2022 03 09 Dongtan Park
2022 04 10 Suwon Hwasung
2022 04 11 Gwang-gyo Park
2022년 5월 2일 월요일
2022년 4월 2일 토요일
Few Ballistic Missile Analysis w/ Aerospace-SIM - Part. 7 - Hwasong 17 (Comparing Size)
[See Previous Contents]
Brugge (http://www.b14643.de/) brought good speculation about specification of Hwasong-17 which have some different assumption compare to mine (Few Ballistic Missile Analysis w/ Aerospace-SIM - Part. 5 - Hwasong 12, 15, and 17).
Brugge's model do not assume that 2nd stage of Hwasong-17 is not larged from 15's; it requires heavier 1st stage than mine and assumed portion (7~11%) of 1st stage can brought proper range speculation.
--- ICBM
3. Hwasong-17 (based on Brugge's Model)
Flyback-Booster concept proposal and its trajectory analysis w/ Aerospace SIM
[See Previous Contents]
This is a new proposed concept that minimizing launch cost, expendable part
1. Air-Launch for free launch angle, adding kinematic energy,
2. Recovery 1st Stage Part - which lands sea-surface smoothly - validated later
3. 2nd/3rd Stage 1-time-use
Concept Art, 1st stage art is borrowed from Russian Baikal Booster, however this booster is not engine propelled, using expanded glide wing only.
Becuase mother aircraft is limited to small-transport, MTOW is less than 25t with 300kg payload. Target altitude is 600km with 7.9km/s. Weight of empty structure is assumed as 20% of propellant mass.
Initial sizing is 600km with 7.5km/s with specific mass distribution. Engine ISP is assumed as typical liquid propelled engine.
Sensitivity result for mass distribution change.
In order to keep same total velocity, rocket need additional 5.7t for 1st stage.
30t rocket from air could reach powerful LEO condition.
30.4t rocket could increase payload from 300 to 405kg.
Air-Launch condition added 0.12km/s for Rocket at 24deg Latitude.
If 1st stage is changed to solid motor, because of low ISP, rocket should be increased to 28.7t
Gliding Analysis for Wing-Extended configuration; OpenVSP is used
L/D is not optimized yet but tested
Although, L/D is not fully optimized it land <300ft/min at M0.3 Speed.
SUMMARY
Concept study for Flyback-Booster
20t class rocket with 300kg payload is feasible; land-launch requires additional weight.
- 0.12km/s is added by aircraft condition.
Landing condition is reviewed and it shows glide-wing made <300ft/min landing at M0.3.
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