I am amazed.

There is a principle called diminishing returns which says that when pursuing a goal, address first the factors that can most significantly effect the results, then the lessor factors until you finally come to factors that have such little potential payout, that they are hardly worth the effort.

Generally R/C model airplanes are so grossly overpowered that drag is not a major deterent to performance. However if your goal is to reduce drag, some factors offering the greatest payout are, geting rid of the nosewheel, cowling the engine, retracting the main lg, etc. Some lessor factors are, useing thinner wheels, adding wheel pants, fairing the fuselage-wing interface, etc.

The small differences in induced drag between the several wingtip designs (which are only apparent at high angles of attack anyway) are not really very significant.

A simple question asked and answered, yet the thread has grown to two long pages of impassioned posts about something in the category of "how many angels can dance on the head of a pin?".

Go figure.