We do a lot more cruising than racing, so while I appreciate the value of 
these goodies, I would rather spend my boat bucks on other things. I may 
eventually put in a N2K backbone, however at least initially I can get by 
without it. I have already integrated my Standard Horizon VHF/AIS receiver via 
0183 and the sonar/depth/temp can plug directly in without N2K. I don't see the 
need for the fancy sonar, in truth any sonar but Garmin seems to almost throw 
it in for free so why not?
Cheers,Doug
    On Wednesday, October 30, 2019, 09:55:02 a.m. EDT, Josh Muckley via 
CnC-List <cnc-list@cnc-list.com> wrote:  
 
 Don't forget that the boat speed also feeds into the wind instrument as it 
calculates true wind speed and direction.  I find this helpful for planning 
sail sets and anticipating the differences at different points of sail.  You 
can compare true wind conditions to the poplars of your boat.  If you get fancy 
and feed the true wind into a polar computer or some newer chartplotters like 
the b&g zeus, they will tell you when to tack, target speed, and give you 
laylines.  Cool stuff but obviously getting a bit removed from the purist's 
sailing.
That's good to know about the troubles with a thru-hull depth sounder.  What 
about fancy forward scan and side scan.  Consider those?  You are going with 
N2K right? 
Josh Muckley S/V Sea Hawk 1989 C&C 37+Solomons, MD 
On Wed, Oct 30, 2019, 9:43 AM Doug Welch via CnC-List <cnc-list@cnc-list.com> 
wrote:

 Thanks Josh,      I am doing the work over the winter layup in Toronto so days 
above 5 degrees that epoxy requires to cure can be few and far between. I am 
hoping to skip filling the existing hole with thickened epoxy by using an 
appropriately sized plug on the hold saw.  To answer your questions, I am just 
going with temp and depth as it's simpler, less expensive and gives me sonar on 
the same transducer. I know having a speed transducer is useful for determining 
current, however I would rather have the sonar (for anchoring not fishing). A 
friend has a shoot through the hull depth transducer on his boat and it seems 
very flakey. He sails in Georgian Bay where shoals and rocks abound, his 
transducer always seems to give up when we need it most.

Cheers,
Doug

    On Wednesday, October 30, 2019, 09:23:59 a.m. EDT, Josh Muckley via 
CnC-List <cnc-list@cnc-list.com> wrote:  
 
 As I understand it, that location forward of the keel was expected by the 
designers to be the location for the speed and depth transducers.  As such the 
hull is solid in that location.  
If you drill it out and find otherwise then a typical removing of the core 
while leaving the inner and outer skins in place would be appropriate.  Dig the 
core back as far as possible.  With a 52mm hole, angling a drill bit and other 
various implements should be pretty easy.  Back fill the cavity with thickened 
epoxy, allow to cure, and redrill the 52mm hole as needed.  Install the 
transducer with 5200.
You will most likely find that the original was bedded with 5200 and will not 
come free.  There are products available that are supposed to loosen/weaken 
5200.  Try them first but it may still take days of soaking.  If that fails 
then a sanding drum on a drill can make pretty short work of the plastic and 
5200.  For the new hole, a hole saw typically needs the drill bit to center and 
stabilize the drum but with a 32mm hole already there it can be difficult.  
Create a stabilizing core by getting a hole saw that fits the existing hole 
(either in the hull or in the existing transducer fitting) and drill a plug 
from a 2x4.  Now change the saw to your 52mm and slide the wood plug over the 
drill bit.  The plug will act as a centering guide as you drill the new hole.  
Depending on the size of the old fittings this may be sufficient and 
pre-removal may be unnecessary.
I find biological growth to fowl my speedwheel constantly during the summer 
months.  I'm frequently removing the speedwheel with the boat in the water 
resulting in a small geyser.  To avoid this I am seriously considering an 
ultrasonic speed sensor.  Have you considered this yourself?  I would like even 
more if I could find one that was able to be glued to the inner hull and simply 
shoot through.  I know some depth transducers are made this way but speed is a 
different story.
Josh Muckley S/V Sea Hawk 1989 C&C 37+Solomons, MD


On Wed, Oct 30, 2019, 8:55 AM Doug Welch via CnC-List <cnc-list@cnc-list.com> 
wrote:

It's time to replace the B and G Network Quad instruments on my 33-2. This 
means replacing the old 32 mm paddle wheel speed transducer with a 52 mm airmar 
transducer. I understand that the 33-2 is partially cored hull, so my question 
is the area where the transducers are currently located cored. They are located 
in the locker at the foot of the vberth. Any other advice on removing the old 
and installing the new is gratefully received. I went with a Garmin Echomap 
plus cv75 and sonar,depth, temperature transducer.

Cheers,Doug WelchCeltic Knot 33-2 c/b 
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