Satellite is deployed by two stage rocket booster Goes from 185km parking orbit

Question

Satellite is deployed by two stage rocket booster Goes from 185km parking orbit to 35,700km GEO altitude Key Assumptions/known's: Satellite dry mass is 3,580kg Station keeping requires 5kg/yr propellant, and service life is 15 years Booster stages are LO2/LH2 (1st stage l_sp=375sec, 2nd stage l_sp=462sec) 1st stage MECO @ 4.72km/sec, core dry mass 25,400kg 2nd stage dry mass 2,480kg 2nd stage carries all propellant needed for LEO-GEO transfer delta V 2nd stage takes satellite to 185km, then boosts to GEO LO2/LH2 mixture ratio is 5.85:1 (by mass) Find: Propellant required for each stages (LO2 and LH2 respectively) - mass and volume Find the launch mass for the mission (GLOW) Compare to existing boosters and satellites, of similar mission, for size comparison

Explanation / Answer

1) Mass of LO2 = 25400 * 5/2.14   = 59345.8 kg

      Volume =   5200 L

   Mass of LH2 =   25400 * 5/4 = 31750 kg

    Volume   =   2136 L

2)    launch mass =   2480 * 21/3.562

                             =   4109.33 kg

3)   Satellites are about 76 times in size as compared to existing boosters .

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.