SSTA delta-v minimum requirement

[d4s_over_dt4]

What is the amount of delta-v it takes for a SSTA to go from the surface of a planet to the surface of another(so as to refuel),so that the ssta is not stranded on a planet?

source:https://ksp-visual-calculator.blaarkies.com/dv-planner (idk how to take into account the inclinations of the celestial bodies without doing the calculations by hand,so the result is lower than what it should be in some cases.Inclination mainly affects the capture burn of planets without an atmosphere,because it affects the relative velocity.It also makes trips potentially MUCH lengthier.)

Departures:
Moho(->eve->gilly):2.373
Eve(->gilly):5.014(with a propeller,without using the hardcoded data from the delta v map that just says "8" without considering,like,anything.its not supposed to be used as ascent guidance anyways.Not recommended to be on with an ssta(special planets  special crafts))

Gilly(->eve->kerbin):0.335(although in practice you would use like double that for going to minmus,since you do have enough delta v for that and minmus is just a better fuel depot to take off from)
Kerbin(->minmus):1.261+whatever it takes for the airbreathing engines to lift the thing to orbit(rapiers can do like 1.3,so in that case you are looking at ~2 vacuum delta v and enough air breathing delta v)
Mun(->kerbin):0.851(again,in practice you would use like 0.2 more than that for going to minmus)
Minmus(->kerbin):0.340
Duna(->kerbin):2.006(again,spend the extra 0.35 for minmus)
Dres(->kerbin):1.735(+0.35)
Laythe(->jool->pol):1.345+whatever it takes to LLO
Vall(->jool->pol):1.790
Tylo(->jool->laythe):3.120
Bop(->jool->pol):0.619
Pol(->jool->kerbin):0.996(+0.35)
Eeloo(->kerbin):1.941(if not want to do jool assist which has rare windows)

Arrivals:

Moho(<-eve<-gilly):3.295
Eve(<-gilly):0.227
Gilly(<-minmus):0.677
Kerbin(<-minmus):0.340
Mun(<-kerbin<-minmus):1.062
Minmus(<-kerbin):1.261
Duna(<-kerbin<-minmus):0.497
slingshot starting with minmus then kerbin then eve:0.434(gravity slingshots are very benificial for dres,jool,and eeloo if you can start from LKO or LEO(eve),because their orbits are spaced so apart.)
Dres(KEDD):+~1.2
Laythe(KEKKJ):Free after that slingshot
Vall:+~1.7
Tylo:+~3.3
Tylo(<-Pol):3.426(like 0.4 less than the assist route)
Bop:+~1
Pol:+~0.8
Eeloo(KEKKJE):+~0.86

Conclusion:If your ssta does not need to land on places without a surface and does not need to take off from those places or eve,it needs ~3.5 vacuum dv.If it doesn't go to moho or tylo either,it needs ~2.
 

[d4s_over_dt4]

(also this post assumes aerocapturing,enough parachutes,and no losses.)

[d4s_over_dt4]

CORRECTION:Rapiers work at speeds much much higher than 1300.
Here's four working at >1500 and nearly melting some control fins!
https://imgur.com/a/M5gRNl1
A closer inspection revealed ~1570m/s of speed and less than 30 degrees until the melting point of the fins,before my emergency pull-up.The craft eventually got to 1600 m/s before the rapiers dropped to ~90kN and I turned on the nervs.
(reminder to self:next time raise the altitude earlier than nearly melting the control fins,that or make them shielded by the front wings(much higher thermal mass))

(the craft is HEAVILY shielded.Everything but the wings,landing gear,and intakes are shielded.(The intakes are attached to the engines,which are attached to the engine plate that also shields the root fairing.Meaning that the fairing and the engines are shielded,but NOT the intakes.(the places you are supposed to attach engines on the engine plate are magical and remove all drag from anything directly attached to them)This scenario,where rapiers accelerate to such a speed and melt stuff,doesn't really appear when you don't do part clipping and weird occlusion tricks.)

Edited March 26 by d4s_over_dt4

[Vanamonde]

Did you get it working? 

[d4s_over_dt4]

49 minutes ago, Vanamonde said:

Did you get it working? 

Which one?
The SSTA DV chart:Turns out the calculator already uses inclination.What it doesn't use is the idea of aerobraking only removing energy and decreasing eccentricity.There are incorrect DV stuff when returning from other places,to aerocapture at kerbin,to go to minmus.The difference is usually small,though,as the orbits are usually quite eccentric.
SSTA 1(the piston one):Nope.On the next day I remade it using pretty much the same principles but I also figured out I didn't need a piston after all.There are radiators that work in fairings(they are also lighter),fuel cells and rtgs were already required for mining on the outer planets,the two planets that would benifit from parachutes also have low gravity(you might want to use the oxidizer engine on duna),and the landing gear wouldn't fit in the fairing anyways.
SSTA 2:Yep!

Wait,actually after your question,I got reminded that no,the front control surfaces were not actually shielded thermally by the delta wings.They went up to much higher temperatures than the delta wings,suggesting the delta wings did not shield them.
Mb I need to go read how thermal occlusion works...

(I'm planning on making a heat shield wing SSTA 3.I would have to figure out how to change the center of lift in flight,because the center of mass is going to change quite a lot(this is an ssta powered by things other than xenon,nuclear power,reaction wheels,and the wraith of the kraken(https://www.youtube.com/watch?app=desktop&v=wOlMlRf9qvo&t=1s).the COM is going to change.at the very least,releasing or getting a payload would change it quite a lot.)

(I already know that you could roll in the roll direction to fix some ascent rate problems,but i'm not sure in what cases that works.(SSTA 2 has the center of lift behind the center of mass with any payload and fuel load.That's better than having the center of lift occasionally ahead and causing problems,but I don't think that's the first thing to worry about on a craft with a ridiculous LD ratio))

If you're talking about SSTA 2,let's go to that topic to talk about it ig (iirc something in the rules about not hijacking topics or smth)

 

Edited March 26 by d4s_over_dt4

[swjr-swis]

On 3/26/2025 at 11:09 PM, d4s_over_dt4 said:

I would have to figure out how to change the center of lift in flight,because the center of mass is going to change quite a lot

Why? Design it from the payload bay outward, with fuel balanced on both ends of it, and you can get to a 95% solution with very little tweaking required on the end result, or acceptably small CoM shift.

But if you really have to change CoL:

• Include a set of control surfaces as part of the wings or winglets, disable all control authority, and bind 'deploy' to an action group to shift the CoL when needed (or use the deploy angle slider/value for a more hands-on adjustment to live flight situations).
• Pack a few lifting surfaces in a service bay, and open/close the bay when you need the CoL adjustments. With some proper occlusion of the inner nodes of the bay, you won't even have to suffer any drag penalty from the open bay.

[d4s_over_dt4]

19 hours ago, swjr-swis said:

Why? Design it from the payload bay outward, with fuel balanced on both ends of it, and you can get to a 95% solution with very little tweaking required on the end result, or acceptably small CoM shift.

But if you really have to change CoL:

• Include a set of control surfaces as part of the wings or winglets, disable all control authority, and bind 'deploy' to an action group to shift the CoL when needed (or use the deploy angle slider/value for a more hands-on adjustment to live flight situations).
• Pack a few lifting surfaces in a service bay, and open/close the bay when you need the CoL adjustments. With some proper occlusion of the inner nodes of the bay, you won't even have to suffer any drag penalty from the open bay.

Thanks!
I already solved the problem before I saw this post,and I just used regular control surfaces and made the craft point prograde using SAS.

Heat shield wings normally have 45 degrees of wing inclination,so it is very appropiate to just point prograde.If the ascent rate is too high,I would roll the craft to cancel some out.