Yes Charles there is a little catch 22 involved but it can be minimized. Getting some instr in motorglider is not really necessary. Any power plane will do. Really the essential skill involved is field selection and evaluation. Flying in a power plane at say 1500 ft agl will give a guy the perspective he will be seeing when confronted with an outlanding. A guy can get experience making a field selection and evaluation and simulated approach then both go up and relook it over to cat h what he might have missed in an actual landing and/or then drive over there and apraise that same field from the ground. Thats what an old timer did with me when I was a kid preparing for mu first xc.