Originally Posted by Jackster
The added mass of more line helps but should be coupled with enough line speed in a straight line path to really have the line want to feed back.
That is the key and what the illustrations that Silver put up are all about. I would even go so far as to change "should" to "must" as far as a"relatively' straight line tip path is concerned.
So how do you know if you are achieving a relatively straight line path and stopping hard enough? By the results. And the fastest way to know what the results are is obviously to look at them. You do not need to try to watch the actual rod tip to see if it's straight. It will never be perfectly straight, and it's too hard to see anyway. The results are what you are after.
So I would suggest standing sideways and casting horizontally. That way you can see your rod while casting it, and simply watch the loop from its formation to its turnover. You can see the results of a hard stop (really hard stop, extremely hard stop, ludricous hard stop), or a shortened or lengthened casting stroke as they are occurring while false casting.
You can experiment with stroke length, hard stop, soft stop , no stop, acceleration, force and, lastly, the haul, to instantly see their affects on the loop and each individual turnover. In short, you can "experiment" and see the results immediately.
As with all experiments, change only one thing at a time to see its effect on the outcome.
In other words, play with your cast but watch what's happening as it is occurring. If you have a short WFF line, use that with just the head and a few feet of running line out the tip. So you're only talking 36 feet of fly line. Put some yarn or small strip of rag onto a short leader first. This (the short head) will help you to "feel" the results that you are looking at. Don't be afraid to use a heavier WFF line than the one the rod is intended for during this process.
Don't go for distance, (at least until the end of your practice session
) go for quality and control. Jackster has said this repeatedly on this forum many times in many ways but all for the same reason. It is the only way that works.