Struggling with final booster stage TWR

I’ve built a payload intended to take a scientist to Minmus Orbit to collect high and low space science -
Goo, Baro, Temp, Materials Bay and EVA Science project. Just one of everything that he’ll reset and collect while orbiting. With the command module, two bays, a small battery small reaction wheel the science bay, a Terrier engine, and fuel capacity for the vacuum Delta V to inject from LKO to Minmus and back home.

I am having a lot of trouble, without copying YouTube videos (so something must not have “sunk in” for me on all the ones I’ve worked through so far) figuring out a way to get this payload with approximately 2+ TWR on my third booster stage. The series I have been watching have recommended approx 1.33-1.5 TWR for pad liftoff, 2.0 for second stage and 2.1-2.2 for final stage. But fuel and engine combos just aren’t getting me there (whether on Vacuum or sea/atmospheric setting). I thought usually we wanted a Swivel engine as the final stage because of the gimballing, but It just can’t get me to that thrust to weight ratio. What am I missing?

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u/Litestreams — 5 days ago

Is more money put into Roth IRA through the front or Backdoor?

I am curious and didn’t find this information anywhere yet. Do you think that on an annual basis more money is flowing into Roth IRAs through the collective sum of folks using non-deductible IRA contribution - conversions, or folks under the income phaseout limits?

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u/Litestreams — 6 days ago

Can I set up a target and an intercept with range 6M to set my second geo-stationary satellite?

Hello, thought about this today. I know now from reading all the posts that launching 3 satellites at once and then sending them into orbits of different periods would have been better, but at this point I have one geostationary satellite in place and another one saved in a circularized LKO.

I was wondering after seeing that the space between satellite at geostationary 120 degree spacing is 5.999 if the targeting software in map view will show me the intercept distance and I just move the geostationary-burn (from LKO to AP out at 2.86MM) around the current orbit until it shows me an intercept distance of 6 million?

Edit to add: It definitely got me 'close enough' for the geostationary constellation. I created a maneuver node on my 72k circularized orbit for 672.4m/s to an apo of 2,863,342m with Intersect 1 and Intersect 2 both showing 6,000.3km - which is what I hoped I would see. After getting there and circularizing PE, I can see I am at 6.070MM separation, with both sats in an orbit of 5 hr 59 m 9 seconds. Did the same with the third satellite and now I have pretty triangle network from geostationary Kerbin satellites.

u/Litestreams — 8 days ago

Is there an In-game stock resource for determine atmosphere, high/near levels etc?

Or if I want to do this to plan my Science-collection orbits (e.g., next when I go for Minmus first visit) at high/near etc, do I need to just do the Science and figure it out?

I know that I can look it up on the Wiki… but i am wondering if there is a way to look it up before I plan my trips and my orbit AP/PE for EVA/Goo/Etc science. Or is this an Unmanned Probe exploration opportunity.

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u/Litestreams — 11 days ago

Removing part of assembly attached to ship

At 14:20 of this video, https://youtu.be/jW756GUltXg?is=JE3CYFVRbToprqAn , Mike Aben is tweaking the delta V of his ship by removing an upper fuel tank on 2 of his liquid fuel boosters and replacing it with a smaller one.

I have not been able to replicate this action. I have to drag the boosters off or delete them and rebuild them (usually spending 4-6 minutes trying to get them attached to the radial de-couplers).

Is there a key stroke or click, or am I misunderstanding what I see on the screen?

u/Litestreams — 12 days ago

I got my first, second, and third orbits. Unfortunately, only one de-orbited!

I am following Mike Aben's excellent 6 year old playlist. I was just able to get almost a perfect circular equatorial orbit! Which collected some science on an EVA from the materials lab and the other early-Science Mode kit, and returned on board, de-orbited and landed shortly after this photo. That was the ship 'Cain'.

Unfortunately, 'Eve' was my first 'successful' orbital attempt. As you can see, I had a lot of difficulty at launch and it is nearly a polar orbit. Furthermore, I thought maybe holding 'Shift' would let me zoom around differently in Map mode (like it does in the Vehicle Assembly Building)....so when I held Shift from the map I lit my engine and spent all 2s of de-orbiting fuel I had. Knowing about the 'push with your jet pack method'...but having never jet-packed before...I EVA'ed and let go of the vessel. Quickly googled to learn how to turn on my Jetpack and was quickly 750M away the ship. Tried a few times to get closer but just kept yo-yo'ing between 350-750M. At some point in here, I switched to the Space Center and lost the ability to revert to launch. Oh, and it appears you can run out of EVA thruster fuel so that happened also.

Long story short, sounds like I have a 'Rescue' mission and a 'De-orbit abandoned vessel' mission to do. I think it may be a few more videos down the playlist till I learn how to do that, and the wonky orbit probably won't make it easy without Mods but I am willing to give it a try!

u/Litestreams — 17 days ago