In order to set a world record of any type, I believe, the FAI rule is a maximum WET weight of 5kg or 11 pounds. This includes the Maynard Hill et al crossing of the Atlantic recently. The closed course speed record of about 220+ mph (glider) was backed up by a run in the opposite direction, and as far as I know still stands. Apparently it was decided long ago that above 11 pounds a model ceases to be a model. If you want to set a record, you must be FAI legal; they are the sanctioning body of international aeromodelling.