Table of Contents

Aerodynamics Series

2019년 3월 23일 토요일

AIM-120C Study using Missile-SIM : Part 3 - CUDA / LREW / METEOR types. 1 : Baseline Comparison

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

 5. Comparison of Generic CUDA / AIM-120C / CUDA+Booster / Ramjet(Meteor)

 After addition of Air-breathing propulsion part for the Missile-SIM, I could describe the ramjet style air-to-air missile like Meteor. Precise configuration of the missile cannot be done because of security reason, indeed, I develop my own model based on the disclosed specification and my speculation. 

 So, contents of the simulation cannot be Real-one, but, except this, simulation could provide insight for the comparison purpose. 

 In this chapter, I want to compare CUDA / AIM-120C / CUDA+Booster / Meteor type missiles while external design of the missiles are not exactly matched to known design. However, I tried to match class of the missile roughly. 

 As you could see in my previous articles, additional CFD works for new OML configuration of CUDA and Meteor class missiles. Coefficient of fuel heat value of the Meteor missile is fitted to about 150km range with 100s of burn. Comparison for the baseline configuration and launch condition is shown below. 

 1) Two medium range missiles, CUDA and AIM-120C showed 37 and 65km respectively while CUDA is assumed as half of total and fuel weight. In short range, difference between the two missiles are not significant. 

 2) CUDA + Booster has same dimension of AIM-120C has the fastest speed and longer range than AIM-120C, however, difference between AIM-120C and CUDA+Booster did not met the expectation especially compare to its added complexity. 

 3) Ramjet has massive potential at long-range shot because of its enhanced ISP via air-breathing engine. Meteor missile could have disadvantage due to its complex aerodynamics and relatively lower acceleration than the conventional solid-fuel-rocket. 

 4) Enhancement of the CUDA+Booster version could be achieved by long-burn style motor; excessive high speed generate larger drag at high speed. 

 ** Altitude Effect

 1) In some region, maximum speed of the missile simulation is impractical; this could be fixed by throttle-able ramjet or rocket however, for comparison, thrust is fixed. 

 2) CUDA missile can be supplement of AIM-120C; but CUDA+Booster concept is not impressive as METEOR type for its range although it had significant higher speed potential. 

 3) Air-breathing type engine is sensitive to altitude effect naturally, however, it has much stronger endurance in its engine. 

 ** Launch Speed Effect

 1) As described in the sensitivity analysis of AIM-120C, effect of launch speed is linear not like effect of altitude. 

2019년 3월 22일 금요일

New payload or test vehicle for F-15E

 Unknown new experimental payload is shown for F-15E; it seems at least 3,000lb class with huge booster. 

 More specific information should be figured out in future news. 

2019년 3월 10일 일요일

Ethiopian Airlines 737 MAX Crashes

Still, many things including cause of the incident are unclear. 

149 Passengers were on-board. 

2019년 3월 8일 금요일

XQ-58A makes first flight

* 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 revealed New Loyal-Wingman (2019.02.28)

 XQ-68A made her first flight; compare to Boeing's Loyal Wingman, it is launched from air-borne mother-platform, and recovered by parachute. 

 So, Kratos insists their concept is much cheaper solution than F-16-sized-Boeing's which has conventional landing gear and required airbase. 

 Trend of future air-warfare definitely moves from strong-single-platform to combination of various assets, and this kinds of aircraft will form big-market. Still, there are numerous concepts to take the lead of the future market, and it is interesting to watch who will be the winner. 

2019년 3월 7일 목요일

Raytheon Wins $63.3 Million DARPA Contract for Hypersonic Weapons Work

 Hypersonic weapon, boost-glider type, is also now developed by Raytheon; shape of the glider is like flattened triangle. Much of the details are not disclosed while Darpa announced this missile is accelerated by rocket and glided to its target.

 Contrast to the competitive concept, scramjet, it is less efficient however, it is relatively easy(?) to make. Most of the countries, investing their power on hypersonic region, studied both concepts for the next generation strike weapon.