In September 2017 my wife and I flew from Minneapolis to Washington D.C. for my first visit to the National Air & Space Museum's Stephen F. Udvar-Hazy Center at Dulles International Airport. It was the trip of a lifetime and we spent two days at U-H and one day at the Main Museum on the Mall.
One amusing aspect of the visit was when I was viewing the Sopwith Camel just behind two Museum tour guides. They were wondering what the aft-facing little propeller on the right rear cabane strut was. One thought it might be an electrical generator, but there was only one line running down from it. The other thought it was a fuel pump, but again, there was only one line running down from it. I boldly stepped in and said I felt it was a wind-driven air pump, or compressor, which pressurized the fuel tank. They were dubious, but I googled it and showed them I was correct. They wondered how I knew this. "Ha!" I said. I've learned so much from WW1aircraftmodels.com!"
I think they thought I was weird.
Here's a link to my online Google Photos Album which contains some 418 images.
https://photos.app.goo.gl/oZigU8ZYcjuOVAS93The page will open up as large thumbnails, and if you click on the first one to expand it you’ll see a magic disappearing arrow in the right section of the photo. You can click on this arrow to advance or use the left arrow to go back without having to back out of the photo and return to thumbnails. You should then see captions off to the right, and if not, just click on the circled ‘i’ for ‘info’ at the top right to reveal them. Have fun!