searching drawings or plans dempster vaneless

[Sidebikecomete]

Hi to all

After finnishing my lookalike aermotor windmill (see introduction) i am planning to make a dempter vaneless windmill. i still can not find any good plans or drawings to get dimensions from. If there is anyone out there who could help me to get any technical plans i would be very greatfull.
STEP or DXF or any kind of drawing is welcome.

Greetings from Holland
John