h
> LF39
> Port Orchard YC, WA.
>
>
>
> Original message ----
> From: Ron Ricci via CnC-List
> Date: 9/14/18 10:22 (GMT-08:00)
> To: cnc-list@cnc-list.com
> Cc: Ron Ricci
> Subject: Re: Stus-List padwheel analogue thru hull device
>
>
> ron.ri...@1968.usna.com
From: Doug Mountjoy [mailto:svrebeccal...@gmail.com]
Sent: Friday, September 14, 2018 3:23 PM
To: cnc-list@cnc-list.com
Cc: Ron Ricci
Subject: Re: Stus-List padwheel analogue thru hull device
Ron,
Does your speed sensor shoot through the hull? If so what
Fred Thanks for info.
Doug Mountjoy Rebecca Leah LF39 Port Orchard YC, WA.
Original message From: Frederick G Street via CnC-List
Date: 9/14/18 12:46 (GMT-08:00) To:
cnc-list@cnc-list.com Cc: Frederick G Street Subject: Re:
Stus-List padwheel analogue thru hull device
Doug — as far as I know, the ultrasonic speed sensors need to be through-hull,
as they work by detecting particles in the water and using Doppler shift to
gauge the speed. So they wouldn’t work in-hull.
— Fred
Fred Street -- Minneapolis
S/V Oceanis (1979 C&C Landfall 38) -- Bayfield, WI
> On
:
Stus-List padwheel analogue thru hull device
I have an Airmar ultrasonic speed sensor. It accurately gives speed readings
through water to 0.1 knots. GPS gives speed over ground and isn't as
responsive as sensor. Ron RicciPatriot
On Fri, Sep 14, 2018, 1:09 PM James Bibb via CnC-List
Hi Dan
I believe most current model speed instruments measure boat speed thru the
water using paddle wheels. I know Raymarine does. The Raymarine i50/i60 tri
pack that we purchased in 2014 uses a paddlewheel transducer for speed.
As others have said Boat Speed is very important for sail trim.
I have an Airmar ultrasonic speed sensor. It accurately gives speed
readings through water to 0.1 knots. GPS gives speed over ground and isn't
as responsive as sensor.
Ron Ricci
Patriot
On Fri, Sep 14, 2018, 1:09 PM James Bibb via CnC-List
wrote:
> Good question.
>
> I believe that it measures
Good question.
I believe that it measures speed of the boat instead of speed over ground which
is helpful when you are trying to judge movement and sail trim versus how fast
the tide could be moving the boat.
I know there are other sensors now that measure without the paddle.
> On Sep 14
