the airium line of kyosho (piper, edge and the curtiss p-40) and the hobbyking spad XIII 700mm used a 2 blade prop (kyosho item nr. A0905-06) that isn't available anymore.
here's an adapter and spinner that can be used with APC propellers.
[edit]22.03.2020: added only the adapter part for use without a spinner.
printed with 0.4mm nozzle and 0.2mm layer height.
The author hasn't provided the model origin yet.