LARSON DUSTER D-1. After several years preliminary study the Larson Agricultural biplane has been produced with the object of supplying a crop-duster which would be cheap, safe both from the point of view of flight characteristics as well as "crash survival" and which would be sufficiently rugged to stand up to the rough usage which the aircraft encounters in such work. The pilot is mounted behind both the engine and the load of 1,500 lb. of dusting material, while the top wing of the biplane gives him good turnover protection. The power plant is a complete package of mounted oil tank, engine and propeller, including 220-h.p. Continental R-670 engine used in the P217 Stearman, large numbers of which are obtainable cheaply as war surplus. The Jacobs 225 and the Lycoming 225 are offered as alternatives. The fuselage is of welded steel tubing fabric covered aft of the cockpit in the production model. The sheet metal wings have four panels all equal size with no centre section. There are no bracing wires. Fabric covering is used aft of the rear spar to save weight, The undercarriage is a tripod, split type, with standard Ford automobile wheels and brakes.