The Sniffer-PF (for Park Flyer) is the same as the original free flight design with an instruction Addendum by Harry Stewart, and a complete hardware package for converting the model to electric RC.  Model has a 30″ wingspan and 139 sq. in. of area.  The prototype weighed 5.3 oz. giving it a 5 1/2 oz per sq foot wing loading.  The Sniffer-PF has proven to be a very stable flyer for a bit of relaxed nostalgia. Originally flown with EPU-3 brushed motor (no longer available) recommended power today is the HC-2208 brushless (M-112) and 2 micro servos (HS-55) are required.