some really good, simple and easily understandable info that should alleviate any confusions about these two beasties from Peter Charles.
the video says it all but i’ll add a few words on the noteworthy stuff first:
– first and foremost, keep in mind that Polyleaders are a ‘standard leader’ substitute and go on the front of fly lines made for ‘standard leaders’ whereas sink tips and their inherent weight are an integral part of fly lines made specifically for the use of sink tips.
in other words, sink tips are not part of the leader even if they’re commonly used and directly connected to the fly with a short section of tippet.
– what Peter means by ‘turnover force’ is simply the diameter or weight/mass of the fly line’s end or the tip/main body joining end in the case of lines made for sink tips.
to make that simpler (i hope !), a long and thin end such as found on ‘standard’ fly lines is too thin and light to transfer enough energy to a heavier and thicker tip. add to that a big and/or heavy fly and its easy to understand it won’t turn over at the end of the cast and if it does it will be a big sloppy, unpredictable mess. at best.
– although we’re only showed Airflo products, most other brands will be more or less the same. just be sure to check the tech specs on the package and even better yet, as products info is more detailed there, check out the company’s website to find what suits your needs.
– lastly, most won’t be using aerial casts with sink tip lines as they’re made for Spey casting and shine there but Polyleaders of any density are equally at home with both aerials and Speys.
‘nough said, enjoy !