heirophant wrote:

John Doe wrote:
heirophant wrote:
John Doe wrote:
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?

How quickly do you wish to reach Xmph,

Five or ten seconds.

what would you allow for maximum efficiency of the propeller

Whatever type of propeller is best for taxing purposes.

and what are the limitations of your power output to the
propeller,

None. The propeller spins that whatever RPM is needed.

and are we rolling or standing start?

Standing.

I suppose the wind resistance of a typical light/small aircraft
on the ground would be in the ballpark.

Here we have come to an impasse. You wish to receive a set of
answers to a very difficult question

Granted, very difficult. Probably mainly because propeller power
is rarely used for land based vehicles.

unknowing that the quality or response, or any response,

I get what I pay for.

lies in providing a full set of the variables.

I jumped through that hoop last time.

Love to help you out but before I put forward any additional
effort, why is it that you need the answers.

Yes, and I would love to keep asking...

According to YouTube, a significant number of people have used
propeller power for pushing a bicycle. I wonder if any of them
have calculated their design, or if all of them have been simple
experiments. That is probably what I will end up doing some day.

But, somehow I doubt there is a forum for propeller powered
bicycles, lol, anywhere on the Internet.
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