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Author Topic:  Lip connector crank angle.  (Read 1229 times)

Offline guppycatcher

Lip connector crank angle.
« on: July 15, 2014, 02:51:46 PM »


I'm helping one of my masterclass participants sort out a problem he's having with a lure design (his design, not mine!).
I thought the solution - and the accompanying picture - might help a few others out too.......

To cut a long story short, his crankbait had very little action and swam with a "head-up" attitude (if you're confused, attitude is also called angle of attack).

It swam like the lure in the bottom left corner of the diagram. He thought it was a weighting problem, but when he changed the weight balance of the lure it only improved things marginally.

Then he started playing with lip shape and size without any real luck. Next he changed the lip angle and got some improvement, but still not enough.

Here's how we fixed it: First, I got him to adjust the location of the internal weight until his lures were sitting perfectly horizontal at rest, or had a slight "head down" attitude. Then we adjusted the tow point upwards. For some of his lures just bending the towpoint up was enough, but for a couple of them we just couldn't adjust them enough. He re-made those baits with the tow point angled correctly and the problem was solved.

Once the lures had the correct attitude they also had a significantly stronger and more natural action.

Lures that swim with a "head down" attitude can be corrected by doing the opposite (ie moving the towpoint downwards if it's on the nose of the bait or forwards if it's on the lip). A head down attitude doesn't look as unnatural as a head up one and can even have advantages - some of my baits are intentionally designed that way, but that's another story.

Hope this saves you some trouble!

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