This is a computer-generated image of a US Customs and Border Protection P-3 Orion with winglets.
Many of the same winglet designs tested on the C-130 were also evaluated for installation in the P-3 as the wing designs of the two aircraft are similar. The optimal design for the Orion winglet stands about three feet tall and adds about four feet to the aircraft’s wingspan. Preliminary CFD results indicate measurable drag reduction and a two to three percent increase in cruise performance and a roughly four to six percent increase in time on station or reduced fuel usage on a standard mission.
The P-3 has some unique issues. “Many P-3s have a number of antennae and electronic support measure equipment in the wingtips. All of that gear would have to be fitted in a winglet. The winglet itself would also have to be made of material that the sensor apertures could see through.”
Canadian Aviation Blog
Photo Source: Lockheed/Martin