Thread: 360 and the death of si/di

Hey Vik, what does it look like on those images when all that is at the 2:00 position off the bow 75-100 feet from the boat?

Originally Posted by rnvinc

That's a very good description Vik ....well done....

Your "swingscan" ...as you call it...is definitely very interesting.....

Are you using a Down imaging unit with 1 down image crystal on a certain degree angle from direct vertical to garner the images that you have posted...??

Rickie

Rickie,
yes, I posted the images using Down imaging unit with 1 down image crystal on a 40 degree angle from direct vertical:

http://www.crappie.com/crappie/fishi...b-346c-di.html

I think you will be seprised, but I used two DI transducers with that tiny unit Humminbird 385 ci DI as well, and had seen both sides in one ice hole:

Originally Posted by Stymie

Hey Vik, what does it look like on those images when all that is at the 2:00 position off the bow 75-100 feet from the boat?

You can see on screenshots above that it can get images 40m from boat, or 120 feet using that technick. I got imagies 60m away of boat, or 180 feet. Humminbird 385 is small, but it is powerful -4000W.

Is the 40° angle from direct verticle a critical measurement in this application or would you adjust that angle according to the water depth...??

Rickie

Originally Posted by rnvinc

Is the 40° angle from direct verticle a critical measurement in this application or would you adjust that angle according to the water depth...??

Rickie

It depends on which frequencies I am going to use it: if it is 75 degree beam (455Hz) I set angle up to 40 degree, if it is 45 degree beam (800Hz) I set angle up to 25 degree. Also it depends on which images I am going to get: If I want to get SI as far as possible of boat - I increase angle, if I want to get more distinct DI - I decrease angle.

What is your mechanical system to get a good smooth, "non-jerking" sweep...??

Teflon on Teflon...?? Bearings...?? Gears...??

Rickie

Originally Posted by rnvinc

What is your mechanical system to get a good smooth, "non-jerking" sweep...??

Teflon on Teflon...?? Bearings...?? Gears...??

Rickie

Unfortunally none of them . One year ago, before publishing this, I suggested Humminbird to manufacture proper mechanism on that idea, but they said that they have a lot of their own ideas for 5 years ahead. I wrote the same to Lowrance then – they did not reply at all

If you're just creating the "sweep" by holding the cable...you're doing an amazing job of a fluid sweep...

You're images show no jumping or jerking at all...

I see you are in Alaska...is that your homeland...??

Rickie