Quote - I think tris are probably valid enough in a model like this one?

It's just when they're long and thin that they become an issue... am I right in understanding that?

All I know is that when I subdivided it into quads it fixed the problem...it did however make a bump outwards though. But I think that is due to the way the edges are at different "x-trans" positions...with the middle being further out and the side edges being in a little.