The fiberglass wing tips used on the Acro II were just too modern looking for me so I built up these bows patterned from a Travel Air Speedwing. The spars were ordered longer than normal to allow for this. The tip ribs were built in place as you can see by the not yet installed gussets. They add about 12" to the wing span which will slow the roll rate, but I'm at the point where more roll rate is no longer a plus .
