Balsa wood narrow-tank duck model made by Stephen Salter circa 1974 with aluminium-alloy rod through centre. Approx 1/100th scale. Used with external dynamometer which provided a variable load for the model to work against so that it’s power capture performance could be assessed.
One of the very first ducks.
Tear drop shaped composed of 9 sections wood together, 2 white metal rods, metal bracket with 2 screws and nuts, varnished.