Table of Contents

Aerodynamics Series

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