All things equal, what is the real speed difference in the XB21 series

[Darth VMAX]

What are we really experiencing? 1 mph, 2 mph...3 mph? Talking Prosport (to include SUB), 2+2 & the 2 seaters. Is there 3 4 or 5 mph difference from the fastest to slowest model?

 

[GotMyAlly]

That's probably a tough call to make without running both hulls with the same motor, prop, and driver when you're talking a difference as small as a couple mph.