I've always thought the purpose of countersinking was purely aesthetic. The main reason being to have a smooth surface once screwed, riveted or otherwise. Is this the case or is there some added bonus of strength?
I'm asking because I did my rivets on the read spar of the VS last night. Onbe of the previous parts I had countersunk was the rear spar doubler. Here's a picture from someone elses log;
This particular piece gets riveted to the rear spar and wouldn't be visible on the final build, it also doesn't have anything directly butt up to it. Only thing I could think of is they wanted to reduce the rivet length, so they had it countersunk...
I'm asking because I did my rivets on the read spar of the VS last night. Onbe of the previous parts I had countersunk was the rear spar doubler. Here's a picture from someone elses log;
![IMG_20141224_212704.jpg](/community/proxy.php?image=http%3A%2F%2F1.bp.blogspot.com%2F-sceYs7l34aM%2FVJugaLOZ8XI%2FAAAAAAAAchQ%2FgpXAgavdcQU%2Fs1600%2FIMG_20141224_212704.jpg&hash=f4901495fb10afcb581f272b07a14f81)
This particular piece gets riveted to the rear spar and wouldn't be visible on the final build, it also doesn't have anything directly butt up to it. Only thing I could think of is they wanted to reduce the rivet length, so they had it countersunk...