'A Bob' I was thinking the same thing but it matters none really whether the thread poster will return he has at least sown the seed for some to ponder over if they are at that stage of flying.
All these threads that get started & usually fizzle out provoke thought & can only be a good thing, that's how we learn, we ask, we inquire & we store little bits of info deep down inside our own CPU for another time:-)
It is said the art of flying is based on one thing, the ability to learn
Wmk2