ORIGINAL: C_Watkins
The
correct way is for the clunk to never fall forward, in my opinion.
Following that, you should never have a flexible enough clunk line to allow that to happen
(Because invariably, if it does go forward, it will stick there, causing you to scratch
your head for an hour trying to figure out why you're dying on uplines, afterwards.)
Well, in my ipinion it should definitely fall forward... especially with slow moving aerobatic planes. I have gone as far as making my own (much heavier) clunks.
For smaller models, I use the smallest, most thin walled clunk line I can find.
The clunk should ALWAYS follow the fuel IMO...
Of course, if the tank is too small, the clunk will never go forward... and you just have to pray...
Felt clunks can solve some problems too in the respect.