RC Airboat World was a really great forum to have been a part of. There were a lot of quality guys that posted some fantastic boats and the build logs that got them there. Surely a loss wealth of information. I had referred several aircraft guys to Chris and his forum to get SI3 kits and plans in several parts of the world.
Crispy sold me an engine from one of his 1/4 scale SIs and in the box was a couple of these stickers. I stuck one on my lunchbox a week before I got the sad news about RCAW.