It is 7 degrees here in the mountains of WV, wintertime and my arthritis doesn't allow me to be very mobile. As a result I have had a lot of time on my hands and have been filling the time with researching lines and their effects on crankbaits. What follows is some of my thoughts that I would like to have validated or refuted.
First is the false advertising on most crankbait packaging. The diving rates given on the packaging of the crankbaits are either formulated by actually casting the crank or trolling. If trolling you will have a hard time getting the crank to the stated depth. When I have contacted various manufacturers they have responded with the same answer, that the depth ratings are calculated assuming .012 diameter line, trolled. None however bothered to state how much line they had out to get to the depth on the packaging. Anyway on to the line.
Mono the oldest and most popular type of line, from what I have gleaned still the standard that all cranks are rated from. The good news is that the 10lb test line that the manufacturers use to calculate the depth is .012, which means that using a quality mono you can actually use 12 or sometimes 14 lb test line and still be in the ball park of the depth rating. However mono has an open cell construction which means that the line actually absorbs water, which reduces strength and causes more water resisitance on the line when being retrieved. So I have pretty much concluded that using regular mono I will never actually get the advertised depth on the crankbait.
Fluro, the new darling of the industry and pros. As a disabled vet living on a fixed income, I have difficulty spending the money on this line. I have read that some test show that the flouro will stretch around 15%, mono stretches 25. Now before anyone has a knee jerk reaction the zero stretch claims made by manufacturers is a myth. Everything will stretch when there is enough pressure applied. I don't care if it is wire rope, braided line, flouro, mono, dental floss, a steel girder. Actually the faster the pressure is applied the less stretch any material will stretch before breaking. The slower and steadier the pressure is applied the farther the material will stretch. Anyway fluoro has approximately the same diameter as mono, but the reviews I've read all agree that the crankbait will dive a little deeper on flouro when compared to mono of the same diameter. This lead me to conclude that the closed cell construction of the fluoro results in less resistance on the line as it is retrieved. Therefore the diving aspect of the crankbait is not only a matter of line diameter but water resistance against the line. The reviews all agreed that flouro is slick, knots are little harder to tie and to get to hold than on mono, i.e. a regular cinch pulls through on flouro, so the reccommended knots are the palomer and improved cinch. So to recap the flouro gets the crankbait deeper because of the closed cell construction and its ability to repel water resulting in less resistance against the line, the fact it sinks is illustrative of these properties.
Braid the darling of the media turned into a sow's ear. The reviews on this product and crankbaiting are all over the place. Some people sing it's praises others declare that the braid destroys the action of the bait, pulls the hooks out, etc. However most agreed that 10lb braid will allow the crankbait to dive deeper than any other line, this of course is due to the diameter of the line. I have not found any site or information to confirm what I'm getting ready to type, and hope that someone here can validate. I'm betting that cranking with braid that has the diameter of .012 will result in the bait being more shallow than either the mono or flouro. The reason is again that the water resistance against the line will be more than either of the other two. Most braided line floats, and has an open cell construction which would result in a lot more resistance on the line when being retrieved.
This brings me to the last consideration, copoly line. The line supposedly shares the properties of flouro and mono. I'm hoping that the line having a closed cell construction has better crankbait potential than mono, not as slick as fluoro as therefore better knot strength, with better abraision than mono. What has been your experience with this type of line? Also do my opinions mirror what you have experienced on the water with these lines? Any comments will be appreciated. thanks