Saturn V(rev 2), Saturn IB and Skylab

[deepspacecreeper]

more specs of the rocket? (delta-v, twr)

[sgt_flyer]

my Saturn V has a 1.33 TWR on first stage, with 1821 m/s of delta-V (with it's payload) a TWR of 1.51 with the second stage, with 2090 m/s of delta-v, and the third stage has a bit less than 1.42 of TWR with 2124 m/s of delta-v (the real number is a bit less, as Engineer redux don't count the payload fairing panels in it's calculations)

also, due to how the decoupling works here, you lose some delta-v at each separation - notably on first stage separation, as i recreated the ullage ring workings (first stage separate from the interstage fairing, with SRB's burning, then the second stage fire it's SRB's and jettison the interstage - then while those SRB's are firing, the second stage's engines are fired up)

whole rocket weights 687 tons on the pad.

the payload (CSM + Lander) should weight around 22 - 23 tons. (10-11 tons for the CSM, 12 tons for the Lander)

[Giggleplex777]

How are the ullage motors set up for the second stage?

[deepspacecreeper]

how do i put any other payload on top of it easily?

[sgt_flyer]

@giggleplex Between 2nd and third stage, there is braking srb's on top of the second stage, and ullage srb's on the third stage. The third stage j-2 engine was supposed to ignite during the ullage srb's burn."

@deepspacecreeper mmh - the best would be to 'Pick' the rockomax x-200 fuel tank of the third stage - this will detach the rocket from the payload. Then simply save the rocket as a subassembly (with 0.22) gor adding it below your payload, or delete the old payload, add a rockomax decoupler as the root part, and attach the rocket to the decoupler.

[Giggleplex777]

Between the first stage second stage.

[sgt_flyer]

Mmh, i don't remember if it was on this version or on one of later test versions of it, but it should work like this :

Srb's on the interstage fire up on decoupling, pushing the upper stages away from the first.

During the srb's burn, the second stage engines are ignited (spent enough time on making this fully hollow interstage ring )

Then, after the fairing srb's stopped burning, the interstage ring can be dropped.

[Giggleplex777]

Okay, so 4 (8, actually, 4 looks better) SRBs on the interstage, which simply gets jettisoned and and the S-II does not have ullage motors.

[sgt_flyer]

Thats would be more or less how the real would work the ullage is done by the interstage ring srb's