Table of Contents

Aerodynamics Series

2019년 2월 28일 목요일

Boeing revealed New Loyal-Wingman


* Related my previous articles for 6th Gen. Fighters (Also for Hypersonic MIRV Air-to-Air Missile)
   -> History of Air-warfare Part 2 (2017.04.21)
   -> French-German's proposal for replacement of Tornado jet (2018.01.28)
   -> USAF-2030 Commercial (2018.03.27)
   -> High AoA capability become useless in future air-warfare? (laser, stealth, hypersonic, etc) (2018.05.04)
   -> Current Technical Difficulties in Hypersonic MIRV Air to Air Missile (2018.05.10)
   -> Small-note-for-SRAAM and Their Futures (2018.05.23)
   -> French-German's proposal for replacement of Tornado jet (2) (2018.07.06)
   -> New-fighter-jet-for-UK:Tempest (2018.07.16)
   -> Example-of-booster-with-SRAAM : New Solution of Long-Range Air-to-Air Missile? (2018.07.20)
   -> More Information for UK's Tempest (2018.08.04)
   -> Small Note for Concept of 6th Generation Fighters : And Future Aerial-Warfare (2018.09.02)
   -> French-German's proposal for replacement of Tornado jet (3) (2018.10.27)
   -> French-German's proposal for replacement of Tornado jet (4) (2019.02.15)

  * Related my previous articles for Stealth Tankers (USN's MQ-25 and USAF's Stealth Tanker project)
   -> Boeing's-mq-25-candidate is revealed (2018.03.08)
   -> Boeing's design is Now MQ-25 (2018.08.31)
   -> Boeing MQ-25 - Additional Images (2018.08.31) 

  * Related my previous articles for UCAV
   -> New Russian UCAV is revealed (2019.01.27)


 Boeing has revealed New Loyal-Wingman as a new concept of UCAV like FCAS, S-70, X-47B, and they announced Australia involved in this project. Some summarized features and figures from the link are shown below. 

(http://thedrive.com/the-war-zone/26656/boeing-will-unveil-this-loyal-wingman-combat-drone-for-australias-air-force-tomorrow , https://www.secretprojects.co.uk/forum/index.php/topic,31452.0.html)



  • It is built in Australia and intended for export around the globe. Exports will be easier without having to go through U.S. FMS process. 
  • A prototype is being built now.
  • Can fly with or without a manned partner.
  • Has a range of roughly 2,000 miles.
  • Is 38 feet long and uses a bizjet class engine.
  • Will team with E-7, EA-18G, F/A-18E/F, and P-8 Poseidon.
  • Modular design for 'snap-in' payloads and rapid reconfiguration capability.
  • Initial configuration will be sensor/intelligence and electronic warfare focused.
  • Controlled via ground station, other aircraft, and has some level of autonomy that can scale for the mission. 
  • Design was based mainly on what would be attractive to a global market full of cash-strapped air arms.
  • Will be tested over Australia's vast deserts where there is tons of room for experimentation. (Probably based out of Woomera)
  • The technology and development will be sourced locally in Australia.
  • Boeing will be able to adapt the technology for foreign customers far easier than developing and building in the United States. 








 Core concepts of the system are 'stealth', 'team-work', 'modular-payload', 'big-sensor', and 'long-range(2000nm ferry?)' while small-business-jet engine based propulsion probably do not pursue supersonic performance. Still, there is a possibility that low-supersonic performance (<M1.4) can be obtained depending on the thrust, but it could degrade range performance. 


 Initial configuration of the concept will concentrate on ISR and electronic warfare. Boeing probably propose these aircraft as a good redeem-er for the Super-hornet family which has lack of stealth, and long-range. 

 External configuration of the jet is similar to Northrop-Grumman's JSF; usual UCAV configuration is flying-wing and is very interesting. Most recent military purpose UAV of Boeing, MQ-25, is also the conventional wing-configuration rather than flying-wing. Probably, Boeing, one of the biggest airliner maker, already has confidence that they could optimize range performance of the aircraft without choosing flying-wing configuration. Because they selected V-tail, they could use simpler flaperon. 

 Relatively big-sized nose could adopt independent level of radar compared to other slim-sized flying wing configuration. Modular payload would be located at the beneath of the jet containing AIM-120s, SDBs, ECM pods. Because of the small size, only one JDAM-ER is probably loaded like weapon pod of Advanced Hornet (Weapon-Pod-for-Super-Advanced-Hornet




 The aircraft could attract many air forces suffering lack of the number of aircraft due to their high cost. Without harming range performance of the big-manned aircraft, the concept pursue day-1-strike capability. I expected that the aircraft targeted high-subsonic or low supersonic with stealth performance while about one-advanced-weapon-pod is internally carried probably

2019년 2월 14일 목요일

B747 Airborne Carrier Concept

 
 Recently, I found few interesting video related to Airborne Carrier concept using commercial airliners



2019년 2월 9일 토요일

W.I.P status of Missile-SIM : Addition of Air-propulsion part 2

Previous Work Status

Initial Version of Missile-SIM for Performance evaluation
Aerodynamic Validation of Missile-SIM for Trajectory 
AIM-120C Study using Missile-SIM : Part 1 - Sensitivity
AIM-120C Study using Missile-SIM : Part 2 - Launch Condition
AIM-120C Study using Missile-SIM : Part 2 - Launch Condition - revision
Patch note of Missile-SIM : Guidance Algorithm is added w/ Real-Time plot
W.I.P status of Missile-SIM : Addition of Air-propulsion part 1

 3. CFD DB with Ramjet engine Air-to-Air missile (Generic shape)

 Based on the two-dimensional result of the inlet in the previous article, I have designed the generic Meteor-type missile (AIM-120 sized air-to-air missile w/ Ramjet). Difference between Meteor and the generic one is location of the inlet while internal layout of the inlet is purely based on the imagination. 

 CFD DB work is conducted from M1.1 to M4.0 covering most flight region of the missile, and CFD could roughly capture flow change via speed and AoA variation. Also there is shock structure change near the inlet lip is shown for each Mach number. 



M1.6 AoA0 Pressure Contour

M1.6 AoA0 Velocity Contour




M3.3 AoA0 Pressure Contour

M3.3 AoA0 Temperature Contour


M3.3 AoA0 Velocity Contour


M4.0 AoA0 Pressure Contour


M4.0 AoA0 Velocity Contour



 4. Configuration of Baseline for Ramjet engine Air-to-Air missile (Generic shape)

 Based on the result of previous CFD works (Although it is just rough estimation) and ISP functions, I have developed generic Ramjet engine Air-to-Air missile. I have set the detailed value for ramjet related data using estimation, and more detailed comparison for the conventional AIM-120C will be dealt in the next article. 


Test of Ramjet missile in Missile-SIM