Originally Posted by
Pond Skipper
All the vintage scale hydro's running with the prop under the hull have quite a bit of down thrust.
Not true. Most run a flex cable drive rather than a solid shaft, just for the ability to adjust the thrust angle and depth of the strut. I haven't seen a newly built scale boat with anything else in years. As far as the older boats, most don't have that much down angle unless they were set up following directions in a kit that specified it as a starting point. Dumas boats were notorious for that.