JvR designed the B and C with all external joints after a favourite loco developed a leakk internally which try as he might he could not repair. He ended up re-boilering the offending loco. I know this as JvR is a former boss of mine and he was one of two who got me into the live steam hobby.
Sam E > John designed the > type"C" to overcome the percieved problems of the other two. This is dead > easy too, all brazed joints are external ( = can be fixed if it leaks!), > and is widely used including by Aster. >
