Estimate of how fast will the Starship/Super Heavy be moving 5 and 10 seconds after liftoff?

Question

I am wanting to make a comparison of the expected initial seconds of the ascent of the Starship/Super Heavy compared to the similar time of the Saturn V ascent.

If this chart (from a NASA space math document) of the Saturn V Rocket Launch Speed and Height is correct, the Saturn V was initially moving at a pedestrian rate and was only at highway speeds after 10 seconds.

Is there an estimate of how fast the Starship/Super Heavy would be moving 5 and 10 seconds after liftoff?

Probably similar. If your thrust to weight ratio at liftoff is more than about 1.2, it means you didn’t bring enough fuel. — Russell Borogove, Jan 01 '20 at 01:25
The speed after the first second was 3 m/s or 10.8 km/h, faster than a pedestrian. But initial speed was 0. — Uwe, Jan 02 '20 at 15:13

score 3 · Answer 1 · 2020-01-02T00:43:33.143

3

Teslerati's September 2019 article states a T/W ration of 1.5 is desirable. Calculating an estimated table for the first few seconds of flight is trival, as one can assume the mass is constant (it isn't), and the direction is straight up

edited Jan 02 '20 at 00:43

answered Jan 01 '20 at 10:13

Should I assume the units are in m/s? – Bob516 Jan 01 '20 at 12:40
They are @Bob516 - I could redo it in furlongs per minute if you would prefer? – Jan 01 '20 at 13:00
https://space.stackexchange.com/q/39858/12102 – uhoh Jan 01 '20 at 13:05
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"Calculating an estimated table for the first few seconds of flight is trivial." Is it simply F=ma? If it is, I should've realized it myself. – Bob516 Jan 01 '20 at 13:06
Over the flight, @Bob516, the thrust increases (until it is throttled down), the mass decreases, gravity drag decreases, aerodynamic drag ... varies... - but for the first few seconds of a typical orbital launch vehicle those values are negligible – Jan 01 '20 at 13:36
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oops, it was a link off the OP's Wikipedia link @uhoh, good catch – Jan 02 '20 at 00:34
I've asked why 1.5:1 TWR is desirable for a reusable launcher. – Russell Borogove Jan 02 '20 at 03:02

Estimate of how fast will the Starship/Super Heavy be moving 5 and 10 seconds after liftoff?

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