Impressive shots but really not something to repeat. Props are seriously dangerous.
On a lighter note, the first run you doesnt look to cavitate too bad, most of the bubbles look to be from the exhaust. The second run looks to cavitate a bit - take it that's when he opened the taps? A bit of slip under hard acceleration is likely normal however.
Still, a good set of concept shots, but really do find a less dangerous way of repeating it if you must - I work just up the road from you and don't fancy sewing your arm back on!