ISP Conversion

[GregBurch]

I'm sure I've asked about this before, and no doubt the answer is staring me in the face somewhere obvious, but I'm not having luck in a quick search finding it (or, more likely, I'm too lazy to find it), but is there a relatively straightforward conversion factor to transform ISP figures from the Nerwtons and pound/feet figures in which they are normally given in the so-called real world to the metric used in Orbiter?

For some reason, I have a recollection that the answer isn't as simple as a single multiplier, but any help would be greatly appreciated.

GB

 

[Urwumpe]

Multiply imperial ISP in seconds or more correct lbf*s/lbm by 9.81 to get SI ISP in N*s/kg or the similar correct m/s for average exhaust velocity.

(1 N = 1 kg*m/s²; 1 N*s/kg = 1 kg*m*s/(s² * kg) = 1 m/s )