Abstract. It has been noted for some time that when using very high value speed arts, all ships tend to converge to roughly the same maximum speed. Detailed testing has revealed that this is indeed the case. Maximum ship speed in the astroflux universe is +650% +/- 15%.
Method. Timed runs were done in Sarkinon between the warp gate and the furthermost recycle station in the elite zone. Each run was done at constant speed. A run-up was allowed to get the ship upto full speed and then the timer started as the ship passed the start line. All runs were done with a ship with lv6 engines. After each run the ships speed was increased by +50%. As the only ships avaliable were Assassin and Explorer, the lowest value tested was +16% speed (The assassins base speed). The highest value tested was +920% speed.
Measured Time vs Ship Speed Bonus
Red line in the graph is the expected value. We see the results are consistent with what we expect until we reach the +600% to +700% range, at which point the travel times suddenly flatten off.
The effect may not look very pronounced, but it is clearer if we use our measued travel times to calculate the actual observed velocity. i.e:
Ship speed bonus vs Actual calculated Speed.
Now we see quite clearly that ship speed hits a cap around +650%.
Conclusion. Ship speed is capped. Gosh. If you can reach these speeds in your main gun boat, then its time to officially bury your Explorer.
Acknowledgements. Thanks to Jes for repeatedly racing back and forth across Zergtilin to verify that Assassin and Explorer do indeed converge to the identical speed, despite the Explorer having a significantly larger calculated speed.