Rebalance - Second go

[bszlrd]

I don't know how you calculated that efficiency. I'm using the useful deltaV (deltaV full, cargo hold is full of cargo) in my price calculation.
I'm calculating efficiency this way: deltaV/fuel mass. How much km/s you can get from a tonne of propellant (on average, ignoring the fact that the last ton of propellant gives you quite more deltav since you don't have to accelerate that much propellant when you are using the last drops).
Thrust isn't really relevant here in my opinion, since it doesn't matter how much time you need to reach a given velocity in most cases. It would count if you are able to accelerate until midpoint of the trip though.

My calculations:

Code: Select all

Efficiencies: (full, empty)
Xylophyis: 756, 1880
Lunar shuttle: 94, 164
Pumpkinseed: 987, 2274
Amphiesma: 326, 776
MolaMola: 141, 404
Sinonatrix: 217, 458
Kanara_civ: 150, 267
Natrix: 52, 142
Wave: 244, 585
Deneb: 52, 157
VentureStar: 24, 67
DSMiner: 2, 9
Nerodia: 5, 25
Malabar: 3, 9
Vatakara: 3, 9

Xylophis is actually quite fuel efficient.

[Nyankosensei]

I do not want to raise any controversy, is only a report of fuel need for 1e6 power thrust to 1 Tons of mass, the last value is the report of deltaV/fuel need for 1e6 power thrust to 1 Tons

For example i use FastAsLight cheat from Fluffyfreak repo and i don't need hight deltaV Values and i have balanced values by Manufacture of the ship



But do something like that with the actual insystem travel is not possible

Surely that is not the better way for calculate it but in my ignorance that is the fast way for have some values

[bszlrd]

Don't forget that deltaV already takes mass into account.

[Nyankosensei]

Don't forget that deltaV already takes mass into account.

Yes but DeltaV/DeltaV Kms are proportionally, i can change the values but the result is always the same, my only bad is calculate with fuel weight too but probably the differences are relative or nothing

[Nyankosensei]

I have do a big mistake, fuel compsumation si not relative to power thrust but only to mass

Here the falue of DeltaV for 1 Ton of mass (i have used all empty values)

[bszlrd]

I don't understand that deltaV to 1T value you have there or how you get it.
It's the deltaV of the ship with 1t of cargo? (what's the point then?)
It's the deltaV of the ship with 1t cargo + the remaining capacity filled with water? (still no sense to me)
It's the deltaV of the ship if it's hull was only 1t? (even less sense to me as a benchmark)

[Nyankosensei]

If you use DeltaV/fuel for get a value of fuel compsumation you can't get the real value becouse deltaV have mass dependency, but if you use DeltaV/Fuel*Hull you get the real value to 1T of mass of the fuel efficency.

[bszlrd]

Yes, DeltaV/propellant is just s rough estimate, or statistic if you like. I did said that actually. It basically tells you, roughly how much speed you get from a ton of propellant on average.
DeltaV/Fuel*Hull seems quite redundant for me, since you already took mass and fuel into account when you calculated deltaV. It's like measuring mileage projected to the weight of a car instead of how much distance you can cover with your fuel (liter/100km for example, or 700km with 50l gas) or how much stuff you carry how far.

[Nyankosensei]

What i want calculate is the performance of the fuel by the ship for have 1 value for compare with other ships, after i can compare fuel performance by manifacture and age of the ship, for do that i have take DeltaV Max(without fuel)/Fuel Mass*Hull, really i don't know how is calculated DeltaV, with DeltaV formula is possible to do a better estimation

[bszlrd]

Calculating a rough deltaV is actually quite simple even if it's rocket science. Wikipedia or Atomic rockets somewhere on the middle explains it nicely, if you want to dig into that.
In my opinion the deltav/1T method isn't really a good benchmark because you don't have much control on ship mass, and you already know your deltaV which is the most imoprtant thing that affects your travel times. It's true that propellant mass is also taken into account when you are calculating deltaV. DeltaV/propellant makes more sense in my opinion because you have to pay for the propellant (even if it's almost freely given to you upon landing, and you still have some control by buying extra propellant) but you don't pay a dime after the mass of the ship repeatedly. (how much bang for your buck)