Hi NG...

I have a question for you propeller experts.
I´m making a reduction drive for my G-62 and I was thinking about making a 4:1 ratio. According to a prop calulator (no... not ThrustHP...) I found on the net the engine will be able to swing a 33,6x37 4-blade prop at 2000rpm... The program predicts that the max speed will be in excess of 70mph, but I don´t know how accurate the software is.
Does anyone know if a setup like this will work at all??? I´m not sure that a prop spinning at such low rpm will produce any thrust/speed at all... But then again its getting close to the size and rpm used on ultralights/paragliders, and it seems that they fly quite well...
The program I´m using is called "AeroDesign Propeller Selector" and is freeware...

Looking forward to your words of wisdom...