Harold White's warp drive and OA

[Stardust]

The Pdf on the NASA site was taken down, but I still have his paper on my computer (it was freely accessible on the NASA site). This is the bit I found most interesting. His version acts as a FTL "booster" for a more conventional propulsion system. Basically, he seems to be saying that a fusion rocket that travels at *edit* .2c will be boosted up to 20c *edit*.

Interesting. Does the warp drive have an upper limit in how "fast" it could theoretically go, or is the 20c simply a limitation on how much energy is being used?