Titan III Research And Development (1967) 

"A main engine that was air started in flight after SRB burn out." Actually the first-stage engines started 10 seconds before SRB burnout (The engines took three seconds to reach full thrust) when the thrust from them started to taper off. " 3 stages. (4 if you include the SRB's as stage 1)" The SRBs were referred to as stage 0.

Maximum launch rate?

@@maelialvess6553 I think he's referring to how the guy is pointing at nothing in particular with his pencil. Or pointing at the rocket engine on a low fidelity plastic model as if there's something specific there.

"Those things cost too much. Let's buy them from the Russians. What could possibly go wrong?"

Titan-IIIB had the Agena in place of the transtage, and no SRB's.

@@leechjim8023 IIRC the last Titan-IIIB was launched in 1988.

@neo Which one?

@neo Most were used on missions, though a few were put on display. We have learned a lot since then, so no sense going back to an antique design. Moving forward!

The Saturn five is huge and bad ass but it was not triple core but what about the delta for heavy?

@neo Silly statement. I was there, remember? I've studied the rocket inside and out. Keep in mind that we did not know how to build big rockets back then. It was a learning experience, but we've learned so much more since then. It was quite difficult to maintain combustion stability in such a huge engine as the F1, and that's why we don't build them big like that anymore. But if I were jealous would I have two Saturn 5 launch videos on my YT page? Happy flying! ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-YJ3LiEC6wtY.html

@@deankruse4491 Saturn V didn't need boosters, hence 1 core. The triples only LOOK cool. They aren't superior. Just easier to manufacture due to smaller diameter rocket bodies.

@Nature and Physics That is correct however both the Saturn IB and the Saturn V had applications beyond the programme. If NASA hadn't have had its' budget severely curtailed in the late 60s there's a LOT more that would've been done with them.

@Nature and Physics Then how come I have a Douglas "SATURN IB/SATURN V ROCKET PAYLOAD PLANNER'S GUIDE" reprinted by Periscope Film LLC?

@Nature and Physics If you don't believe then check this out: periscopefilm.com/saturn-ib-saturn-v/ I've NASA technical papers discussing the use of the Saturn V to launch heavy interplanetary probes called Voyager (They had nothing to with the Voyager programme for a grand tour of the outer planets).

The first Titan IIIC did reach orbit with its inert payload. The first Titan IIIA fell short of orbit, but not by much, and due to an easily-remedied Transtage problem (the Transtage shut down a few seconds early, but the vehicle achieved 95% of its test objectives), and: The vehicle's achievement is illustrated by the fact that five Titan IIIAs were built, but the next three performed so well (not just reaching orbit, but accurately delivering multiple-satellite payloads to their planned orbits, and making triple restarts [which hadn't been done before]) that the fifth Titan IIIA mission was cancelled. That Titan IIIA was sent back to Martin to be converted into a Titan IIIC core vehicle, as which it was later launched.