This is a reproduction copy of a real propeller of a vintage CO2 slowflyer engine DP-03.
Actually it will suit any slowflyer aircraft model not only CO2, but also rubber powered free flight models and electric RC slowflyers
There are pictures of how it's been reproduced from a real vintage DP-03 propeller
There are two versions of propeller submitted:
screw0.STL - version with improved flying characteristics, final weight 5 grams
screw1.STL - an original copy of DP-03 propeller, final weight 4 grams
Propeller was tested on a real-life CO2 model, it flies! :)