Charley,
Not a response to you, but rather to expand on your idea. Try what worked for us. A lot of farmers (some close to urban areas) have put considerable amounts of property into the Greenway program. They can't till the soil, or sell it for development. They can, however, lease it to an AMA sanctioned club to be used for a model airplane flying field.

We were able to lease several hundred acres, and lease it in blocks of 10 years, renewable. Works well for the farmer. (he gets more money) works well for the farmer. (he does not have to keep it mowed) works well for the Govrnment. The farmer is willing to renew the Greenspace program when the original one runs out. Works well for us. We have one of the best fields in the country. It's a win/win/win situation.
Bill, AMA 4720