Alright, from my understanding the fast you travel , the more your will get under the influense of Relativity
The effects by relativity can be calculated by R = 1 / SQRT(1 - V^2 / C^2 )
Now from my understanding effect 2 merely optical effect for external observers and effect 3 only has effect on the aging of the crew and vesel. (making the crew and vessel age slower)
Effect 1 is the most important one because it prevent traveling faster than speed of light as mass becomes infinite.
For KSPI-E Daedaul engine I want these relaitivy effect to effect space travel with the Daedalus engine.
As I see it, this can be achieved by making to overal mass of the engine higher or by adjusting the thrust and ISP of the Daedalus fusion engine.
Seems to me option 2 is the easiers to achieve, as you need to only adjust THrust and Isp by Ralatively effectily making the engine slower untill it becomes close to zero.
However this would only affect the engine performance and not anything else.
My Qyestion is, should the increase in relativistic mass also have an effect other operations, like rotating the ship by RCS?