Atomic vs LV-909

[foamyesque]

4 minutes ago, Sharpy said:

Did you use 10m/s for g or such?

 

Nope. You can check in the conversion between Ve and Isp. I suppose there could be cumulative rounding errors (the mass flow of xenon being the most likely culprit; I took the numbers from the VAB) though.

Edited August 19, 2016 by foamyesque

[Guest]

On 8/13/2016 at 5:02 AM, BgDestroy said:

What is better LV-909 "Terrier" Liquid Fuel Engine or LV-N "Nerv" Atomic Rocket Motor ??

	LV-909	Atomic
Mass	500kg	3000kg (6time more)
Trust	60kN	60kN
ISP	345s	800s (only 2.32 time more)

I trust both about the same, table don't lie.

[Red Iron Crown]

8 minutes ago, foamyesque said:

I suppose there could be cumulative rounding errors (the mass flow of xenon being the most likely culprit; I took the numbers from the VAB)

It's your EC production from the fuel cell I think, you used 72 EC/kg whereas the fuel cells are 80 EC/kg.

Large fuel cell:
18 EC/s
0.02025 LF/s = 0.10125kg/s
0.02475 O/s = 0.12375kg/s
18/(0.10125+0.12375)= 80EC/kg

[foamyesque]

11 minutes ago, Red Iron Crown said:

It's your EC production from the fuel cell I think, you used 72 EC/kg whereas the fuel cells are 80 EC/kg.

Large fuel cell:
18 EC/s
0.02025 LF/s = 0.10125kg/s
0.02475 O/s = 0.12375kg/s
18/(0.10125+0.12375)= 80EC/kg

 

Damnit, you're right. Miscalculated the burn rate (somehow used 15 instead of 13.5 units/h for the small fuel cell's 1.5 EC/s).

Edited August 19, 2016 by foamyesque