Reducing the amount of fuel an engine requires.

[spacetackle]

Hi everyone,

I am trying to modify an engine, so that its thrust remains the same, but it requires much less fuel per/second to achieve the same result.

How can I do this?

is it just a matter of changing the propellant ratio?.. and if so in which direction?

 

Thanks for your help!

Edited April 1, 2016 by spacetackle

[nli2work]

lowering the fuel ratio should work.

[komodo]

Wouldn't the ratio just be that? Isn't this an ISP knob to turn? It goes directly to efficiency, I think. How much fuel for a given thrust, etc...  

That said, I don't know for certain, but I would check that number as well. (It'd be the thrust curves... Are they marked atmospheric curves in engine modules? I think that's them...)

[nli2work]

oops. yeah you are correct. 

Increasing ISP in atmosphere curve {} is the way to do it.

Key= # % specifies ISP% at ATM #. Key = 0 300 means 300 ISP in vacuum. Key = 1 180 means 180 ISP at sealevel.

thrust curves specify thrust based on velocity, for atmosphere engines.

Edited April 1, 2016 by nli2work

[spacetackle]

Thanks for your help!

I have tried toying around with ISP as well as the ratio, but just can't seem to get the result I am after.  Do fuels have values attributed to them in a different location, that may be affecting this? or is the rate at which the fuel burns exclusively determined by the the engine cfg?

I will keep experimenting.

 

EDIT: after much trial an error I got it working. I did indeed need to continue playing with the ratio and isp until it was at a workable value.

Thanks again!

 

 

Edited April 1, 2016 by spacetackle