I sent the following E-mail out to the AWH List (email@example.com) one week ago. Below are some of the excellent responses I got. I think hugh's recommendations look the best. The first one in his list uses a prop that is about 20" in diameter. All recommendations I think would work.
Offered by Mike.
Does anyone know where to purchase or how to make a lightweight portable windmill? Needs to produce enough electricity to recharge hand held ham radios, and LED flashlights for a party of 3 to 10. Estimate about 10 to 20 watt-hr over night (12 hr period) should be plenty for average wind conditions. Needs to be light enough to backpack it and supporting structure into primitive areas. Needs to be durable enough to work for extended periods of time. Needs to be relatively easy to put up. Assume average wind conditions without trees or above the trees. Assume one can chouse to camp where the wind is blowing at least one out of each three-day period. Assume moving during the day, and near continuous cloudy rainy weather.
A lightweight hand crank generator could work as an alternative. This is, if the cranking time does not exceed say 10-20 min/day. Don't know what is available and which approach would be best. I am thinking if moving around a lot, the hand crank generator may be best. However, if camping in one spot for a while the windmill might be best. Any ideas on where to get these things and what will work best?