heirophant heremypants hushmail.com wrote:
John Doe wrote:
Is there such a calculation/formula? How can you tell what
propeller to use, how fast it should rotate, and how much
weight it can push along the ground?
Specifically... I would like to tell what sort and size of
propeller rotating at what speed, in calm air to push 100 or
200 pounds on smooth and level pavement with zero rolling
resistance to about 20 mph.
Far too little information to arrive at an answer. Could you
tighten the variables a bit? 
What other variables do you need?