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Fixed background

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Mate Kerenyi

on 19 December 2013

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Transcript of Fixed background

Launch Project
2013.10.18. Stockholm, Sweden
KTH - Royal Insitute of Technology
Fundamentals of Spaceflight
Ann Hyvärinen
Gaspard Lhermitte
Martin Johansson
Máté Kerényi
Muzammil Chohan

Date & Time
The task
Send a satellite to orbit:
- Desired orbit: sun synchronized
- Desired altitude: 500 [km]
- Desired weight of satellite 500 [kg]
- Use two stages
- Make it as cheap as possible
The approach
- Grasshopper like rocket
- Lifting body spacecraft
- Gravity turn trajectory
- Atmospheric effects
Launch Site
- Orbit inclination: 97.4°
- Retrograde orbit
- Maximum latitude 82.6°
- Launch site: Esrange [SWE], 67.5°
- Azimuth: -20°
- Strict vertical trajectory
- Thrust control
- Cut thrust at 100 [km] / 190 [s]
- Maximum climb velocity: 1.6 [km/s]
First stage
- Level out around 230 [km]
- Remaining fuel: 1.8 [t]
- Free fall
- Return and breaking concepts:
- Engines
- Parachutes
- 3 [m/s] landing velocity
- Landing on landing legs
First stage return
- Altitude: 205 [km]
- Vertical velocity: 0.75 [km/s]
- Separattion complete
- Second stage is in horizontal position
- Second stage facing against Earth's rotation
- Apply thrust
Reaching orbit
- Reaching orbit in T+750 [s]
- Horizontal velocity: 7,7 [km/s]
- Altitude: 500 [km]
- Placing satellite to orbit
- Start breaking maneuvers for reentry

Second stage reentry
Second stage
- Mass after separation: 6000 [kg]
- Gravity turn trajectory
- Accelerating until altitude 300 [km]
- Burning 75 [%] of it's fuel
- Arrive to an eliptic orbit
- Transfer to 500 [km] circular orbit
- Increase speed by 810 [m/s]
Thank you for your attention!
- Skip reentry
- Lifting body 'glider'
- Heat protection
- Target location: launch site
- Landing on landing gears
- Final mass 500 [kg] + leftover fuel
The rocket
- Main variable: propellant mass
- Burn rate efficiency
- High Isp desired [455s]
- Liquid H and liquid O fuel
- Initial launch mass: 24 [t]
Full transcript