The"EX" wing conversion of the prototype is complete and flying and the supplements are being sent out with manuals so that either the EX or SP version of the Vision may be built. The original intent of the Vision design was to create an aircraft that was easily and economically constructed by first time builders. One of the prime advantages of a "plans built" plane over that of a total kit plane is it's ability to be modified. The original concept was one of two somewhat, not radically, different wing/tail combinations that would give the builder maximum utitlity and suitibility to purpose. From the earliest stages the "SP" (Sport) and "EX" (Extended) were planned but the opportunity to build both was not available so the decision was made to construct the first planes with the SP wing and base the construction manuals on that version. Since the introduction of the plane it has become apparent that many people who are beginning their Vision projects will be better suited to the EX wing and the prototype aircraft was modified to test tail/wing compatibility in that configuration. The SP wing is primarily designed for lightly built aircraft with conventional gear (taildragger) that are generally flown at low altitude. The EX wing is a higher aspect ratio wing and is better suited to high altitudes, heavier people, and gentler handling. Although there will be some speed penalty below 4000 feet msl the higher aspect ratio should prove to give improved performance above 4000 feet. As a margin of safety all the design speeds for the SP wing version were based on the EX wing from the beginning so there will not be a different set of "V" speeds for the EX wing and confusion will be avoided. The addition of the EX modification will add approximately 30 lbs to your empty weight while adding 150 lbs to the allowable gross. This means that aircraft of 120 hp and above have an allowable gross of 1600 lb with the EX wing and 1450 with the SP wing while those under 120 hp have an allowable gross of 1500 with the EX wing and 1350 without. +6/-4 g rating is still at 1250 lbs as always for all configurations. A basic VFR aircraft with a 215 lb (Continental O-200 type) engine should weigh in empty at around 850 lbs well built. If you add heavy instruments, engines, upholsteries, or sloppy construction you will lose utility. Watch the weights but the EX wing option does give more room to customize. This wing combination changes the wing area to 96 sq feet and adds 4 feet to the span. The spar can still be built in sections so that construction can continue in a two car garage.