RE: any answers to finding lost airplanes?
If you have made a mental note of where the plane went in (perhaps you had the presence of mind to lay your transmitter down in front of you with the antenna pointed in the direction it crashed?), you can then use an orienteering compass to establish a straight line of search.
You can pick one of these up in the sporting goods section of your local Wally World for about 5-6 bucks. It has two arrows on it. You to set an adjustable arrow directing you along the path you want to take while holding the compass so that the magnetic arrow is always pointing north. The trick is to set the adjustable "path" arrow on the compass correctly, then start out from where you set it, never straying from that line of march.
You almost surely will have to cut through on an angle with the corn rows in order to maintain your direction accurately. Pay no attention to your "gut feeling" of what direction to go! This should take you within 50-100 feet of the model, which may be on either side of your line.
It helps to have a couple of guys on each side of you following along, but spread out some, checking down the rows as you go. Without the compass, we never would have found my last "corn field landing" location.
Good luck, Dzl