Hi Cap'n Phil,

In general doubling the output power will increase the depth performance by 41%. To double the depth performance would require a fourfold increase in output power, all else being equal.

The transducer will require clear unaerated (no bubbles) water. If air bubbles are flowing past the face of the transducer it will very badly degrade the performance. Fairing blocks are not required for all transducers - it depends on the shape of that part of the transducer that's in the water. If the source of air bubbles is some other protrusion (like a thru hull fitting in front of the depth transducer) then a fairing block is unlikely to help.

--
Best Regards,

Bert van den Berg
CruzPro Ltd.
www.cruzpro.com
35 Keeling Road, #A4
Henderson 1008
New Zealand

Tel: 64-9-838-3331
Fax: 64-9-838-3332


wrote in message ...
Good day all

One newbie here needs a bit of help regarding sounder
wattage. All other variables being equal, how much
advantage is a 1KW (Tru The Hull) sounder over a similar
500 watt model?

A second question is how much will a fairing block
improve the display? The assumption is it will provide a
more stable picture at higher speeds. I boat in Alaska
where 1000 foot depths can occur as little as three
quarters of a mile from shore. Thanks - Cap'n Phil