had a completely new solid-state electronic guidance and control system (GCS), designated AN/DSQ-35, which was also compatible with modern pulse-doppler radars. Continued improvement of the GCS resulted in versions from AN/DSQ-35A through -35H (used in the AIM-7F-11). The smaller GCS permitted the use of a larger 39 kg (86 lb) MK 71 warhead in the new WAU-10/B warhead section. Production began in 1975, and continued through 1981. With the AIM-7F, the official name of the missile was changed from Sparrow III to plain Sparrow. Performance AIM-7F Length: 3.66 m (144 in) Finspan: 1.02 m (40 in) Diameter: 20.3cm (8 in) Weight: 231 kg (510 lb) Speed: Mach 2.9 Propulsion: Hercules MK 58 dual-thrust solid rocket Thrust: Boost 5750lbs (2608kg) for 4,5 seconds Sustain 1018lbs (461kg) for 11 seconds Guidance duration: 75sec Warhead: 39 kg (86 lb) MK 71 continuous rod Detonation distance: 12.2m (40ft) Guidance type: Semi Active Radar Homing (SARH) Seeker range (200W radar output): 40 km (22 NM) Aerodynamic Range (40kft alt): 98km (53 NM) Maneuvering capability: 25g Max Launch velocity: Mach 2.5 -------------------------------------------------------------------------------------------------------------------------- AIM-7G Sparrow The AIM-7G was a version with a new seeker, developed for the USAF around 1970 for use by the F-111D aircraft. A few YAIM-7G prototype missiles were built, but this version did not enter production. -------------------------------------------------------------------------------------------------------------------------- AIM-7M / P / R Sparrow The next version of the AIM-7 was the AIM-7M, whose main new feature was the new inverse monopulse seeker for look-down/shoot-down capability in a new WGU-6/B (later WGU-23/B) guidance section. There is no evidence of any Sparrow variants officially designated -7J/K/L (although the designation AIM-7J is sometimes associated with the AIM-7E license-built in Japan). Source [2] says that the suffix "M" was deliberately chosen to mean "monopulse", suggesting that suffixes J/K/L were indeed skipped. The monopulse seeker improves missile performance in low-altitude and ECM environments. Other new features of the AIM-7M are a digital computer (with software in EEPROM modules reprogrammable on the ground), an autopilot, and an active fuze. The autopilot enables the AIM-7M to fly optimized trajectories, with target illumination necessary only for mid-course and terminal guidance. The AIM-7M also has a new WDU-27/B blast-fragmentation warhead in a WAU-17/B warhead section. The first firing of a YAIM-7M occured in 1980, and the AIM-7M entered production in 1982. The AIM-7P is similar in most ways to the M versions, and was primarily an upgrade program for existing M-series missiles. The main changes were to the software, improving low-level performance. A follow-on Block II upgrade added a new rear receiver allowing the missile to receive mid-course correction from the launching aircraft. Plans initially called for all M versions to be upgraded, but currently P's are being issued as required to replace M's lost or removed from the inventory. The final version of the missile was to have been the AIM-7R, which added an infrared homing seeker to an otherwise unchanged AIM-7P Block II. A general wind-down of the budget led to it being cancelled in 1997. Performance AIM-7M / P Length: 3.66 m (144 in) Finspan: 1.02 m (40 in) Diameter: 20.3cm (8 in) Weight: 231 kg (510 lb) Speed: Mach 4 Propulsion: Hercules MK 58 dual-thrust solid rocket Thrust: Boost 5750lbs (2608kg) for 4,5 seconds Sustain 1018lbs (461kg) for 11 seconds Guidance duration: 75sec Warhead: 39 kg (86 lb) MK 71 continuous rod Detonation distance: 12.2m (40ft) Guidance type: Semi Active Radar Homing (SARH) Seeker range (200W radar output): 40 km (22 NM) Aerodynamic Range (40kft alt): 98km (53 NM) Maneuvering capability: 30g Max Launch velocity: Mach 2.5 Sources: Text based (and some performance): http://www.designation-systems.net/dusrm/m-7.html https://en.wikipedia.org/wiki/AIM-7_Sparrow#Sparrow_III Performance sources: http://alternatewars.com/SAC/AAM-N-6_Sparrow_III_SAC_-_30_July_1960.pdf http://alternatewars.com/SAC/AIM-7F_Sparrow_III_SMC_-_January_1977.pdf http://alternatewars.com/SAC/AIM-7F_Sparrow_CS_-_January_1976.pdf https://apps.dtic.mil/dtic/tr/fulltext/u2/323370.pdf https://apps.dtic.mil/dtic/tr/fulltext/u2/335620.pdf https://apps.dtic.mil/sti/pdfs/ADA142508.pdf https://www.forecastinternational.com/archive/disp_old_pdf.cfm?ARC_ID=1098 https://www.forecastinternational.com/archive/disp_pdf.cfm?DACH_RECNO=600 Report on the Air to Air missile system capability review july November 1968 http://www.astronautix.com/s/sparrowaim-7e.html http://alternatewars.com/SAC/F4D-1_Skyray_-_XAAM-N-3_Sparrow_II_MSC_-_1_July_1957.pdf http://alternatewars.com/SAC/F4D-1_Skyray_and_YAAM-N-6_Sparrow_MSC_-_1_July_1957.pdf
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