F-1 tunnel's my favorite subject. How far do you want to go with your old boat, what brushless motors do you have, an how fast, vs run time = esc. Some of these old tunnels don't handle vary well, if you try an boost their performance too much past what they were originally designed for. A nice conservative 3S set up(if the old out board can handle it) 2000 kv motor, 60 / 90 amp esc, 440 prop, should fetch plenty run time with speeds around low 30's, sounds about right for that old hull.
Disclaimer: Old ABS plastic can become brittle an crack easily. proceed with caution.
PROBOAT BlackJack 24", ShockWave 26"
MRP U-31, 3 tunnels VS1, MRP Bud Light, Dumas HS Sprint
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