Dave Jones

THE AR-25 was designed to be a novel entry in a contest devoted to models with a span of less than 72 inches and a wing loading greater than seven ounces per square foot. I had formerly designed several all-wing models for slope soaring to a similar wing loading and a size near two square feet of wing area. This gave me a good indication of how much a model of this type would weigh. Also, I had built an A-1 model of high aspect ratio which I wanted to emulate. I set down some design goals. These included a geometric aspect ratio of 20. A weight of 121/2 ounces was judged to be attainable. This left me with a wing area of 259 sq. in. This model follows general layout and construction methods of much larger models. I also intended to add winglets, a type of tip fin, to bring the theoretical aspect ratio to 25-hence the name AR-25. AR-25a incorporates several minor changes judged to improve durability.