Hi Robert,

When you look in the speed list of the various forums, you'll see that only a few monohulls reach a 100 Kmh, this needs very favourable conditions (little to no wind, small ripples on the water, no waves) and a well set-up boat to get that fast.

Also a crash at such speeds usually creates havoc in the boat...

The Toysport site mentions a LMT (Lehner) motor, most likely a brushless one, very good and very expensive, as you'll need a special controller for brushless motors.
Check it out at the LMT website.

-Is that even possible with battery ? or would nitro then ? -

The fastest modelboat in the world is electric (192 km/h).... nitro is slower, as the brushless motors can rev higher.

Regards, Jan

P.S.: where in Denmark do you live?