Its a 2 part question.
I saw a drone prop on ebay that's a tractor turning clockwise.
My question will it push turning counterclockwise or does it have to be engineered as a pusher not a tractor?
The industrial fan is a 30" 4-blade powered by a 5hp 3phase elec. motor turning direct drive as you said 1750rpms.
I was going to put the motor on a compressor.
Thought I might use the fan to build a fan drive for frogging. I have a 16hp honda horizontal shat which of course turns CCW.
The fan has to turn CW to push.
I have only found one possible solution I have found is the Comet Gearbox which is for go-karts.
It is reasonably priced at $260.00
http://www.mfgsupply.com/218390a.html
Along with the Comet torque converter $150.
http://www.gokartsupply.com/4044seri.htm#44 SERIES
This could give me a way to go backwards when frogging irregardless of what prop I use.
I know it looks complicated but Do these components look like they could be setup as a reduction drive with reverse?