Delta-V for a Hohmann transfer between LEO and GEO.
Start in a 200 km circular 9.1 deg orbit. The initial orbit and transfer orbit mass are acheivable by a Falcon 1e rocket.
The Falcon 1e can lift smaller masses into higher orbits so this is not necessarily the best you can do with the Falcon 1e.
Since version 8. ------------------------------------------------------------------------ See also OrbMnvrInclAndHohm and RocketMass. ------------------------------------------------------------------------
Contents
%------------------------------------------------------------------------------- % Copyright (c) 2009 Princeton Satellite Systems, Inc. All rights reserved. %------------------------------------------------------------------------------- h = 200; % km Orbit height at separation i = 9.1; % deg Orbit inclination at separation rI = 6378.165 + 200; % km Initial orbit radius rF = 42167; % km Final orbit radius iI = i*pi/180; % Initial inclination iF = 0; % Final inclination (geosynchronous)
Compute the required velocity change
%------------------------------------- [deltaV, deltaI, tOF] = OrbMnvrInclAndHohm( rI, rF, iI, iF ); mP = 170; % kg payload. This makes mT what the Falcon 1e can lift. iSP = 290; % sec for a modern solid. Liquids can do better. structuralRatio = 0.1;% Not the best
Design the transfer orbit stage
%-------------------------------- if( exist('RocketMass','file') ) [mF, mT, mS] = RocketMass( iSP, mP, structuralRatio, deltaV.total ) ; else mF = 0; mT = 0; mS = 0; warning('Function "RocketMass" (in Propulsion module) not found. Cannot compute fuel and structural mass.') end fprintf('\nGeo transfer from %4.1f km and %4.1f deg\n',h,i); fprintf('Structural ratio = %8.1f\n', structuralRatio) fprintf('Isp = %8.1f sec\n', iSP) fprintf('Total mass = %8.1f kg\n', mT) fprintf('Fuel mass = %8.1f kg\n', mF) fprintf('Structural mass = %8.1f kg\n', mS) fprintf('Payload mass = %8.1f kg\n', mP) fprintf('Transfer orbit time = %8.1f hours\n', tOF/3600) fprintf('Total Delta-V = %8.2f km/s\n', deltaV.total) %--------------------------------------
Geo transfer from 200.0 km and 9.1 deg Structural ratio = 0.1 Isp = 290.0 sec Total mass = 986.3 kg Fuel mass = 742.1 kg Structural mass = 74.2 kg Payload mass = 170.0 kg Transfer orbit time = 5.3 hours Total Delta-V = 3.97 km/s