FORGOT TO MENTION THE OTHER DIFFERENCES WITH UCD #2, THIS ONE HAS INVERTED ENGINE(OLD UCD WAS SIDE MOUNTED), MANY PAGES BACK SOMEONE MENTIONED THE "WATERLINE CG". I WONDER HOW IMPORTANT THAT IS??? NO WHERE DO YOU SEE MUCH ABOUT THAT BALANCE POINT, BUT IT MAKES LOGICAL SENSE TO ME. IT MIGHT BE SORT OF LIKE A PARASOL WING PLANE, MOST OF THE WATER LINE CG IS BELOW THE WING, MAKING IT SELF RIGHTING. I THINK MY NEW UCD HAS A LOWER WATERLINE CG WITH THE ENGINE INVERTED.IT WOULD BE GOOD TO KNOW IF TRUE, TO GET 3-D IT SEEMS YOU NEED TO SET UP THE PLANE UNLESS THERE IS "ONE" OUT THERE THAT NEEDS NOTHING-I,VE SEEN AND HEARD GOOD THINGS ABOUT THE VISION.