Table of Contents

Aerodynamics Series

2019년 12월 13일 금요일

Qantas select A350-1000ULR as Project Sunrise



 Several sources announced that Qantas selects A35K as their new Project Sunrise. 

 Direct airline to New York or London from Sydney. Without a doubt, it testify limit of aerodynamic efficiency of the two airliner giants, Airbus and Boeing. 

 777-8X and A350-1000ULR compete to be selected by Qantas, however, A35K has advantages in both newer technology in efficiency and operation proof by other airliners. Unfortunately, 787 series having better fuel economy is smaller for Qantas while 777X series evolved from the past cannot even complete the first flight. 

 Project Sunrise itself only ordered 12 aircraft however, it could open the new area of airlines for their range. 

 I hope there will be a new supersonic airliners in near future. 

2019년 12월 10일 화요일

Flight-SIM : Trajectory & Performance Analysis for Jet Aircraft


Previous Work Status

Missile-SIM : Performance Evaluation for Iskander / Kh-47M2 Kinzhal & ATACMS+Booster

The new topic for My page : Optimization of Supersonic aerodynamic aircraft


1. Introduction & Configuration of Flight-SIM

 As a new tool replacing Missile-SIM, I am now conducting Flight-SIM which consider more variables such as pitching moment, throttle-able engine, complex drag DB, trajectory optimization. Specifically, sophisticated trajectory optimization will be made similar to that of real-airliners.  

 Compared to Missile-SIM, it will more appropriate to evaluate range of the fixed-wing aircraft. 

 Next time, I will show the sample of the DB. 















2019년 11월 18일 월요일

F-22 Demo in Dubai & Emirates' A350

 Enjoy the footage of the Dubai Airshow from F-22

 And there is an announcement that Emirates will buy A350s (Order modification from A380 to A350)

 https://aviationweek.com/dubai-air-show/emirates-converts-airbus-a380-order-a350s





 More interesting news will come

2019년 11월 13일 수요일

Missile-SIM : Performance Evaluation for Iskander / Kh-47M2 Kinzhal & ATACMS+Booster


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
W.I.P status of Missile-SIM : Addition of Air-propulsion part 2
AIM-120C Study using Missile-SIM : Part 3 - CUDA / LREW / METEOR types. 1 : Baseline Comparison
AIM-120C Study using Missile-SIM : Part 3 - CUDA / LREW / METEOR types. 2 : Sensitivity Analysis
AIM-120C Study using Missile-SIM : Part 3 - CUDA / LREW / METEOR types. 3 : Few mentions
W.I.P status of Missile-SIM : Addition of 3D Coordinate
W.I.P status of Missile-SIM : Development of Few generic bodies for Further Missile-SIM
Missile-SIM : Performance Evaluation for ATACMS class missile
Missile-SIM : Performance Evaluation for KM-SAM class missile
Missile-SIM : Effectiveness of Rocket motor for free-fall bomb

 1. Modeling of Iskander / Kh-47M2 & ATACMS + Booster

 Geometry related to aerodynamics Iskander and its modeling is shown below.






 Except booster part, ATACMS part is same as the previous model
(Missile-SIM : Performance Evaluation for ATACMS class missile)


  2. Trajectory Simulation of the Iskander / Kinzhal and ATACMS w/ Booster

 Based on the modeled missile, I simulated a few trajectory options using Missile-SIM. 


1) Normal version of Iskander (~170km)


It has normal short range ballistic missile characteristics; peak altitude is about 40km w/ <M5 burn out velocity. 


2) Iskander-M (~250km)


Bigger ISP, slightly larger amount of propellant and better trajectory gives significantly better range than the normal version. 





3) Iskander-M (~350km)


The projectile after burning whole fuel has less drag at the high altitude. Indeed if the missile glide less deeper angle, range could be extended.






4) Iskander-M (~500km)


Its maximum range is about 500km. Iskander-M missile could cover the entire Korean peninsula.







5) Iskander-M as Kinzhal = Air-launched Iskander from MiG-31 (~170km)

If the Iskander-M were launched at 40,000ft w/ M1.3, range is increased about 1,000km class. Because missile enter the 'almost-no-drag' altitude, missile has much higher burn-out velocity and longer range. 




6) ATACMS+Booster (~500km)

If we given the ATACMS booster, range become similar to that of Iskander-M. (However, ATACMS has smaller warhead weight than that of Iskander-M)




7) Air-Launched ATACMS+Booster



JTACMS in the previous article (Missile-SIM : Performance Evaluation for ATACMS class missile) shows about 250km class range. 

 If we attached booster for JTACMS, what happens? 

 Similar to Iskander-M, it could extend its range for more than 1,000km. 





3. Conclusion

 Boosted ATACMS and Iskander-M model are compared for ground and air-launched version. Both missiles having several hundred kilometer range could have extended range using air-launched method. 


I also tested hypersonic glider or three-stage rocket however, these have almost infinite range as intercontinental weapon. Indeed, I decided not to study seriously about them (as shown below)

From now on, I will focus on the upgrade of Missile-SIM as Flight-SIM for more advanced vehicle
(Supersonic Civil Aviation Area)



Appendix : Hypersonic Glider case (Almost act like a LEO projectile)












Pictures from Gimpo Airport (RKSS) & Songshan Airport (RCSS)

I had taken some pictures from Gimpo and Songshan while I traveled Taiwan. 

There is no ordering for aircraft at this time. 


1. Gimpo























2. Songshan