ph_main1 = CreatePropellantResource(MAX_MAIN_FUEL1); // main tank stage 1
ph_main2 = CreatePropellantResource(MAX_MAIN_FUEL2); // main tank stage 2
RM1 = CreateAttachment(false, _V(0, 0, 1.111), _V(0, 0, -1), _V(0, 1, 0), "RM1", false);
th_main[0] = CreateThruster(_V(0, 0, 0), _V(0, 0, 1), 184752.84, ph_main1, ISP); //THRUSTER FOR 1ST STAGE ALONE
thg_main = CreateThrusterGroup(th_main, 1, THGROUP_MAIN);
AddExhaust(th_main[0], 5, .5, _V(0, 0, -3.5), _V(0, 0, -1)); //EXHAUST location OF 1ST STAGE
th_main[1] = CreateThruster(_V(0, 0, 0), _V(0, 0, 1), 78272, ph_main2, ISP);//THRUSTER FOR 2ND STAGE ALONE
thg_main = CreateThrusterGroup(th_main, 1, THGROUP_MAIN);//
AddExhaust(th_main[1], 5, .5, _V(0, 0, -.5), _V(0, 0, -1)); //EXHAUST location OF 2ND STAGE