Transponder dimensions

[gdallas]

I want to install depth and log in my boat, which is planked in 1" mahogany. All the instruments I can find use transponders with an outside diameter of 51mm. Given the deadrise angle, this will mean a rather large fairing block.....Does anyone know of a make that uses narrower diameter transponders?

Thank you

Graham

[BFR]

Humminbird have a unit smaller than 52mm but it's a plastic.... Navman or north star use a 42 mm atleast in NZ they do but again thats plastic and you should probably use bronze otherwise you run the risk of cracking a plastic unit as the boat swells.

for your depth it's not the best but there is the inhull option.... useing a puck transducer or a thru hull in a oil bath.... as for the speed.... I have seen a sped unit designed for sailing dinghys and windsurfers that had no thru hull but a paddle wheel that was attached to the exterior and had a pick up inside the boat.... I can't remember the brand.

Tacktick might have a solution.

[kc8pql]

...for your depth it's not the best but there is the inhull option.... useing a puck transducer or a thru hull in a oil bath....

This works fine in a solid fiberglass hull but it won't work through wood, which absorbs the signal.

Here's a link to the Airmar site. Airmar is the OEM for almost all the transducers used by the major manufactures. You may find something there.
http://www.airmar.com/Product_Catalog/marine_catalog/thru_hull/thcat_index.html