These were ballpark generalizations not specs, no need to split hairs.
On Sat, Mar 28, 2020 at 3:28 PM Henry Spencer <hspencer@xxxxxxxxxxxxx>
wrote:
On Sat, 28 Mar 2020, roxanna Mason wrote:
Titan SRB's had 2 configurations, 1.5MF and 1.7MF which had a half
segment added.
I think those may be *peak* *vacuum* thrusts. Isakowitz 2nd says Titan
SRB average thrust was 1.4Mlbf vacuum, and 1.4 is also the number that the
Commercial Titan Customer Handbook quotes. Several references, notably
Sutton 4th, say total *takeoff* thrust of a Titan IIIC was 2.4Mlbf, i.e.
1.2Mlbf per motor at sea level at startup. (That's also about right for
acceleration, which the CTCH shows as a bit over 1.5G at takeoff aboard a
1.5Mlb vehicle.)
But the vacuum thrust of an F-1 (an as-flown F-1, not even the F-1A) was
over 1.8Mlb -- Saturn V total thrust at the moment of center-engine cutoff
was about 9.2Mlbf.
Anyway, no argument on your main point: thrust was in the same league.
Which is no great surprise for nozzles with about the same exit diameter
under the same conditions, on not-too-aggressive designs with no exotic
propellants or other unusual aspects.
Henry