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I am skeptical about high tech manufacturing in space, especially in the dusty lunar environment. Factories are big, and need a lot of PhDs to keep them running. 100 years from now, there will be many such factories in space, but for now, we have problems locating them in most countries around the world, where there is air and water and food and FedEx. I am skeptical about high tech manufacturing in space, especially in the dusty lunar environment. Factories are big, and need a lot of !PhDs to keep them running. 100 years from now, there will be many such factories in space, but for now, we have problems locating them in most countries around the world, where there is air and water and food and !FedEx.
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That said, there are plenty of uses for deadweight mass in space, as ballast and as a source of momentum. Earth launch is expensive, and is deficient in angular momentum compared to destination orbits.
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Assuming we can get material launched from the moon ( 4.5% of the escape energy and launch loop track length ) Assuming we can get material launched from the moon ( 5.5% of the escape energy and launch loop track length ), there are plenty of uses for deadweight mass in space, as ballast and as a source of momentum. Earth launch is expensive, and is deficient in angular momentum compared to destination orbits.
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||<-4> Earth and earth orbits ||
|| $ \mu_e $ || Earth gravitational parameter || 3.986004418e+14 || m^3^/s^2 ||		 ||<-4> ''Earth''            ||
|| $ \mu_e $ || Earth gravitational parameter || 3.986004418e+14 || m^3^/s^2^||
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|| $ E_e $ || Earth escape energy || 62.494807  || MJ/kg || || $ E_e $ || Earth escape energy || -62.494807 || MJ/kg ||
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|| $ r_{GEO} $ || Geosynchronous radius || 42164172.4 || m ||
|| $ v_{GEO} $ || Geosynchronous velocity || 3074.66 || m/s ||
||<-4> Moon ||
|| $ \mu_m $ || Lunar gravitational parameter || 4.9027779e+12 || m^3^/s^2 ||		 ||<-4> ''Geostationary orbit'' ||
|| $ r_{GEO} $ || GEO radius || 42164172.4 || m ||
|| $ v_{GEO} $ || GEO velocity || 3074.66 || m/s ||
|| $ E_{GEO} $ || GEO Energy/kg || -1.41803E+07 || J/kg ||
|| $ H_{GEO} $ || GEO Angular momentum/kg || 1.2964E+11 || m^2^/s ||
||<-4> ''M288 Server Sky orbit'' ||
|| $ r_{288} $ || M288 radius || 12788978 || m ||
|| $ v_{288} $ || M288 velocity || 5582.79 || m/s ||
|| $ E_{288} $ || M288 Energy/kg || -4.6751244E+07 || J/kg ||
|| $ H_{288} $ || M288 Angular momentum/kg || 7.1398E+10 || m^2^/s ||
||<-4> ''Moon'' ||
|| $ \mu_m $ || Lunar gravitational parameter || 4.9027779e+12 || m^3^/s^2^||
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||<-4>Hohmann orbit from moon to GEO - $ r_a = a_m  ~ ~ ~ r_p = r_{GEO}         ||
|| $ a_{m-GEO}$ || Lunar-GEO semi-major axis ||
|| $ e_{m-GEO}$ || Lunar-GEO eccentricity ||
|| $v_{a-m-GEO}$|| Lunar-GEO apogee velocity ||
|| $v_{l-m-GEO}$|| Lunar-GEO launch velocity ||
|| $v_{p-m-GEO}$|| Lunar-GEO perigee velocity ||
|| $v_{i-m-GEO}$|| Lunar-GEO insertion velocity ||		 ||<-4>Hohmann orbit from moon to GEO ` ` $r_a = a_m ~ ~ ~ ~ r_p = r_{GEO} $ ||
|| $ a_{m-GEO}$ || Lunar-GEO semi-major axis ||  213281586 || m ||
|| $ e_{m-GEO}$ || Lunar-GEO eccentricity ||  0.8023075 || ||
|| $v_{a-m-GEO}$|| Lunar-GEO apogee velocity ||   452.7650 || m/s ||
|| $v_{l-m-GEO}$|| Lunar-GEO launch velocity || -2442.6935 || m/s ||
|| $v_{p-m-GEO}$|| Lunar-GEO perigee velocity ||  4127.7325 || m/s ||
|| $v_{i-m-GEO}$|| Lunar-GEO insertion velocity || -1053.0725 || m/s ||

MORE LATER

Lunar Material and Momentum Supply

I am skeptical about high tech manufacturing in space, especially in the dusty lunar environment. Factories are big, and need a lot of PhDs to keep them running. 100 years from now, there will be many such factories in space, but for now, we have problems locating them in most countries around the world, where there is air and water and food and FedEx.

Assuming we can get material launched from the moon ( 5.5% of the escape energy and launch loop track length ), there are plenty of uses for deadweight mass in space, as ballast and as a source of momentum. Earth launch is expensive, and is deficient in angular momentum compared to destination orbits.

Earth and Moon and interesting orbits

Earth

\mu_e

Earth gravitational parameter

3.986004418e+14

m3/s2

r_E

Earth equatorial radius

6378137

m

E_e

Earth escape energy

-62.494807

MJ/kg

\omega_e

Earth angular frequency

7.29211515e-5

radians/s

Geostationary orbit

r_{GEO}

GEO radius

42164172.4

m

v_{GEO}

GEO velocity

3074.66

m/s

E_{GEO}

GEO Energy/kg

-1.41803E+07

J/kg

H_{GEO}

GEO Angular momentum/kg

1.2964E+11

m2/s

M288 Server Sky orbit

r_{288}

M288 radius

12788978

m

v_{288}

M288 velocity

5582.79

m/s

E_{288}

M288 Energy/kg

-4.6751244E+07

J/kg

H_{288}

M288 Angular momentum/kg

7.1398E+10

m2/s

Moon

\mu_m

Lunar gravitational parameter

4.9027779e+12

m3/s2

r_m

Lunar equatorial radius

1738140

m

E_m

Lunar escape energy

2.8207037

MJ/kg

a_m

Lunar orbit semi-major axis

384399000

m

v_m

Lunar orbit velocity

1023.155

m/s

t_m

Lunar orbit period

2360591.5

seconds

\omega_m

Lunar orbit angular frequency

2.66169954e-6

radians/s

Hohmann orbit from moon to GEO       r_a = a_m ~ ~ ~ ~ r_p = r_{GEO}

a_{m-GEO}

Lunar-GEO semi-major axis

213281586

m

e_{m-GEO}

Lunar-GEO eccentricity

0.8023075

v_{a-m-GEO}

Lunar-GEO apogee velocity

452.7650

m/s

v_{l-m-GEO}

Lunar-GEO launch velocity

-2442.6935

m/s

v_{p-m-GEO}

Lunar-GEO perigee velocity

4127.7325

m/s

v_{i-m-GEO}

Lunar-GEO insertion velocity

-1053.0725

m/s

MORE LATER

LunarSupply (last edited 2018-10-14 06:09:07 by KeithLofstrom)