The shg shadow was not meant for blistering high speeds.
It was a semi scale sports boat, not a race boat.Many people years ago tried to get too much speed from the little boats and they all came unstuck in that
the boats became far too heavy.
Ok when on the move, but on the point of sinking when stationary in the water !!!!
Although they were sold as a 3.5 cc boat, 3.5cc was realy abit too much unless built very light.
What you do have tio watch for on these boats is nose diving !!!! many were great submarines
phill