Thanks, alec_t
Viscosity of water is 1 and density is 1 at 20°C; Cross section of spear is 1cm diam = 0.0000785 m^2 cross section.
There is a constant factor for 'shape' for sharp conical point I cannot find. It can be assumed as optimal 1, for minimum drag, I believe.
Before jumping to electrical, would like to know the initial velocity and kinetic energy, and if the formulas posted are not enough, would like to learn which are proper.
I have no simulator, and probably no brain to apply it if I had such software.