My second yacht was a John Spencer "Adrian" in ply. Mighty little 24 ft sloops for Auckland Harbour and beyond.
Mine was a little bit hotted up with a masthead instead of fractional and slightly taller rig if I recall correctly, which was offset two lengths of angle iron bolted through the keelson which in turn carried a half inch steel plate with lead bottom (mine had extra for rig/sail increase).
Man she used to love getting over on her chines and I reckon I had her doing better than hull speed a few times.
Original engine believe it or not was a Ford Anglia flat head motor. I replaced it with a Kawasaki pull start, air cooled light industrial with a 2:1 reduction gear behind it.
Plywood boats are great. They beat the hell out of steel or concrete boats.


The last plywwod built Diamonds. Ton of fun for $3,000.
yachthub.com/list/yachts-for-sale/used/sail-monohulls/diamond-y-w/300760