Using the same online payload estimator, and data from Isakowitz for the T-II stage 1:
dry mass: 4000
Propellant: 118000
Thrust: 2090
Isp: 278 (an average of sea level& vacuum)
Payload fairing: 500 kg jettisoned at 200 seconds
Cape Canaveral launch to 185 X 185 km, 28 degree inclination
Direct ascent:
Result:
Estimated payload: zero kg
95% confidence interval: 0 - 419 kg
-----------------------
Running the same thing again, but with an Isp of 288:
Result:
Estimated payload: 0 kg
95% coinfidence interval: 0 - 1036 kg
The 500 kg mass for the payload fairing is less than the actual 652 kg Titan II payload fairing.
Not included are the neccesary additional masses ofan attitude contro,k system and associated avionics.
So... no. Titan II first stage doesn't seem to be able to make it to orbit on its own. It would require a weight-saving program as well as more efficient engines.
