Judging by this EAA page
2010 - 06/18 - Fokker Dr.1 Triplane, the Dr. I in the photo is from the Vintage Aero Flying Museum in Colorado
Lafayette Foundation
Looking at the photos on their website, you will see that the wingtip skid is exactly like the one in Noyade's post. It must be just a trick of the light that makes it look so bulky in the P51 photo.
Surprisingly, it has an IO-360 rather than a radial. The range is quoted as 125 miles, which must have made for an interesting cross country (871 miles).