So you'll have a normal wing, and one with your tip on it. Why not include a Hoerner tip in the mix.
Met-Co-Aire says that its Hoerner wing tips "will definitely add to the performance of your aircraft." They say the Hoerner tips will increase aircraft range by 1 to 2 percent, increase rate of climb by 60 fpm, boost cruising speed by 3 to 5 mph, cut takeoff distance by 15 to 20 percent, reduce stall speed by 4 to 5 mph, and improve overall aircraft stability.
Do they perform? Met-Co-Aire's customers think so. Van Vliet sends a questionnaire to every customer, and 90 percent of the comments he gets back indicate a very high level of satisfaction with products and the company.