The fastest props for electric will almost certainly not be the same for liquid fuel motors. The reason for the difference is the rpm of the motors and their power bands. Liquid fuel motors have relatively low power at lower rpm and produce their peak power near peak rpm. Their peak rpm is in the 25,000-32,000 rpm range, so a lot of pitch is needed to go 100+ mph. FE motors have gobs of torque right off the beach and are turning well over 40,000 rpm through the traps - and some are close to 50,000 rpm. With these kinds or rotational speeds the pitch required is much less to reach 100+ mph.
To set the record at 123 mph Joerg used the same two-bladed design he'd used the previous two years, a very highly modified and custom-cast "1945". He changed to a custom 3-bladed prop (and perhaps to a different motor) and made the 133 mph pass which had a radar reading of 143. I did not see the prop so I cannot comment on its blade shape or pitch. Tim Higdon used a v900/3 design for his 104.9 mph record and made passes near 120 mph with a similar prop.
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