Gemfan 40mm 4-blade props are more efficacy. This propeller could fit perfectly into 75mm frame with 1.0mm shaft. Like Beta75 or Beta75S.
Recommended frames that could fit these props...
This plastic canopy is still low enough to look down between the ducts to drop thru small slots or gaps.
Holds the camera securely and eliminates the chance of tearing a SMD component of the board...